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Photocatalytic degradation of Rhodamine B in aqueous phase by bimetallic metal-organic framework M/Fe-MOF (M = Co, Cu, and Mg)

  • Thi Kim Ngan Tran , Huu Loc Ho , Huu Vinh Nguyen , Bich Thuy Tran , Trung Thanh Nguyen , Phuong Quynh Thi Bui and Long Giang Bach EMAIL logo
Published/Copyright: January 26, 2022
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Open Chemistry
From the journal Open Chemistry Volume 20 Issue 1

Abstract

Bimetallic metal-organic frameworks (MOFs) exhibit outstanding performance in a wide range of applications, including gas catalysis, adsorption, and luminescence sensor. The structure and properties of materials can be designed based on the variation of different metal ions, so this MOFs material system has unique properties. In this study, M/Fe-MOF bimetallic materials (M = Co, Cu, and Mg) were synthesized by solvothermal method and evaluated for photocatalytic activity in the degradation reaction of rhodamine B (RhB) organic pigments. The as-synthesized materials were characterized by using several physicochemical methods such as X-ray diffraction, fourier transform infrared spectroscopy (FT-IR), ultraviolet-visible spectroscopy (UV-Vis), Brunauer–Emmett–Teller (BET), scanning electron microscopy (SEM), and UV-Vis diffuse reflectance spectra. The results show that the Co/Fe-MOF, Cu/Fe-MOF, and Mg/MOF materials have uniform grain grade, high crystallinity, with the surface area of 26.1, 25.9, and 25.9 m2/g, respectively. When modified with Co, Cu, and Mg, the crystal structure of Fe-MOF materials was unchanged, and all metal ions are inserted inside the structure of the material, as well as replacing Fe ions in the lattice crystals. At the same time, the modification also increases the light absorption in the visible light region and gives a high photocatalytic degradation of RhB organic pigments under visible light in the range of 85–92%.

Keywords: bimetallic metal-organic framework; photocatalytic degradation; rhodamine B; solvothermal

1 Introduction

Currently, the concern for the development of the community is the problem of water pollution by dyes and pigments. The removal of dyes from wastewater has become a major research direction in the field of water pollution treatment. Moreover, the molecules of many dyes are very stable, are not degraded by light, chemical, biological, and other agents, and can affect human health [1,2]. The degradation of dyes by biological methods is usually very low because biological treatment methods are not effective. Wastewater containing high concentrations of dyes is usually treated by physical or chemical methods [3,4]. Currently, heterogeneous photocatalysis, which occurs when a catalyst is irradiated with a photon of light with an energy higher than the bandgap energy (Eg) of that photocatalyst, is considered an effective green method to treat wastewater containing organic matter [5,6,7,8,9].

Recently, the incorporation of second metal ions into the nodes of the framework for the synthesis of bimetallic metal-organic frameworks (MOFs) has been proposed to enhance the catalytic, electronic, and luminescent properties [5,10,11,12,13,14]. To form bimetallic MOFs, improve structural stability, and improve performance, conventional MOFs integrate two different metal ions into the same lattice structure [15]. Bimetallic MOFs have wide applications compared to single-metal MOFs, especially in gas sensing, separation and storage, drug delivery, and catalysis. Therefore, different Fe-based MOFs modification techniques have been used to narrow the bandgap energy (Eg) by doping metals (Co, Cu, Ni, Mn, Sn, Pt, etc.) onto Fe-MOF to bring the activity of photocatalytic materials to the visible light region [16,17,18].

A recent study by the Gu group [19] investigated the influence of the Mg2+/Fe3+ ratio on the crystal formation of the MIL-88B(Fe) material structure, and its application in removing arsenic needles in wastewater. In 2018, Nguyen Huu Vinh and the research team successfully prepared a MOF-based Ni/Fe mixture with different molar ratios of Ni2+/Fe3+ through the heat capacity method. The results indicate that the Ni/Fe-MOF samples obtained based on the evaluation of the color photochemical degradation of rhodamine B (RhB) dye showed a high photocatalytic activity compared with MIL-53(Fe). The decomposition rate of Ni/Fe-MOF-0.3 can reach the highest level (91.14%) after 180 min of visible light irradiation [20]. A recent study, in 2019, by Chengdong Yang’s research group has successfully synthesized and modified NH2-MIL-88B(Fe) into porous carbon nanomaterials. The postsynthesized material is applied in the field of catalyzing the degradation of bisphenol A, methylene blue, and tetracycline [21].

In 2020, the Hong-Tham T. Nguyen research group used microwave-assisted method to successfully synthesize MIL-88B(Fe) and the Al/Fe bimetallic framework (Al/Fe-MOF). The Fenton photodegradation of RhB under visible light irradiation was carried out in the presence of the synthesized samples as an efficient catalyst. Al/Fe-MOF catalyst degrades more than 96% RhB in up to 120 min [22]. Most of the synthesis of MOFs is carried out by hydrothermal or solvent-thermal methods, based on the change of the polar solvent combined with the appropriate temperature. Specifically, a mixture of ligands and metal salts dissolved in a solvent (or mixture of solvents) is heated less than 300°C for 8–48 h to grow crystals [23]. By solvent and hydrothermal methods, it is possible to synthesize MOFs with high crystalline strength to determine the structure. However, these methods also have limitations such as long reaction times, limited large-scale synthesis, and high error; other alternative synthesis processes have been investigated, such as support microwave, electrochemical, sonication, and mechanical ball milling [24]. But these methods cannot yield crystals of sufficient quality for structure determination compared with solvent and hydrothermal methods. In addition, the synthesis of materials by solvent and hydrothermal methods is simple, the morphology of crystals can be controlled by changing the synthesis conditions, and is less expensive. However, based on the characterization of the modified material with crystal structure and controlled crystal size, it exhibits superior photochemical and adsorption activity.

