Startseite Methylene blue removal from aqueous solution using modified Met-SWCNT-Ag nanoparticles: optimization using RSM-CCD
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Methylene blue removal from aqueous solution using modified Met-SWCNT-Ag nanoparticles: optimization using RSM-CCD

  • Shirin Mahmoudi , Maryam Otadi EMAIL logo , Malak Hekmati EMAIL logo , Majid Monajjemi und Azadeh Sadat Shekarabi
Veröffentlicht/Copyright: 5. Juni 2023
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International Journal of Chemical Reactor Engineering
Aus der Zeitschrift International Journal of Chemical Reactor Engineering Band 21 Heft 10

Abstract

The presence of residual organic dyes in water resources results in a threat for both environment and human health due to their adverse health effects such as mutagenicity, carcinogenicity, and teratogenicity. Thus, they must be removed from industrial wastewater. Among these dyes, methylene blue (MB) is a toxic, carcinogenic, and almost non-biodegradable dye and can pose a significant threat to human health and environmental safety. Thus, it is removed from industrial effluents by a variety of methods, including adsorption, prior to discharge into the environment. This study aims to optimize the adsorption conditions of MB from an aqueous solution with nanocomposite of silver onto single-wall carbon nanotube metronidazole (Met-SWCNTs/Ag). Response Surface Methodology (RSM) based on Central Composite Design (CCD) is used to optimize and model the adsorption of MB dye (as pollutant) on Met-SWCNTs/Ag. The Met-SWCNTs/Ag is synthesized using Met-SWCNT impregnated with silver nitrate. The produced Met-SWCNT/Ag nanocomposite is characterized by Fourier transform infrared spectroscopy (FTIR), scanning electron microscopy (SEM), and X-ray diffraction (XRD). The effect of four independent variables including nanoparticle (NP)/dye ratio, temperature, pH and contact time on MB removal on the specific surface area of SWCNT/Ag and Met-SWCNTs/Ag is evaluated. The accuracy and fit of the model for MB removal using Met-SWCNTs/Ag are estimated by ANOVA with R2 > 0.99 and P-value < 0.0001. RSM results indicates that the NP/Dye ratio has the most significant influence on the adsorption of MB onto Met-SWCNTs/Ag. The optimal condition of the adsorption process takes place at NP/Dye ratio of 2.21, contact time of 65.57 min, and pH = 6.15 at 25.79 °C temperature leading into a 98.94 % MB removal. Isotherms and kinetic studies are performed to characterize the adsorption behavior of the adsorbent for MB removal. The adsorption behavior of the MB onto Met-SWCNTs/Ag is best described by the Langmuir isotherm model with regression coefficient R2 of 0.9935 with the Qmax of 112.42 mg/g. Adsorption kinetics of Met-SWCNT/Ag is investigated and modelled by means of the pseudo-first-order, pseudo-second-order models which is best fitted to the pseudo-second-order model. The thermodynamic study reveals that the adsorption of MB dye is spontaneous and exothermic. Experimental results suggest that the modified SWCNTs/Ag with Met achieves a higher removal efficiency of (∼98 %) when compared to SWCNTs/Ag (∼93 %).

Keywords: isotherm study; methylene blue removal; metronidazole; response surface methodology; single-wall carbon nanotube (SWCNT)
Corresponding authors: Maryam Otadi, Department of Chemical Engineering, Islamic Azad University, Central Tehran Branch, Tehran, Iran, E-mail: ; and Malak Hekmati, Department of Organic Chemistry, Faculty of Pharmaceutical Chemistry, Tehran Medical Sciences, Islamic Azad University, Tehran, Iran, E-mail:

  1. Author contributions: All the authors have accepted responsibility for the entire content of this submitted manuscript and approved submission.

  2. Research funding: None declared.

  3. Conflict of interest statement: The authors declare no conflicts of interest regarding this article.

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Received: 2022-12-28
Accepted: 2023-05-12
Published Online: 2023-06-05

© 2023 Walter de Gruyter GmbH, Berlin/Boston

Artikel in diesem Heft

  1. Frontmatter
  2. Articles
  3. Methylene blue removal from aqueous solution using modified Met-SWCNT-Ag nanoparticles: optimization using RSM-CCD
  4. Leaching behavior of germanium presented in different phases from zinc oxide dust under atmospheric acid leaching conditions
  5. TiO2 P25 and Kronos vlp 7000 materials activated by simulated solar light for atrazine degradation
  6. Numerical investigations on hydrothermal flame characteristics of water-cooled hydrothermal burner
  7. Moving bed biofilm reactor combined with an activated carbon filter for biological nitrate removal
  8. Preparation of bimodal mesoporous CoCe composite oxide for ethanol complete oxidation in air
  9. Hydrocracking of hydrotreated light cycle oil for optimizing BTEX production: a simple kinetic model
  10. Hydrodynamic comparison of different geometries of square cross-section airlift bioreactor using computational fluid dynamics
  11. Influence of different influence parameters on mixing characteristics of silicon particles in cassette
https://doi.org/10.1515/ijcre-2022-0240
Schlagwörter für diesen Artikel
isotherm study; methylene blue removal; metronidazole; response surface methodology; single-wall carbon nanotube (SWCNT)

Artikel in diesem Heft

  1. Frontmatter
  2. Articles
  3. Methylene blue removal from aqueous solution using modified Met-SWCNT-Ag nanoparticles: optimization using RSM-CCD
  4. Leaching behavior of germanium presented in different phases from zinc oxide dust under atmospheric acid leaching conditions
  5. TiO2 P25 and Kronos vlp 7000 materials activated by simulated solar light for atrazine degradation
  6. Numerical investigations on hydrothermal flame characteristics of water-cooled hydrothermal burner
  7. Moving bed biofilm reactor combined with an activated carbon filter for biological nitrate removal
  8. Preparation of bimodal mesoporous CoCe composite oxide for ethanol complete oxidation in air
  9. Hydrocracking of hydrotreated light cycle oil for optimizing BTEX production: a simple kinetic model
  10. Hydrodynamic comparison of different geometries of square cross-section airlift bioreactor using computational fluid dynamics
  11. Influence of different influence parameters on mixing characteristics of silicon particles in cassette
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