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Potential of adsorbents from agricultural wastes as alternative fillers in mixed matrix membrane for gas separation: A review

  • Alia Aqilah Ghazali , Sunarti Abd Rahman EMAIL logo and Rozaimi Abu Samah
Published/Copyright: March 17, 2020
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Green Processing and Synthesis
From the journal Green Processing and Synthesis Volume 9 Issue 1

Abstract

Mixed matrix membrane (MMM), formed by dispersing fillers in polymer matrix, has attracted researchers’ attention due to its outstanding performance compared to polymeric membrane. However, its widespread use is limited due to high cost of the commercial filler which leads to the studies on alternative low-cost fillers. Recent works have focused on utilizing agricultural wastes as potential fillers in fabricating MMM. A membrane with good permeability and selectivity was able to be prepared at low cost. The objective of this review article is to compile all the available information on the potential agricultural wastes as fillers in fabricating MMM for gas separation application. The gas permeation mechanisms through polymeric and MMM as well as the chemical and physical properties of the agricultural waste fillers were also reviewed. Additionally, the economic study and future direction of MMM development especially in gas separation field were discussed.

Keywords: adsorbent; gas separation; agricultural waste; low-cost filler; mixed matrix membrane

1 Introduction

Separation of gases is crucial especially in chemical and petrochemical plants such as landfill gas purification, biogas upgrading, and natural gas sweetening [1]. Natural gas carries a large amount of energy that can be used as a source of cooking, heating, and electricity, as well as fuel for vehicles and as a chemical feedstock. However, crude natural gas contains acid gases such as carbon dioxide (CO2) and hydrogen sulfide (H2S) [2]. These acidic gases are very corrosive, toxic, and flammable which can cause corrosion problems in gas transportation system. Therefore, it is necessary to remove these impurities from natural gas to meet the pipeline quality standard specifications, which only allows CO2 of less than 2 mol% [3].

Conventional industrial methods employed for gas separation include cryogenic distillation [4], physical adsorption [5] and chemical absorption [6]. Although the processes are widely known and established, they have their own inherent problems which include sensitive operating conditions, less effective, and high energy consumption [7]. Concerning these deficiencies, numerous methods have been introduced to find an alternative process for gas separation application. Membrane-based gas separation technology is growing fast and has gained a great interest by the researchers due to its promising features, such as its simplicity, easy operation, low energy consumption, and its compact structure [8].

Polymeric membrane is the commonly used membrane due to its superior gas separation properties [9]. However, the inherent trade-off between the gas permeability and selectivity deters the application of polymeric membranes [10]. A considerable effort has been put into investigations to overcome the limitation of polymeric membranes. Mixed matrix membrane (MMM), a new type of membrane formed by introducing fillers into a polymer matrix, has been identified to solve the aforementioned issues [11]. The most widely used fillers employed in the literature of adsorptive MMM are inorganic materials such as zeolite, carbon nanotube, and metal organic framework [12]. This type of membrane has the probability to achieve higher permeability and enhance selectivity, or both simultaneously [13]. However, the high cost of the existing inorganic material restricts its application [14]. This issue creates demand for new filler materials for MMM.

Recently, attention has been given towards new and novel materials which is agricultural wastes to replace the costly commercial inorganic fillers. The utilization of agricultural wastes as a potential adsorbent has been explored by many researchers for various applications as listed in Table 1.

Table 1

Adsorbent from agricultural wastes for various applications.

