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Magnetization of Bauxite Residue to Enhance the Removal Efficiency Towards Heavy Metals

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Abstract

Bauxite residues are a mass of industrial wastes derived from aluminum metallurgy. This work provided a simple pyrolysis method to magnetize the bauxite residue to serve as a magnetic adsorbent towards heavy metals removal. The X-ray diffraction patterns and Mossbauer spectrum results confirmed the partial reduction of iron species with an obvious enhancement in magnetization. The magnetized bauxite residue exhibited excellent removal efficiencies for Cu2+, Cd2+ and Pb2+ with maximum adsorption capacities of 219.0 mg g−1, 275.4 mg g−1, and 100.4 mg g−1, which could be quickly separated through a magnet. The adsorption equilibrium data were fitted to the Langmuir isotherm model, while the adsorption kinetics followed a pseudo-first-order model. According to the characterization results, chemical precipitation and sorption was the major mechanism for the removal of Cu2+, Pb2+, and Cd2+. Thus, the magnetized bauxite residue exhibited promising applications for heavy metals removal in wastewater.

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Acknowledgements

This work was supported by the National Key Research and Development Program of China (No. 2019YFC1803603), the National Natural Science Foundation of China (No. 42177391), and the Fundamental Research Funds for the Central Universities of Central South University.

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Correspondence to Jun Jiang or Dewen He.

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Li, C., Zhou, J., Jiang, J. et al. Magnetization of Bauxite Residue to Enhance the Removal Efficiency Towards Heavy Metals. Bull Environ Contam Toxicol 109, 51–60 (2022). https://doi.org/10.1007/s00128-022-03508-4

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  • DOI: https://doi.org/10.1007/s00128-022-03508-4

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