Investigating the Adsorption Efficiency of Arsenic in Aqueous Solutions Using Functional Multi-Walled Carbon Nanotubes (MWCNTs-COOH) by Magnetic Method (Fe3O4)

Document Type : Research paper

Authors

1 PhD in Environmental Planning, Faculty of Marine Sciences and Technology, Islamic Azad University, North Tehran Branch, Tehran, Iran.

2 Professor, Department of Earth Sciences, Faculty of Natural Sciences, University of Tabriz, Tabriz, East Azerbaijan, Iran.

3 Professor, Faculty of Marine Sciences and Technology, Islamic Azad University, North Tehran Branch, Tehran, Iran.

4 Associate Professor, Faculty of Civil Engineering and Environmental Engineering, University of Maragheh, East Azerbaijan, Iran.

5 PhD in Hydrogeology, Department of Earth Sciences, Faculty of Natural Sciences, University of Tabriz, Tabriz, East Azerbaijan, Iran.

Abstract

Magnetic separation is widely used to remove contaminants due to its high separation speed and efficiency. The combination of magnetic nanoparticles with other adsorbents not only does not affect their magnetic properties but also leads to the formation of adsorbents that improve the treatment process. In this study, the effectiveness of multi-walled carbon nanotubes magnetized with iron oxide (Fe3O4 (magnetic nanoparticles to remove the heavy metal arsenic from aqueous solutions. The synthesis of Fe3O4-f/MWCNTs was prepared by chemical co-sequestration method, and the physical and structural properties of the adsorbent were analysed by FESEM-EDX, TEM, and XRD techniques. Then, the effect of pH changes (2 - 10), contact time (15 - 240 minutes), adsorbent amount (0.02 - 0.1g), and initial concentration of arsenic (2 - 12 mg/l) was investigated and optimized. The isotherm and kinetics of the reaction were also determined. Results show that the optimal conditions for arsenic removal with magnetic adsorbent are pH= 2, 0.02 g of adsorbent at a concentration of 6 mg/l, and ambient temperature. Also, the fit curves and Freundlich and pseudo-quadratic models were found as optimal isothermal and kinetic models, respectively. The fits of the Freundlich (R2 = 0.9881) and pseudo-second order (R2 =1) models were acceptable.

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References

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Hydrogeology
Volume 10, Issue 1
August 2025
Pages 92-102

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