NoAgricultural wastesApplicationsReferences
1.Almond shells• CO2 adsorptionPlaza et al. [15]
2.Argan fruit shells• CO2 captureBoujibar et al. [16]
3.Avocado peel• Removal of dyesPalma et al. [17]
4.Bagasse fly ash• Removal of Orange G and methyl violetMall et al. [18]
5.Banana peel• Adsorption of dyes from aqueous solutionAnnadurai et al. [19]
6.Caesalpinia bonducella seed• Removal of Ni(II)Goh et al. [20]
7.Cherry stone• CO2/CH4 separationÁlvarez-Gutiérrez et al. [21]
8.Coconut shell• SO2 adsorption and thermal regenerationTseng and Wey [22]
• Phenol adsorption from aqueous solutionKarri et al. [23]
Karri et al. [24]
9.Coffee• CO2 captureQuerejeta et al. [25]
10.Corn cob• Carbon adsorbentsKaźmierczak et al. [26]
11.Eggshell• CO2 adsorptionWitoon [27]
12.Eucalyptus camaldulensis wood• CO2 adsorptionHeidari et al. [28]
13.Fir bark• CO2 adsorptionLuo et al. [29]
14.Hazelnut shell• Adsorption of Cr(VI)Kobya [30]
15.Kernell shell• CO2 adsorptionNasri et al. [31]
16.Longan shells• CO2 captureWei et al. [32]
17.Lotus stem• CO2 captureWu et al. [33]
18.Macadamia nut shell• CO2 captureBae and Su [34]
19.Oil palm frond• Adsorption of bentazon from aqueous solutionSalman and Hameed [35]
20.Oil palm shell• Removal of H2SGuo et al. [36]
21.Olive stone• CO2 adsorptionPlaza et al. [37]
22.Orange peel powder• Water purificationBhatnagar et al. [38]
23.Palm oil kernel shell• Disposal of Zn(II) from aqueous environmentKarri and Sahu [39]
Karri and Sahu [40]
24.Palm shell• Removal of SO2 and NOSumathi et al. [41]
25.Paulownia sawdust• CO2 adsorbentZhu et al. [42]
26.Persian ironwood• CO2 captureNowrouzi et al. [43]
27.Pineapple stem waste• Removal of dyes from wastewaterHameed et al. [44]
28.Pistachio nut shell• SO2 adsorptionLua and Yang [45]
29.Pomegranate peels• CO2 captureSerafin et al. [46]
30.Rice husk• CO2 adsorptionLi et al. [47]
31.Soya chunk• O2 reduction and CO2 captureRana et al. [48]
32.Vine shoot• CO2 separationManyà et al. [49]
33.Walnut shell• CO2 adsorption and separationRouzitalab et al. [50]
34.Wheat straw• Removal of Cd in aqueous solutionLiu and Fan [51]
35.Wood• H2S removalNguyen-Thanh and Bandosz [52]
• SO2 retentionMacías-Pérez et al. [53]

The literature shows that adsorbents prepared from agricultural wastes have been extensively used due to their excellent performances and low cost. There is minimal information on agricultural waste adsorbent used for gas separation. However, the number of studies in the field is increasing due to its promising features and excellent performances. On top of that, this paper will arrange all the available information on the progress of that has already been made and elaborate more on agricultural waste as potential filler in MMM used for gas separation application.

2 Gas permeation mechanism

The morphology and performance of the MMM mainly depend on the choice of polymer, filler, and the amount of filler loaded in the polymer matrix. To identify the right type of polymer and dispersed filler, the transport mechanisms through the membrane should be first taken into consideration. All the gas permeation mechanisms in polymeric membrane and MMM are explained in this section.

2.1 Gas permeation mechanism through polymeric membranes

Membrane transport mechanisms are very much dependent on membrane morphology or microscopic structure. Membranes can be broadly classified into two classes; porous and nonporous (dense) [54]. The mechanism of gas separation by nonporous membranes is different to that of porous membranes.

A porous membrane consists of a rigid matrix with highly voided structure that are interconnected and randomly distributed [55]. The separation of particles occurs in porous membranes mainly depends on the molecular size and membrane pore size distribution. Generally, only molecules that differ in sizes can be separated efficiently by porous membranes. Another class of membrane which provides good separation of particular gas from their mixtures but with low transport rates of the gases is called nonporous or dense membrane. The separation of solutes in nonporous membrane may be achieved if the solubility and diffusivity differ significantly.

For gas separation across the membrane, various mechanisms have been discovered which include viscous flow, Knudsen diffusion, molecular sieve effect, and solution–diffusion mechanism [56]. Figure 1 represents the schematic diagram of the mechanisms for the permeation of gases through porous and nonporous membranes.

Figure 1 Mechanisms for permeation of gases through membranes.
Figure 1

Mechanisms for permeation of gases through membranes.