In addition, earlier domestic studies have not focused on the synthesis of structural modifications of Fe-MOF with Co2+, Cu2+, and Mg2+ ions and their application in photochemical reactions for the degradation of harmful substances under the influence of sunlight or visible light. However, metal ion doping increases its luminescence to the visible light region of the catalyst surface and reduces the bandgap energy, increasing the photocatalytic activity.

Therefore, the main objective of this study is to synthesize and determine the characteristic properties of Fe-MOF-based bimetallic materials with Co2+, Cu2+, and Mg2+ by using solvothermal method. At the same time, studying the structural, morphological, and physicochemical properties of the composites determined by physicochemical methods such as X-ray diffraction (XRD), FT-IR, UV-Vis, SEM, BET, and UV-Vis diffuse reflectance spectra (DRS). Specifically, the efficiency of the material is applied in a photocatalytic reaction that decomposes RhB dye under visible light.

2 Material and methods

2.1 Materials

Metal salts include iron(iii) nitrate nonahydrate, Fe(NO3)3·9H2O (98.5%, China); copper(ii) nitrate trihydrate, Cu(NO3)2·3H2O (99%, China); cobalt nitrate hexahydrate, Co(NO3)2·6H2O (China 99%); and magnesium chloride, MgCl2·6H2O (China 99%). The solvents used were acetonitrile, CH3CN (Merck, Germany 99.5 %); terephthalic acid, H2BDC (Sigma Aldrich 98%); methanol, CH3OH (China); N,N-dimethylformamide, DMF (China 99.5%); and RhB, C28H31ClN2O3 (Sigma Aldrich).

2.2 Preparation of M/Fe-MOF (M = Co, Cu, and Mg)

The bimetallic organic framework, M/Fe-MOF (M = Co, Cu, and Mg), was prepared by the solvothermal method, based on the synthesis process published in the earlier literature [25]. Fe(NO3)3·9H2O (0.1455 mmol), Co(NO3)2·6H2O (0.0145 mmol) and 1,4 benzene dicarboxylic acid (0.18 mmol) and 40 mL DMF. Next, 40 mL of CH3CN was added with stirring at room temperature to form a transparent solution. The mixture was then placed in a 100 mL Teflon flask and transferred to a reactor heated at 150°C for 12 h. After cooling, the precipitate was collected by centrifugation. To remove impurities, the material was washed three more times with DMF and three times with methanol. Finally, the product was dried at 150°C under a vacuum. The synthesis processes of Cu/Fe-MOF and Mg/Fe-MOF materials are similar to that of Co/Fe-MOF.

2.3 Characterization of catalyst

The determination of the presence of functional groups present in the material is based on analytical method FT-IR infrared spectroscopy recorded in the range of 500–4,000/cm was measured on Nicolet 6700 – Thermo Fisher Scientific (USA). The crystalline phase composition of the material was determined based on the XRD method and measured on a D8 Advanced – Hitachi (Germany) instrument using Cu Kα radiation (λ = 1.54188 Å). The UV-Vis DRS diffuse reflectance spectroscopy method was measured on a Shimazu UV-2450 instrument with wavelengths from 200 to 800 nm. The surface morphology and particle size of the samples were investigated through SEM images by the device S4800 – JEOL (Japan). Specific surface and capillary characteristics of porous materials were determined by nitrogen adsorption–desorption isotherms on Micromeritics 2020 – Micromeritics, USA. The UV-Vis visible and ultraviolet absorption spectroscopy methods were used to determine the concentration of the pigment solution during the photocatalytic activity test of the materials recorded on a UV-Vis visible spectrometer (Aligent Cary 60, Malaysia).

2.4 Catalytic activity test

The process of evaluating the photocatalytic activity of the synthesized materials was carried out based on the ability to decompose RhB pigments with a light source of 40 W LED, with a distance of 15 cm between the light source and the RhB solution. The reaction solution mixture consisted of 5 mg of catalyst material dispersed in 100 mL of RhB solution at a concentration of 3.10−5 M, 1 mL of a 1 mM H2O2 solution in a 250 mL (Jacket Glass Beaker-NANSHIN-China) heat-resistant reaction beaker under visible light. Each spout at the top and bottom of the beaker is used to connect flexible hoses that allow water to pass through to cool the reaction system. The mixture was stirred in the dark for 1 h so that the adsorption–desorption process reached equilibrium. During illumination, 4 mL was removed from the reaction system at intervals of 120 min. After taking out, the samples were centrifuged at 6,000 rpm for 10 min to completely remove the solids.

3 Results and discussion

The XRD patterns of these materials are shown in Figure 1. All samples show similar XRD patterns, which is consistent with the topology of Fe-MOF. Notably, compared with Fe-MOFs, the XRD patterns of M/Fe-MOF shift toward higher angles at 11.42°, whereas at 19.38°, they shift toward lower angles. This observation is generally consistent with earlier reports, based on the breathing effect and flexibility of the Fe-based MOF structure, where simultaneous displacements occur from lower and higher angles in both directions [26]. Partial replacement of Fe3+ ions with other divalent metal ions (M2+) will lead to a slight decrease in the Fe–O bond length and a slight increase in the Fe–O–Fe angle, which is explained. Correspondingly, the parameters and unit cell volume of the formed MOFs are influenced by the change of the diffraction peaks.

Figure 1 XRD patterns of M/Fe-MOF (M = Co, Cu, and Mg).
Figure 1

XRD patterns of M/Fe-MOF (M = Co, Cu, and Mg).

