Abstract
In this paper, FeS nanopowder was successfully synthesized through a facile mechano-chemical method from FeS2 mineral and Fe powders as the adsorbent of cadmium ions from an aqueous solution. The results confirmed FeS nanopowder formation with a mean particle size of about 90 nm and a specific surface area of 15 m2/g. The adsorption behavior of cadmium onto FeS was evaluated using response surface methodology to study the effects of pH, adsorbent dosage, and contact time parameters on the efficiency of the removal process. In optimized conditions with the initial cadmium concentration of 100 mg/L, the maximum removal efficiencies of cadmium at the pH values of 2 and 6 were found to be 94 and 75%, respectively. Langmuir model describes the adsorption equilibrium data, and the pseudo-second-order model describes the kinetics. The calculated activation energy indicated chemical adsorption as the predominant phenomenon. Besides, the major removal mechanism of cadmium at a pH of 2 was ion exchange. Regarding the thermodynamic parameters, the cadmium adsorption was endothermic and spontaneous. The results showed the simple synthesis of FeS nanopowder adsorbent and promising removal efficiency in cadmium-polluted wastewater. Besides, the considerable potential of synthesized FeS nanopowder in photocatalytic removal of cadmium ions under visible light irradiation from wastewater indicates that the rate constant has been enhanced almost four times in the photocatalysis process.
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This research was carried out in 2021–2022 in the School of Metallurgy and Materials Engineering, University of Tehran. The authors would like to acknowledge the support of the University of Tehran.
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Zarezadeh, K., Soori, M., Sheibani, S. et al. Removal of cadmium through adsorption and visible light photocatalysis from polluted wastewater by mechano-chemically synthesized FeS nanopowder. Int. J. Environ. Sci. Technol. 21, 315–328 (2024). https://doi.org/10.1007/s13762-023-05225-9
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DOI: https://doi.org/10.1007/s13762-023-05225-9