Separation using porous membrane is usually described by Knudsen diffusion and molecular sieve effect [57]. Gas molecules tend to interact more with the pore walls compared with other gas molecules. Each molecule moves independently as there are less collisions among molecules. Thus, the separation occurs successfully due to different gas species moving at different speeds. Next, molecular sieving is basically depends on the precise pore size and shape distribution among various gas molecules by micropores of less than 7 Å in diameter [58].

According to Bernardo et al. [59], commercial membrane modules employed for gas separation are nonporous. It obeys the solution–diffusion mechanism which involves a three-step process (schematically illustrated in Figure 2) [58]: (1) the absorption or adsorption at the surface of the membrane (upstream side), (2) activated diffusion (solubility) through the membrane, and (3) desorption at the downstream side. The permeation of molecules across the membranes is based on two major factors, which are diffusivity coefficient (D) and solubility coefficient (S) [12,60]. Diffusivity measures the capability of a molecule to pass through the membrane. Meanwhile, solubility is the ratio of the dissolved penetrant concentration in the upstream side of the polymer to the upstream penetrant partial pressure. Therefore, the permeability (P) can be defined as shown in Eq. 1 [61].

Figure 2 Illustration of the three steps involved in the solution diffusion theory.
Figure 2

Illustration of the three steps involved in the solution diffusion theory.

(1)P=DS

The diffusion and solubility coefficients are expressed in cm2/s and cm3 (STP)/(cm3 polymer atm) or cm3 (STP)/(cm3 polymer cm Hg), respectively. The ability of a membrane to separate two different gas molecules (A and B), is the ratio of their permeabilities, or also known as ideal selectivity as shown in Eq. 2 [62].

(2)αA/B=PAPB

The gas transport in composite membranes is strongly dependent on the selective layer structure, characteristics of gas molecules and the interaction between the gas molecules and the membrane material.

A few approaches have been adopted by researchers to modify and optimize the structure of the polymer membrane to overcome the trade-off problems. Attempts have been made where inorganic fillers are embedded in a polymer matrix producing MMM to improve the solubility of permeate molecules [20]. The mechanism of gas permeation through MMM is covered in the next section.

2.2 Gas permeation mechanism through mixed matrix membrane (MMM)

MMM is one of the latest kind of composite membranes which consists of two phases; organic polymer and inorganic filler as the dispersed phase [63]. Figure 3 shows a typical separation mechanism of a gas pair using MMM. The dominant mechanism in MMM is the combination of solution-diffusion and Knudsen diffusion [64].

Figure 3 Schematic diagram of a typical separation mechanism of gases in MMM [64]. Copyright 2019. Reproduced with permission from Elsevier Science Ltd.
Figure 3

Schematic diagram of a typical separation mechanism of gases in MMM [64]. Copyright 2019. Reproduced with permission from Elsevier Science Ltd.

Mainly, the adsorption process occurs in the MMM comes from the dispersed filler particles. The fillers incorporated into the polymer matrix can be classified into porous (zeolite [65], graphene oxide [66], carbon molecular sieve (CMS) [67], metal organic framework (MOF) [68] and carbon nanotubes (CNTs) [69]) and nonporous (silica [70] and titanium oxide (TiO2) [71]) fillers [72]. For porous filler, the transportation of gas molecules through the filler follows the effects of molecular sieve and surface diffusion [73]. The term molecular sieve defines a class of material that separates different gases in a mixture by their molecular size or shape [15]. The addition of filler with molecular sieving properties in the MMM is expected to enhance the permeability of the membrane. Adsorption and selective surface flow mechanism need to be considered if the pore size is significantly bigger than the size of particle [7]. Nonporous fillers reduce the diffusion of larger molecules. Therefore, the application of nonporous filler in industrial applications is very limited due to its low permeability and expensive price.

The success of an MMM largely depends on the type of polymer matrix and inorganic filler as well as the relationship between both phases [74]. The presence of filler particles in polymer matrix could modify the membrane properties and alter the morphologies of the membrane. Besides, the size of the inorganic fillers also plays a big role in the MMM performance. The presence of nanosized inorganic fillers (<100 nm) may increase free-volume of membranes by altering the polymer chains leading to a higher gas diffusion [75,76].