FT-IR spectra were used to determine the bonds in CoFe-MOF, CuFe-MOF, and MgFe-MOF materials in the wavenumber region from 500 to 4,000 cm−1 and obtained the results as shown in Figure 2. FTIR spectra appear that the peak oscillation peak at about 3108.7 cm−1 is the oscillation of the O–H bond of the water molecules absorbed on the surface of the material. In addition, the peak at 750.1 cm–1, due to fluctuations in the C–H bonds of the BDC ligands. The presence of valence vibrations (Fe–O) at 552.5 cm−1 indicates the formation of a metal–oxo bond between the carboxylic group of terephthalic acid and Fe(iii). For Fe-MOF, the oscillation of the central oxygen in the Fe3O cluster combines with the D3h symmetry to produce adsorption that peaks around 613 cm–1. However, the symmetry is reduced from D3h to C2v when the iron present in the trinuclear metal cluster is displaced and replaced by another metal ion [27]. The change of metal ions in the lattice will lead to a change of the peak position, indicating successful coordination between different metal ions and binders. The above results demonstrated the formation of Fe-MOF structure in all materials and confirmed the successful synthesis of Fe2MO clusters in Fe2M-MOF.

Figure 2 FTIR spectra of M/Fe-MOF (M = Co, Cu, and Mg).
Figure 2

FTIR spectra of M/Fe-MOF (M = Co, Cu, and Mg).

The crystal shape, grain size, and grain distribution of the materials were observed through SEM images (Figure 3). When doping with other metal ions, in general, the morphology of the material is changed compared to the original Fe-MOF, the material has an octahedral crystal structure, and the crystal strength is quite high. The results show that Co/Fe-MOF and Cu/Fe-MOF, and Mg/Fe-MOF samples have uneven surface morphology, large particle size, unclear grain boundaries, and agglomeration of particles. These results also demonstrate the formation of Co/Fe-MOF, Cu/Fe-MOF, and Mg/Fe-MOF. The results are consistent with some previously published studies. Tang and Wang FE-SEM analysis, showed significant morphological changes in three Fe x Cu1−x (BDC) samples [28]. Compared with the Fe (BDC) and Cu (BDC) samples with the presence of octahedral microcrystals, Cu (BDC) samples have a cubic layered structure. The introduction of Cu into the Fe framework (BDC) causes the decomposition of the original octahedron into small irregular particles. With the change with increasing copper ratio in Fe x Cu1−x (BDC), the granular structure formed a scaly irregular structure and grew in a two-dimensional direction [28]. In which, the incorporation of the second metal element can affect the final morphology of Fe-MOF, which is completely consistent with previous reports [19].

Figure 3 SEM images of M/Fe-MOF (M = Co, Cu, and Mg).
Figure 3

SEM images of M/Fe-MOF (M = Co, Cu, and Mg).

The average capillary structure of the M/Fe-MOF bimetallic material was confirmed through the nitrogen adsorption–desorption isotherm (BET) study as shown in Figure 4. Nitrogen adsorption–desorption curves of type II (according to IUPAC classification) are typical for the presence of micro and medium capillary types. The specific surface area of BET has a difference between metal ions in Fe-MOF bimetallic materials, specifically Co/Fe-MOF (26.1 m2/g), Cu/Fe-MOF (25.9 m2/g), and Mg/Fe-MOF (28.6 m2/g). The corresponding specific surface area is increased by the incorporation of more light metals (Mg) in the Fe/Mg-Mil-88B bimetal. The results of research group Yue Gu (2018) showed that the specific surface area (BET) of Fe/Mg-MIL-88B at the ratios of 0.5, 1, and 2 was synthesized to be 360, 282, and 218 m2/g, respectively. It is noteworthy that the Fe-MIL-88B (57 m2/g) crystals have a markedly lower BET surface area than the Fe/Mg-MIL-88B(n) bimetallic structures [19].

Figure 4 N2 adsorption–desorption isotherms of M/Fe-MOF (M = Co, Cu, and Mg): (a) Fe-MOF, (b) Co/Fe-MOF, (c) Cu/Fe-MOF, and (d) Mg/Fe-MOF.
Figure 4

N2 adsorption–desorption isotherms of M/Fe-MOF (M = Co, Cu, and Mg): (a) Fe-MOF, (b) Co/Fe-MOF, (c) Cu/Fe-MOF, and (d) Mg/Fe-MOF.

The inclusion of the secondary metal in the Fe-MOF framework is beneficial to promote full contact of the active sites of the resulting bimetallic M/Fe-MOF. Furthermore, the pore volume and specific surface area tend to increase with the M/Fe molar ratio. The results of this study are similar to the study reported by Jiao et al. on Mg/Ni-MOF-74, in which the BET surface area decreased when replacing heavier transition metal [29].

Dang et al. evaluated the specific surface area of Fe/Co-MOF materials. The N2 adsorption–desorption isotherms of Co-MOFs, Fe-MOFs, and MFC-MOFs (1:3) showed type IV isotherms [17]. Compared to the BET surface of 47.8 and 7.8 m2/g for Fe-MOF and Co-MOF alone, MFC-MOF (1:3) actually possesses a significantly larger BET surface area of 215.6 m2/g [17]. Tang and Wang also showed that with the increasing proportion of copper in the bimetal due to the collapsing of nanoholes due to Cu incorporation, a change in pore size distribution can be observed from microparticles (<2 nm) to medium particles (2–50 nm) in FexCu1−x (BDC) [28]. The measured BET surface area of Fe (BDC) was 715.8 m2/g, decreasing to 264.9 m2/g for Fe0.80Cu0.20 (BDC), 219.4 m2/g for Fe0.75Cu0.25 (BDC), and 52.6 m2/g for Fe0.67Cu0.33 (BDC), respectively [28].

The light absorption ability in the long-wavelength region (visible light region) of the catalyst samples was studied through solid UV-Vis spectroscopy. Figure 5 shows that the solid UV-Vis spectrum measured in the wavelength range of 200–1,400 nm shows that the bimetallic samples have a strong absorption range in the wavelength region from 200 to 400 nm.