3 Role of agricultural waste adsorbent in mixed matrix membrane (MMM)

For the past few decades, MMM attracted a great attention by the industry and academia for gas separation [77]. However, the current available fillers are significantly pricier and less economical which restricts its application. Recently, researchers have particularly concentrated on the adsorbents produced from agricultural wastes due to their favorable circumstances of low cost, availability, and eco friendliness. The attractive features offered by this technology have stimulated the interest to discover the performance of agricultural waste fillers in the fabrication of MMM for gas separation applications. In 2016, a new concept of MMM with the incorporation of agricultural waste filler into the polymer matrix was introduced.

Waheed et al. [78] studied the effects induced by the incorporation of agricultural waste filler in the separation properties of the MMM for gas separation application. They fabricated an MMM based on PSF and mesoporous silica filler extracted from rice husk ash for the separation of CO2. In the study, the rice husk silica (RHS) underwent surface modification with 4-aminophenazone (4-AMP) to enhance the CO2 adsorption. The performance of the MMM containing various amounts (10, 20, 30 and 40 wt% based on polymer weight) of RHS and RHS functionalized with 4-AMP were compared with a pristine polymeric membrane of PSF. The prepared MMMs showed a better membrane permeability (85%) compared to that of the plain PSF membrane (55%). The most ideal MMM with the best performance was recorded with functionalized RHS loading of up to 40%. The authors stated that the existence of large mesopores in the filler offered a broad passage for the transportation of gases through the membranes, which increased the membrane permeability. Besides, the functionalized RHS showed significantly better gas selectivity compared to the nonfunctionalized RHS. The possible reason to this behavior is due to surface modification decreased the surface area, pore volume and pore size of the RHS which resulted in reduced permeability of the undesired and bigger gas molecules (CH4 and N2) but did not significantly affect the smaller species (CO2). Table 2 summarized the Brunauer, Emmett and Teller (BET) analysis data for the silica extracted from agricultural wastes and commercial silica. The slight difference in the surface areas and pore characteristics of these agricultural waste fillers compared to the commercial silica indicates that agricultural wastes are possible to be an alternative low-cost filler.

Table 2

BET analysis of silica extracted from rice husk and rice straw as well as the commercial silica fillers.

Sample typeBET surface area (m2/g)Pore volume (cm3/g)Pore size (nm)References
RHS295.020.14615.35Waheed et al. [78]
RHS-AMP257.290.09511.33
Silica from rice straw404.30.5715.0Bhattacharya and Mandal [79]
Commercial silica326.90.2202.6Lu and Hsieh [80]

Bhattacharya and Mandal [79] reported the performance of nano sized silica extracted from rice straw as filler in polyether-polyamide block copolymer (PEBA) for CO2 separation application. The nanosilica/PEBA membrane was prepared by solution casting method with different nanosilica concentrations (0.5, 1, and 2 wt%) added into the PEBA matrix. From the field emission scanning electron microscopy (FESEM) images as shown in Figure 4, it is observed that the surface morphology of all the membranes are dense in structure. The bright spots on the surface of the membranes represent the presence of nanosilica distributed homogenously throughout the PEBA matrix indicating that the nanofiller and polymer were in good interface compatibility. However, at higher nanosilica loadings, the size of the nano-silica increased which could be ascribed to excess nanosilica particles aggregate exposed on the outer surface of the PEBA membrane. Similarly as reported in Sanaeepur et al. [74] recent study where agglomeration occurred at 2 wt% of copper nanoparticles loadings. The accumulation tendency of nanofillers in polymer matrix is due to the strong attractive energy between these nanoparticles (bonded by Van der Waals interactions) [81].

Figure 4 FESEM images of dense (a) pure PEBA and nanocomposite PEBA membranes, (b) 0.5 wt%, (c) 1 wt%, and (d) 2 wt% bio-nano-SiO2 particles [79]. Copyright 2019. Reproduced with permission from Elsevier Science Ltd.
Figure 4

FESEM images of dense (a) pure PEBA and nanocomposite PEBA membranes, (b) 0.5 wt%, (c) 1 wt%, and (d) 2 wt% bio-nano-SiO2 particles [79]. Copyright 2019. Reproduced with permission from Elsevier Science Ltd.