Figure 5 (a) UV-Vis diffuse reflectance spectra (UV-Vis DRS) and (b) bandgap energies (Eg) of M/Fe-MOF (M = Co, Cu, and Mg).
Figure 5

(a) UV-Vis diffuse reflectance spectra (UV-Vis DRS) and (b) bandgap energies (Eg) of M/Fe-MOF (M = Co, Cu, and Mg).

The bandgap energy (Eg) of M/Fe-MOF materials synthesized by the solvothermal method is 2.42 eV (Mg/Fe-MOF), 2.3 eV (Cu/Fe-MOF), and 2.32 eV (Co/Fe-MOF). Moreover, the presence of the second metal helps to disperse the Fe-MOF crystals evenly, creating small-sized particles, and the second metal has a very important role in receiving electrons from the conduction band of the metal. MOFs photocatalysts, reducing and limiting the recombination between electrons and holes h+, effectively increase the catalytic activity as well as the catalytic stability.

The photocatalytic activity of three bimetallic samples M/Fe-MOF (M = Co, Cu, and Mg) was investigated through the photochemical degradation of RhB in the presence of H2O2. The photocatalytic results of the modified materials are presented in Figure 6. The decomposition efficiency is in the range of 85–92% after 120 min of light. The transformation of MOFs depends on the influence of the central metal and the substitution metal, leading to a different photocatalytic performance. The relation of characterization results includes surface area, bandgap energy, and catalytic activity. The metal ion doping reduces the energy of the semiconductor region of the material, prevents the recombination of the e− and h+ pairs, and thereby increases the impact performance of the material. In addition, the M/Fe metal frame consists of Fe2MO metal clusters (M = Co, Cu, Mg) with a higher pore diameter and specific surface area than the Fe monocentric metal framework. Therefore, M/Fe-MOF exhibits high photocatalytic activity in RhB degradation. Ding et al. showed that the degradation of tetrabromobisphenol A by CuFe2O4 magnetic nanoparticles exhibits high catalytic efficiency for peroxymonosulfate (PMS) [30]. In a recent publication, Chen et al. conducted the synthesis of Co/Fe bimetal oxide to degrade norfloxacin by PMS activation, with a 100% degradation rate under optical conditions [31]. In addition, Ren et al. showed that other bimetallic oxides MFe2O4 (M ¼ Cu, Co, Zn, and Mn) are also good heterogeneous catalysts of PMS [32]. In general, the expression of novel properties through mutual enhancement or modification is due to the synergistic advantage of the individual components of multicomponent catalysts. Therefore, the potential discovery of new bimetallic organic frameworks has become a new research direction with many potential applications. For example, El-sharkawy et al. prepared bimetallic organic frameworks and used them to catalyze the oxidation color degradation of Acid-Blue 92 in the presence of H2O2 [33]. In a recent publication, Li et al. showed that the catalytic activity of Fe/Co-MOF in 15 min removes almost 100% of methyl blue (MB) by the unsaturated metal active site of Fe(ii), and Co(ii) contributes to the generation of sulfate ( SO 4 ˙ − ) and hydroxyl ( OH ˙ ) radicals, improving the ability to degrade MB [18].

Figure 6 (a) Photodegradation of RhB, (b) UV-Vis spectral of RhB of Co/Fe-MOF, (c) Cu/Fe-MOF, and (d) và Mg/Fe-MOF.
Figure 6

(a) Photodegradation of RhB, (b) UV-Vis spectral of RhB of Co/Fe-MOF, (c) Cu/Fe-MOF, and (d) và Mg/Fe-MOF.

Under the influence of visible light, photocatalysis took place in the presence of bimetallic materials M/Fe-MOF (M = Co, Cu, and Mg) in the RhB colorant solution, the electrons (e) jump from highest occupied molecular orbital to lowest unoccupied molecular orbital creating electrons (e−) and holes (h+). The second metal ion doping has a very important role to accept electrons from the conduction band of MOF photocatalysts, reducing and limiting the recombination ability between electrons (e−) and holes (h+), and the efficiency is to increase the catalytic activity and catalytic stability. Hole (h+) reacts with H2O to generate free radicals OH ˙ and e− reacts with O2 to produce free radicals O 2 ˙ − . These free radicals have a high reducing potential, which is capable of oxidizing RhB, which thoroughly processes pollutants into CO2 and H2O. Due to the synergistic effect of O 2 ˙ − , OH ˙ radicals, RhB is broken into many pieces. The final products will be completely decomposed to produce CO2, H2O, and other small organic acids. Besides, the presence of H2O2 is evaluated as a better electron acceptor than O2, preventing the recombination of the e− and h+ pairs. Besides, H2O2 is a hydrophilic substance, in contact with the hydroxylated M/Fe-MOF particles, while retaining the e− photochemical process, accelerating the oxidation of organic compounds [34].

In addition, the photocatalytic degradation of RhB shown in Figure 7 shows the corresponding pseudo-first-order kinetics by the following equation:

(1) − ln ( C / C 0 ) = k t ,

where C 0 and C are the concentrations of RhB in solution at the initial concentrations of RhB and the concentrations of RhB at time t, respectively, the value of k is the apparent first-order rate constant. According to the equation, the RhB degradation rate is calculated as 0.01508/min (Fe-MOF), 0.01786/min (Cu/Fe-MOF), 0.01831/min (Mg/Fe-MOF), and 0.02257/min (Co/Fe-MOF). The results show that when doping the second metal ion into the lattice framework, the pseudo-first-order rate constant is higher than that of the single-metal MOF sample.

Figure 7 Kinetics study of photocatalytic RhB degradation using of M/Fe-MOF (M = Co, Cu, and Mg) catalyst.
Figure 7

Kinetics study of photocatalytic RhB degradation using of M/Fe-MOF (M = Co, Cu, and Mg) catalyst.