Meanwhile, the atomic force microscopy (AFM) results revealed that there are variation in surface roughness of pure PEBA and MMM. Figure 5 displays the plane and three-dimensional (3D) views of the membrane surface topography with and without the nanofillers. Based on the results obtained, the introduction of nanosilica significantly effects the surface roughness of the membrane. The surface roughness parameter of the nanocomposite membrane enhanced as compared to the pure PEBA membrane. The surface of the membrane becomes rougher with an addition of nanosilica resulting in an enlarged surface area which may leads to a better gas permeation through the membrane [82]. The gas permeation results show significant improvement in the permeability of CO2 for 2 wt% nanosilica/PEBA membrane compared to pure PEBA membrane, from 22.0 up to 270.0 Barrer, respectively. Similarly as reported by Zhao et al. [83] in the preparation of graphene oxide nanocomposite membrane.

Figure 5 Atomic force microscopy (AFM) image of surface roughness of (a) pure PEBA membrane and (b) silica/PEBA MMM (PS-2) [79]. Copyright 2019. Reproduced with permission from Elsevier Science Ltd.
Figure 5

Atomic force microscopy (AFM) image of surface roughness of (a) pure PEBA membrane and (b) silica/PEBA MMM (PS-2) [79]. Copyright 2019. Reproduced with permission from Elsevier Science Ltd.

The use of this filler significantly impacts the surface chemistry and separation efficiency of the membrane. Subsequently, the incorporation of this filler into the polymer matrix influence the physical and chemical properties such as porosity, surface roughness and surface charge. Table 3 summarized the permeability and selectivity results of MMMs incorporated with fillers from wastes compared to the commercial fillers reported in the recent years.

Table 3

Comparison of the gas performances of the agricultural wastes and commercial fillers.

FillerPolymer matrixTest conditionsGas pairCO2 permeability (Barrer)SelectivityReferences
Nano-silica extracted

from rice straw		Polyether block

amide (Pebax)		P = 7 bar T = 30°CCO2/CH4

CO2/Air		2705.3

4.1		Bhattacharya

and Mandal [79]
Silica extracted from

rice husk		Polysulfone (PSF)P = 10 bar T = 25°CCO2/CH4

CO2/N2		8.4633.31

32.79		Waheed et al. [78]
Commercial silicaPebax-1074P = 15 bar T = 25°CCO2/CH4105.9426.09Azizi et al. [84]
Nano-silicaPolyimideP = 15 bar T = 25°CCO2/CH426532Chen et al. [85]
Nano-zeoliteMatrimidP = 35 bar T = 25°CCO2/CH417.5243.3Ebadi Amooghin et al. [86]
Fumed silicaPebaxP = 8 bar T = 25°CCO2/CH460.1526.15Aghaei et al. [87]

Generally, the addition of a small weight fraction of agricultural waste filler into polymer matrix can give a substantial improvement in the overall membrane separation performance. The filler production from agricultural waste is considered to be both economical and environmentally beneficial. Sumathi et al. [41] stated that specific properties of the agricultural wastes such as large specific area, porous structure, and enriched surface functional groups make it to be promising adsorbents for various applications including gas separation. The slight difference in the permeability and selectivity of these agricultural waste fillers compared to the commercial fillers indicates that agricultural wastes are possible to be an alternative low-cost filler. According to these results, the application of adsorbents prepared from agricultural wastes is promising to replace the costly commercial adsorbent for gas separation. However, the number of research on MMM containing agricultural wastes particles for gas separation is still low compared to that for wastewater treatment.

All in all, the utilization of agricultural waste material as low-cost filler in MMM is proven to enhance the membrane performance. Compared to conventional filler, this low-cost filler will bring a new pathway for green synthesis of MMM, making the process environmentally and cost effective.