4 Conclusion

In this study, M/Fe-MOF materials modified with Co, Cu, and Mg were synthesized by solvothermal method. When Fe-MOF is modified with Co, Cu, and Mg, the resulting material has a specific surface area and pore volume as follows: Co/Fe-MOF (26.1 m2/g and 8.2 nm), Cu/Fe-MOF (25.9 m2/g and 9.26 nm), and Mg/Fe-MOF (28.6 m2/g and 1.52 nm). Moreover, the M/Fe-MOF material has a low band gap of 2.3–2.42 eV, which is favorable for sunlight absorption and might confer improved catalytic activity. In photocatalytic experiment against RhB dyes in aqueous media, M/Fe-MOF materials exhibited high photocatalytic ability, which achieved about 85–92% conversion after 120 min of reaction. The present results open up the potential and application of Fe-MOF bimetallic materials in the field of heterogeneous photocatalysis for environmental treatment.

Acknowledgments

This research is funded by Vietnam National Foundation for Science and Technology Development (NAFOSTED) under the grant number 104.05-2018.336.

  1. Author contributions: Writing-original draft preparation, Thi Kim Ngan Tran.; software, Huu Loc Ho; data curation, Huu Vinh Nguyen; conceptualization, Bich Thuy Tran; and methodology, Trung Thanh Nguyen; formal analysis, Phuong Quynh Thi Bui; and writing-review and editing, Long Giang Bach. All authors have read and agreed to the published version of the manuscript. We thank Ngo Thi Cam Quyen, Nguyen Thi Hong Tham, Nguyen Duy Trinh, Vo Nguyen Dai Viet, Nguyen Tra Mi, Tran Van Thuan, and Lam Van Tan at Nguyen Tat Thanh University for their assistance with this study.

  2. Conflict of interest: The authors declare no conflict of interest.

  3. Ethical approval: The conducted research is not related to either human or animal use.

  4. Data availability statement: All the data is available within the manuscript.

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Received: 2021-08-24
Revised: 2021-11-21
Accepted: 2021-11-24
Published Online: 2022-01-26

© 2022 Thi Kim Ngan Tran et al., published by De Gruyter

This work is licensed under the Creative Commons Attribution 4.0 International License.

Articles in the same Issue

  1. Regular Articles
  2. Photocatalytic degradation of Rhodamine B in aqueous phase by bimetallic metal-organic framework M/Fe-MOF (M = Co, Cu, and Mg)
  3. Assessment of using electronic portal imaging device for analysing bolus material utilised in radiation therapy
  4. A detailed investigation on highly dense CuZr bulk metallic glasses for shielding purposes
  5. Simulation of gamma-ray shielding properties for materials of medical interest
  6. Environmental impact assesment regulation applications and their analysis in Turkey
  7. Sample age effect on parameters of dynamic nuclear polarization in certain difluorobenzen isomers/MC800 asphaltene suspensions
  8. Passenger demand forecasting for railway systems
  9. Design of a Robust sliding mode controller for bioreactor cultures in overflow metabolism via an interdisciplinary approach
  10. Gamma, neutron, and heavy charged ion shielding properties of Er3+-doped and Sm3+-doped zinc borate glasses
  11. Bridging chiral de-tert-butylcalix[4]arenes: Optical resolution based on column chromatography and structural characterization
  12. Petrology and geochemistry of multiphase post-granitic dikes: A case study from the Gabal Serbal area, Southwestern Sinai, Egypt
  13. Comparison of the yield and purity of plasma exosomes extracted by ultracentrifugation, precipitation, and membrane-based approaches
  14. Bioactive triterpenoids from Indonesian medicinal plant Syzygium aqueum
  15. Investigation of the effects of machining parameters on surface integrity in micromachining
  16. The mesoporous aluminosilicate application as support for bifunctional catalysts for n-hexadecane hydroconversion
  17. Gamma-ray shielding properties of Nd2O3-added iron–boron–phosphate-based composites
  18. Numerical investigation on perforated sheet metals under tension loading
  19. Statistical analysis on the radiological assessment and geochemical studies of granite rocks in the north of Um Taghir area, Eastern Desert, Egypt
  20. Two new polypodane-type bicyclic triterpenoids from mastic
  21. Structural, physical, and mechanical properties of the TiO2 added hydroxyapatite composites
  22. Tribological properties and characterization of borided Co–Mg alloys
  23. Studies on Anemone nemorosa L. extracts; polyphenols profile, antioxidant activity, and effects on Caco-2 cells by in vitro and in silico studies
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  25. Cyclic connectivity index of bipolar fuzzy incidence graph
  26. The role of passage numbers of donor cells in the development of Arabian Oryx – Cow interspecific somatic cell nuclear transfer embryos
  27. Mechanical property evaluation of tellurite–germanate glasses and comparison of their radiation-shielding characteristics using EPICS2017 to other glass systems
  28. Molecular screening of ionic liquids for CO2 absorption and molecular dynamic simulation
  29. Microwave-assisted preparation of Ag/Fe magnetic biochar from clivia leaves for adsorbing daptomycin antibiotics
  30. Iminodisuccinic acid enhances antioxidant and mineral element accumulation in young leaves of Ziziphus jujuba
  31. Cytotoxic activity of guaiane-type sesquiterpene lactone (deoxycynaropicrin) isolated from the leaves of Centaurothamnus maximus
  32. Effects of welding parameters on the angular distortion of welded steel plates
  33. Simulation of a reactor considering the Stamicarbon, Snamprogetti, and Toyo patents for obtaining urea
  34. Effect of different ramie (Boehmeria nivea L. Gaud) cultivars on the adsorption of heavy metal ions cadmium and lead in the remediation of contaminated farmland soils
  35. Impact of a live bacterial-based direct-fed microbial (DFM) postpartum and weaning system on performance, mortality, and health of Najdi lambs
  36. Anti-tumor effect of liposomes containing extracted Murrayafoline A against liver cancer cells in 2D and 3D cultured models
  37. Physicochemical properties and some mineral concentration of milk samples from different animals and altitudes
  38. Copper(ii) complexes supported by modified azo-based ligands: Nucleic acid binding and molecular docking studies
  39. Diagnostic and therapeutic radioisotopes in nuclear medicine: Determination of gamma-ray transmission factors and safety competencies of high-dense and transparent glassy shields
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  45. Texturing of nanocoatings for surface acoustic wave-based sensors for volatile organic compounds
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https://doi.org/10.1515/chem-2021-0110
Keywords for this article
bimetallic metal-organic framework; photocatalytic degradation; rhodamine B; solvothermal
Creative Commons
BY 4.0