4 Economic potential

Like other developing countries, Malaysia also faces the issues of waste generation and disposal [88]. Roughly 30,000 tons of municipal solid wastes are produced daily, covering 83% of the country’s waste generation, including agricultural wastes. Worldwide, the amount of agricultural waste generated is around 998 million tons annually and in Malaysia, 1.2 million tons of agricultural waste is dumped and buried in landfills per year [89]. Clearly, recycling or reusing these wastes would greatly reduce waste disposal and its resultant impact on the environment. Some agricultural wastes such as coconut shells and orange peels are both nonhazardous and nontoxic in nature. Therefore, they have high potential to be converted into useful products at low cost especially adsorbent or as filler in MMM.

Cost of filler is one of the important matters that must be considered when choosing a filler. The prices of fillers from agricultural wastes need to be compared with the conventional fillers available in the market to identify the cost effectiveness. However, the prices of fillers listed in the previous section are very limited and some are not available. According to Mashhor, pineapple peel waste can be obtained at RM0.10/kg in Malaysian Pineapple Industry Board (personal communication, February 8, 2019). Meanwhile, the estimated market price of fillers such as nano graphene oxide is approximately RM 4,380 to 7,140/kg (depends on its grade) (personal communication, Feb 13, 2018). It is obvious that agricultural waste is way cheaper than the commercial filler. Generally, it is widely known that agricultural wastes can be acquired at a lower cost value due to its abundant availability.

According to Waheed et al. [78], chemically modified agricultural wastes exhibit better adsorption performances than their unmodified forms. Although it requires extra cost, the improvement of the adsorption capacities may cover the overall cost. Moreover, the superior adsorption capacity of the filler from agricultural waste indicates that the filler is potentially marketable.

Despite the positive trend of the development worldwide, no MMM incorporated with agricultural waste filler has been available for commercialization so far. This suggests that more research and development work on the mass production of the MMM containing agricultural waste filler with enhanced performance need to be effectively evaluated and investigated prior to commercialization.

5 Future work

MMM has attracted a great attention from the researchers due to the outstanding performance of high permeability and better selectivity. Despite the excellent performance, MMM still has its limitation. The main problem faced in the formation of a defect-free MMM is mainly due to the poor contact between the polymer and fillers because of the difference in properties between these two phases, coupled with the strong aggregation tendency of fillers. These polymer–particle interface defects can affect the overall membrane separation performances. Regarding the issues, the following defects should be avoided for the formation of an ideal MMM: (1) interface voids formation, (2) polymer layer around the particles, and (3) filler particles pore blockage.

Voids formation at the surface of the membrane provides the path for the gas molecules to pass through them causing a higher permeability compared to that of the neat polymer. Depending on the size of the voids, the selectivity can be higher than, closely equal to or lower than the neat polymer. Furthermore, polymer layer formed around the particles can cause immobilization of polymer chains at the polymer-particle interface, which lowers gas sorption and permeation in semi-crystalline structure. Although filler particles pore blockage did not change the selectivity due to the effect of partial pore blockage of particle and polymer chain rigidification, but, it will decreases the permeability of the membrane. Improper material selection will form the undesirable morphologies at the polymer-filler interface [90].

MMMs for application in gas separation are normally comprised of different inorganic/ organic fillers embedded into the polymer matrix. However, the most severe challenges in MMM preparation are the agglomeration and sedimentations of particles in the polymer matrix caused by poor dispersion of inorganic fillers. Difference in physicochemical properties such as the density and polarity of the filler and polymer results in particle accumulation which leads to solid sedimentation or migration to the surface. Successful MMMs are essential to improve multiple functions with appropriate pore structure and surface area of the filler, so that they will give an impact on real commercial applications. Therefore, using a proper filler, altering the interfacial morphology of the filler-polymer, controlling the MMM preparation condition as well as suppressing the formation of undesired defects are the important aspects should be considered for development of high performance MMMs [91].

Even though the agricultural waste fillers have significant effects on the MMM performance, the number of research that can be found in the literature on the production and application of agricultural waste filler particles incorporated into MMM for purification and separation of gases are still minimal compared to those pure polymeric membranes. Subsequently, it shows that MMM still requires a long journey to completely explore and utilize its potential.

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Acknowledgments

The authors would like to express their gratitude to Universiti Malaysia Pahang for supporting this work under Fundamental Research Grant Scheme (FRGS/1/2018/TK02/UMP/02/8).