Articles in the same Issue

  1. Regular Articles
  2. Photocatalytic degradation of Rhodamine B in aqueous phase by bimetallic metal-organic framework M/Fe-MOF (M = Co, Cu, and Mg)
  3. Assessment of using electronic portal imaging device for analysing bolus material utilised in radiation therapy
  4. A detailed investigation on highly dense CuZr bulk metallic glasses for shielding purposes
  5. Simulation of gamma-ray shielding properties for materials of medical interest
  6. Environmental impact assesment regulation applications and their analysis in Turkey
  7. Sample age effect on parameters of dynamic nuclear polarization in certain difluorobenzen isomers/MC800 asphaltene suspensions
  8. Passenger demand forecasting for railway systems
  9. Design of a Robust sliding mode controller for bioreactor cultures in overflow metabolism via an interdisciplinary approach
  10. Gamma, neutron, and heavy charged ion shielding properties of Er3+-doped and Sm3+-doped zinc borate glasses
  11. Bridging chiral de-tert-butylcalix[4]arenes: Optical resolution based on column chromatography and structural characterization
  12. Petrology and geochemistry of multiphase post-granitic dikes: A case study from the Gabal Serbal area, Southwestern Sinai, Egypt
  13. Comparison of the yield and purity of plasma exosomes extracted by ultracentrifugation, precipitation, and membrane-based approaches
  14. Bioactive triterpenoids from Indonesian medicinal plant Syzygium aqueum
  15. Investigation of the effects of machining parameters on surface integrity in micromachining
  16. The mesoporous aluminosilicate application as support for bifunctional catalysts for n-hexadecane hydroconversion
  17. Gamma-ray shielding properties of Nd2O3-added iron–boron–phosphate-based composites
  18. Numerical investigation on perforated sheet metals under tension loading
  19. Statistical analysis on the radiological assessment and geochemical studies of granite rocks in the north of Um Taghir area, Eastern Desert, Egypt
  20. Two new polypodane-type bicyclic triterpenoids from mastic
  21. Structural, physical, and mechanical properties of the TiO2 added hydroxyapatite composites
  22. Tribological properties and characterization of borided Co–Mg alloys
  23. Studies on Anemone nemorosa L. extracts; polyphenols profile, antioxidant activity, and effects on Caco-2 cells by in vitro and in silico studies
  24. Mechanical properties, elastic moduli, transmission factors, and gamma-ray-shielding performances of Bi2O3–P2O5–B2O3–V2O5 quaternary glass system
  25. Cyclic connectivity index of bipolar fuzzy incidence graph
  26. The role of passage numbers of donor cells in the development of Arabian Oryx – Cow interspecific somatic cell nuclear transfer embryos
  27. Mechanical property evaluation of tellurite–germanate glasses and comparison of their radiation-shielding characteristics using EPICS2017 to other glass systems
  28. Molecular screening of ionic liquids for CO2 absorption and molecular dynamic simulation
  29. Microwave-assisted preparation of Ag/Fe magnetic biochar from clivia leaves for adsorbing daptomycin antibiotics
  30. Iminodisuccinic acid enhances antioxidant and mineral element accumulation in young leaves of Ziziphus jujuba
  31. Cytotoxic activity of guaiane-type sesquiterpene lactone (deoxycynaropicrin) isolated from the leaves of Centaurothamnus maximus
  32. Effects of welding parameters on the angular distortion of welded steel plates
  33. Simulation of a reactor considering the Stamicarbon, Snamprogetti, and Toyo patents for obtaining urea
  34. Effect of different ramie (Boehmeria nivea L. Gaud) cultivars on the adsorption of heavy metal ions cadmium and lead in the remediation of contaminated farmland soils
  35. Impact of a live bacterial-based direct-fed microbial (DFM) postpartum and weaning system on performance, mortality, and health of Najdi lambs
  36. Anti-tumor effect of liposomes containing extracted Murrayafoline A against liver cancer cells in 2D and 3D cultured models
  37. Physicochemical properties and some mineral concentration of milk samples from different animals and altitudes
  38. Copper(ii) complexes supported by modified azo-based ligands: Nucleic acid binding and molecular docking studies
  39. Diagnostic and therapeutic radioisotopes in nuclear medicine: Determination of gamma-ray transmission factors and safety competencies of high-dense and transparent glassy shields
  40. Calculation of NaI(Tl) detector efficiency using 226Ra, 232Th, and 40K radioisotopes: Three-phase Monte Carlo simulation study
  41. Isolation and identification of unstable components from Caesalpinia sappan by high-speed counter-current chromatography combined with preparative high-performance liquid chromatography
  42. Quantification of biomarkers and evaluation of antioxidant, anti-inflammatory, and cytotoxicity properties of Dodonaea viscosa grown in Saudi Arabia using HPTLC technique
  43. Characterization of the elastic modulus of ceramic–metal composites with physical and mechanical properties by ultrasonic technique
  44. GC-MS analysis of Vespa velutina auraria Smith and its anti-inflammatory and antioxidant activities in vitro
  45. Texturing of nanocoatings for surface acoustic wave-based sensors for volatile organic compounds
  46. Insights into the molecular basis of some chalcone analogues as potential inhibitors of Leishmania donovani: An integrated in silico and in vitro study
  47. (1R,2S,5R)-5-Methyl-2-(propan-2-yl)cyclohexyl 4-amino-3-phenylbutanoate hydrochloride: Synthesis and anticonvulsant activity
  48. On the relative extraction rates of colour compounds and caffeine during brewing, an investigation of tea over time and temperature
  49. Characterization of egg shell powder-doped ceramic–metal composites
  50. Rapeseed oil-based hippurate amide nanocomposite coating material for anticorrosive and antibacterial applications