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Received: 2019-07-17
Accepted: 2020-01-07
Published Online: 2020-03-17

© 2020 Ghazali et al., published by De Gruyter

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

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https://doi.org/10.1515/gps-2020-0023
Keywords for this article
adsorbent; gas separation; agricultural waste; low-cost filler; mixed matrix membrane
Creative Commons
BY 4.0

Articles in the same Issue

  1. Obituary for Prof. Dr. Jun-ichi Yoshida
  2. Regular Articles
  3. Optimization of microwave-assisted manganese leaching from electrolyte manganese residue
  4. Crustacean shell bio-refining to chitin by natural deep eutectic solvents
  5. The kinetics of the extraction of caffeine from guarana seed under the action of ultrasonic field with simultaneous cooling
  6. Biocomposite scaffold preparation from hydroxyapatite extracted from waste bovine bone
  7. A simple room temperature-static bioreactor for effective synthesis of hexyl acetate
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  9. Efficient synthesis of palladium nanoparticles using guar gum as stabilizer and their applications as catalyst in reduction reactions and degradation of azo dyes
  10. Isolation of biosurfactant producing bacteria from Potwar oil fields: Effect of non-fossil fuel based carbon sources
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  12. Dielectric properties and microwave heating behavior of neutral leaching residues from zinc metallurgy in the microwave field
  13. Green synthesis and stabilization of silver nanoparticles using Lysimachia foenum-graecum Hance extract and their antibacterial activity
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  15. Synthesis and catalytic properties of nickel salts of Keggin-type heteropolyacids embedded metal-organic framework hybrid nanocatalyst
  16. Preparation and properties of hydrogel based on sawdust cellulose for environmentally friendly slow release fertilizers
  17. Structural characterization, antioxidant and cytotoxic effects of iron nanoparticles synthesized using Asphodelus aestivus Brot. aqueous extract
  18. Phase transformation involved in the reduction process of magnesium oxide in calcined dolomite by ferrosilicon with additive of aluminum
  19. Green synthesis of TiO2 nanoparticles from Syzygium cumini extract for photo-catalytic removal of lead (Pb) in explosive industrial wastewater
  20. The study on the influence of oxidation degree and temperature on the viscosity of biodiesel
  21. Prepare a catalyst consist of rare earth minerals to denitrate via NH3-SCR
  22. Bacterial nanobiotic potential
  23. Green synthesis and characterization of carboxymethyl guar gum: Application in textile printing technology
  24. Potential of adsorbents from agricultural wastes as alternative fillers in mixed matrix membrane for gas separation: A review
  25. Bactericidal and cytotoxic properties of green synthesized nanosilver using Rosmarinus officinalis leaves
  26. Synthesis of biomass-supported CuNi zero-valent nanoparticles through wetness co-impregnation method for the removal of carcinogenic dyes and nitroarene
  27. Synthesis of 2,2′-dibenzoylaminodiphenyl disulfide based on Aspen Plus simulation and the development of green synthesis processes
  28. Catalytic performance of the biosynthesized AgNps from Bistorta amplexicaule: antifungal, bactericidal, and reduction of carcinogenic 4-nitrophenol
  29. Optical and antimicrobial properties of silver nanoparticles synthesized via green route using honey
  30. Adsorption of l-α-glycerophosphocholine on ion-exchange resin: Equilibrium, kinetic, and thermodynamic studies
  31. Microwave-assisted green synthesis of silver nanoparticles using dried extracts of Chlorella vulgaris and antibacterial activity studies
  32. Preparation of graphene oxide/chitosan complex and its adsorption properties for heavy metal ions
  33. Green synthesis of metal and metal oxide nanoparticles from plant leaf extracts and their applications: A review
  34. Synthesis, characterization, and electrochemical properties of carbon nanotubes used as cathode materials for Al–air batteries from a renewable source of water hyacinth
  35. Optimization of medium–low-grade phosphorus rock carbothermal reduction process by response surface methodology
  36. The study of rod-shaped TiO2 composite material in the protection of stone cultural relics