  51. Chemically modified Teucrium polium (Lamiaceae) plant act as an effective adsorbent tool for potassium permanganate (KMnO4) in wastewater remediation
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  55. Mechanical and gamma-ray shielding examinations of Bi2O3–PbO–CdO–B2O3 glass system
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  58. Impact of benzimidazole functional groups on the n-doping properties of benzimidazole derivatives
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  60. Flexural strength and thermal properties of carbon black nanoparticle reinforced epoxy composites obtained from waste tires
  61. A focusing study on radioprotective and antioxidant effects of Annona muricata leaf extract in the circulation and liver tissue: Clinical and experimental studies
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  71. In vitro: Anti-coccidia activity of Calotropis procera leaf extract on Eimeria papillata oocysts sporulation and sporozoite
  72. Determination of oil composition of cowpea (Vigna unguiculata L.) seeds under influence of organic fertilizer forms
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  77. Ferrate synthesis using NaOCl and its application for dye removal
  78. Antioxidant, antidiabetic, and anticholinesterase potential of Chenopodium murale L. extracts using in vitro and in vivo approaches
  79. Study on essential oil, antioxidant activity, anti-human prostate cancer effects, and induction of apoptosis by Equisetum arvense
  80. Experimental study on turning machine with permanent magnetic cutting tool
  81. Numerical simulation and mathematical modeling of the casting process for pearlitic spheroidal graphite cast iron
  82. Design, synthesis, and cytotoxicity evaluation of novel thiophene, pyrimidine, pyridazine, and pyridine: Griseofulvin heterocyclic extension derivatives
  83. Isolation and identification of promising antibiotic-producing bacteria
  84. Ultrasonic-induced reversible blood–brain barrier opening: Safety evaluation into the cellular level
  85. Evaluation of phytochemical and antioxidant potential of various extracts from traditionally used medicinal plants of Pakistan
  86. Effect of calcium lactate in standard diet on selected markers of oxidative stress and inflammation in ovariectomized rats
  87. Identification of crucial salivary proteins/genes and pathways involved in pathogenesis of temporomandibular disorders
  88. Zirconium-modified attapulgite was used for removing of Cr(vi) in aqueous solution
  89. The stress distribution of different types of restorative materials in primary molar
  90. Reducing surface heat loss in steam boilers
  91. Deformation behavior and formability of friction stir processed DP600 steel
  92. Synthesis and characterization of bismuth oxide/commercial activated carbon composite for battery anode
  93. Phytochemical analysis of Ziziphus jujube leaf at different foliar ages based on widely targeted metabolomics
  94. Effects of in ovo injection of black cumin (Nigella sativa) extract on hatching performance of broiler eggs
  95. Separation and evaluation of potential antioxidant, analgesic, and anti-inflammatory activities of limonene-rich essential oils from Citrus sinensis (L.)
  96. Bioactivity of a polyhydroxy gorgostane steroid from Xenia umbellata
  97. BiCAM-based automated scoring system for digital logic circuit diagrams
  98. Analysis of standard systems with solar monitoring systems
  99. Structural and spectroscopic properties of voriconazole and fluconazole – Experimental and theoretical studies
  100. New plant resistance inducers based on polyamines
  101. Experimental investigation of single-lap bolted and bolted/bonded (hybrid) joints of polymeric plates
  102. Investigation of inlet air pressure and evaporative cooling of four different cogeneration cycles
  103. Review Articles
  104. Comprehensive review on synthesis, physicochemical properties, and application of activated carbon from the Arecaceae plants for enhanced wastewater treatment
  105. Research progress on speciation analysis of arsenic in traditional Chinese medicine
  106. Recent modified air-assisted liquid–liquid microextraction applications for medicines and organic compounds in various samples: A review
  107. An insight on Vietnamese bio-waste materials as activated carbon precursors for multiple applications in environmental protection
  108. Antimicrobial activities of the extracts and secondary metabolites from Clausena genus – A review
  109. Bioremediation of organic/heavy metal contaminants by mixed cultures of microorganisms: A review
  110. Sonodynamic therapy for breast cancer: A literature review
  111. Recent progress of amino acid transporters as a novel antitumor target
  112. Aconitum coreanum Rapaics: Botany, traditional uses, phytochemistry, pharmacology, and toxicology
  113. Corrigendum
  114. Corrigendum to “Petrology and geochemistry of multiphase post-granitic dikes: A case study from the Gabal Serbal area, Southwestern Sinai, Egypt”
  115. Corrigendum to “Design of a Robust sliding mode controller for bioreactor cultures in overflow metabolism via an interdisciplinary approach”
  116. Corrigendum to “Statistical analysis on the radiological assessment and geochemical studies of granite rocks in the north of Um Taghir area, Eastern Desert, Egypt”
  117. Corrigendum to “Aroma components of tobacco powder from different producing areas based on gas chromatography ion mobility spectrometry”
  118. Corrigendum to “Mechanical properties, elastic moduli, transmission factors, and gamma-ray-shielding performances of Bi2O3–P2O5–B2O3–V2O5 quaternary glass system”
  119. Erratum
  120. Erratum to “Copper(ii) complexes supported by modified azo-based ligands: Nucleic acid binding and molecular docking studies”
  121. Special Issue on Applied Biochemistry and Biotechnology (ABB 2021)