  37. Eco-friendly synthesis of AuNPs for cutaneous wound-healing applications in nursing care after surgery
  38. Green approach in fabrication of photocatalytic, antimicrobial, and antioxidant zinc oxide nanoparticles – hydrothermal synthesis using clove hydroalcoholic extract and optimization of the process
  39. Green synthesis: Proposed mechanism and factors influencing the synthesis of platinum nanoparticles
  40. Green synthesis of 3-(1-naphthyl), 4-methyl-3-(1-naphthyl) coumarins and 3-phenylcoumarins using dual-frequency ultrasonication
  41. Optimization for removal efficiency of fluoride using La(iii)–Al(iii)-activated carbon modified by chemical route
  42. In vitro biological activity of Hydroclathrus clathratus and its use as an extracellular bioreductant for silver nanoparticle formation
  43. Evaluation of saponin-rich/poor leaf extract-mediated silver nanoparticles and their antifungal capacity
  44. Propylene carbonate synthesis from propylene oxide and CO2 over Ga-Silicate-1 catalyst
  45. Environmentally benevolent synthesis and characterization of silver nanoparticles using Olea ferruginea Royle for antibacterial and antioxidant activities
  46. Eco-synthesis and characterization of titanium nanoparticles: Testing its cytotoxicity and antibacterial effects
  47. A novel biofabrication of gold nanoparticles using Erythrina senegalensis leaf extract and their ameliorative effect on mycoplasmal pneumonia for treating lung infection in nursing care
  48. Phytosynthesis of selenium nanoparticles using the costus extract for bactericidal application against foodborne pathogens
  49. Temperature effects on electrospun chitosan nanofibers
  50. An electrochemical method to investigate the effects of compound composition on gold dissolution in thiosulfate solution
  51. Trillium govanianum Wall. Ex. Royle rhizomes extract-medicated silver nanoparticles and their antimicrobial activity
  52. In vitro bactericidal, antidiabetic, cytotoxic, anticoagulant, and hemolytic effect of green-synthesized silver nanoparticles using Allium sativum clove extract incubated at various temperatures
  53. The green synthesis of N-hydroxyethyl-substituted 1,2,3,4-tetrahydroquinolines with acidic ionic liquid as catalyst
  54. Effect of KMnO4 on catalytic combustion performance of semi-coke
  55. Removal of Congo red and malachite green from aqueous solution using heterogeneous Ag/ZnCo-ZIF catalyst in the presence of hydrogen peroxide
  56. Nucleotide-based green synthesis of lanthanide coordination polymers for tunable white-light emission
  57. Determination of life cycle GHG emission factor for paper products of Vietnam
  58. Parabolic trough solar collectors: A general overview of technology, industrial applications, energy market, modeling, and standards
  59. Structural characteristics of plant cell wall elucidated by solution-state 2D NMR spectroscopy with an optimized procedure
  60. Sustainable utilization of a converter slagging agent prepared by converter precipitator dust and oxide scale
  61. Efficacy of chitosan silver nanoparticles from shrimp-shell wastes against major mosquito vectors of public health importance
  62. Effectiveness of six different methods in green synthesis of selenium nanoparticles using propolis extract: Screening and characterization
  63. Characterizations and analysis of the antioxidant, antimicrobial, and dye reduction ability of green synthesized silver nanoparticles
  64. Foliar applications of bio-fabricated selenium nanoparticles to improve the growth of wheat plants under drought stress
  65. Green synthesis of silver nanoparticles from Valeriana jatamansi shoots extract and its antimicrobial activity
  66. Characterization and biological activities of synthesized zinc oxide nanoparticles using the extract of Acantholimon serotinum
  67. Effect of calcination temperature on rare earth tailing catalysts for catalytic methane combustion
  68. Enhanced diuretic action of furosemide by complexation with β-cyclodextrin in the presence of sodium lauryl sulfate
  69. Development of chitosan/agar-silver nanoparticles-coated paper for antibacterial application
  70. Preparation, characterization, and catalytic performance of Pd–Ni/AC bimetallic nano-catalysts
  71. Acid red G dye removal from aqueous solutions by porous ceramsite produced from solid wastes: Batch and fixed-bed studies
  72. Review Articles
  73. Recent advances in the catalytic applications of GO/rGO for green organic synthesis
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