  122. Study of solidification and stabilization of heavy metals by passivators in heavy metal-contaminated soil
  123. Human health risk assessment and distribution of VOCs in a chemical site, Weinan, China
  124. Preparation and characterization of Sparassis latifolia β-glucan microcapsules
  125. Special Issue on the Conference of Energy, Fuels, Environment 2020
  126. Improving the thermal performance of existing buildings in light of the requirements of the EU directive 2010/31/EU in Poland
  127. Special Issue on Ethnobotanical, Phytochemical and Biological Investigation of Medicinal Plants
  128. Study of plant resources with ethnomedicinal relevance from district Bagh, Azad Jammu and Kashmir, Pakistan
  129. Studies on the chemical composition of plants used in traditional medicine in Congo
  130. Special Issue on Applied Chemistry in Agriculture and Food Science
  131. Strip spraying technology for precise herbicide application in carrot fields
  132. Special Issue on Pharmacology and Metabolomics of Ethnobotanical and Herbal Medicine
  133. Phytochemical profiling, antibacterial and antioxidant properties of Crocus sativus flower: A comparison between tepals and stigmas
  134. Antioxidant and antimicrobial properties of polyphenolics from Withania adpressa (Coss.) Batt. against selected drug-resistant bacterial strains
  135. Integrating network pharmacology and molecular docking to explore the potential mechanism of Xinguan No. 3 in the treatment of COVID-19
  136. Chemical composition and in vitro and in vivo biological assortment of fixed oil extracted from Ficus benghalensis L.
  137. A review of the pharmacological activities and protective effects of Inonotus obliquus triterpenoids in kidney diseases
  138. Ethnopharmacological study of medicinal plants in Kastamonu province (Türkiye)
  139. Protective effects of asperuloside against cyclophosphamide-induced urotoxicity and hematotoxicity in rats
  140. Special Issue on Essential Oil, Extraction, Phytochemistry, Advances, and Application
  141. Identification of volatile compounds and antioxidant, antibacterial, and antifungal properties against drug-resistant microbes of essential oils from the leaves of Mentha rotundifolia var. apodysa Briq. (Lamiaceae)
  142. Phenolic contents, anticancer, antioxidant, and antimicrobial capacities of MeOH extract from the aerial parts of Trema orientalis plant
  143. Chemical composition and antimicrobial activity of essential oils from Mentha pulegium and Rosmarinus officinalis against multidrug-resistant microbes and their acute toxicity study
  144. Special Issue on Marine Environmental Sciences and Significance of the Multidisciplinary Approaches
  145. An insightful overview of the distribution pattern of polycyclic aromatic hydrocarbon in the marine sediments of the Red Sea
  146. Antifungal–antiproliferative norcycloartane-type triterpenes from the Red Sea green alga Tydemania expeditionis
  147. Solvent effect, dipole moment, and DFT studies of multi donor–acceptor type pyridine derivative
  148. An extensive assessment on the distribution pattern of organic contaminants in the aerosols samples in the Middle East
  149. Special Issue on 4th IC3PE
  150. Energetics of carboxylic acid–pyridine heterosynthon revisited: A computational study of intermolecular hydrogen bond domination on phenylacetic acid–nicotinamide cocrystals
  151. A review: Silver–zinc oxide nanoparticles – organoclay-reinforced chitosan bionanocomposites for food packaging
  152. Green synthesis of magnetic activated carbon from peanut shells functionalized with TiO2 photocatalyst for Batik liquid waste treatment
  153. Coagulation activity of liquid extraction of Leucaena leucocephala and Sesbania grandiflora on the removal of turbidity
  154. Hydrocracking optimization of palm oil over NiMoO4/activated carbon catalyst to produce biogasoline and kerosine
  155. Special Issue on Pharmacology and metabolomics of ethnobotanical and herbal medicine
  156. Cynarin inhibits PDGF-BB-induced proliferation and activation in hepatic stellate cells through PPARγ
  157. Special Issue on The 1st Malaysia International Conference on Nanotechnology & Catalysis (MICNC2021)
  158. Surfactant evaluation for enhanced oil recovery: Phase behavior and interfacial tension
  159. Topical Issue on phytochemicals, biological and toxicological analysis of aromatic medicinal plants
  160. Phytochemical analysis of leaves and stems of Physalis alkekengi L. (Solanaceae)
  161. Phytochemical and pharmacological profiling of Trewia nudiflora Linn. leaf extract deciphers therapeutic potentials against thrombosis, arthritis, helminths, and insects
  162. Pergularia tomentosa coupled with selenium nanoparticles salvaged lead acetate-induced redox imbalance, inflammation, apoptosis, and disruption of neurotransmission in rats’ brain
  163. Protective effect of Allium atroviolaceum-synthesized SeNPs on aluminum-induced brain damage in mice
  164. Mechanism study of Cordyceps sinensis alleviates renal ischemia–reperfusion injury
  165. Plant-derived bisbenzylisoquinoline alkaloid tetrandrine prevents human podocyte injury by regulating the miR-150-5p/NPHS1 axis
  166. Network pharmacology combined with molecular docking to explore the anti-osteoporosis mechanisms of β-ecdysone derived from medicinal plants
  167. Chinese medicinal plant Polygonum cuspidatum ameliorates silicosis via suppressing the Wnt/β-catenin pathway
  168. Special Issue on Advanced Nanomaterials for Energy, Environmental and Biological Applications - Part I
  169. Investigation of improved optical and conductivity properties of poly(methyl methacrylate)–MXenes (PMMA–MXenes) nanocomposite thin films for optoelectronic applications
  170. Special Issue on Applied Biochemistry and Biotechnology (ABB 2022)
  171. Model predictive control for precision irrigation of a Quinoa crop
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