Journal
BULLETIN OF ENVIRONMENTAL CONTAMINATION AND TOXICOLOGY
Volume 109, Issue 1, Pages 51-60Publisher
SPRINGER
DOI: 10.1007/s00128-022-03508-4
Keywords
Bauxite residue; Magnetic adsorbent; Heavy metals; Pyrolysis; Adsorption mechanism
Categories
Funding
- National Key Research and Development Program of China [2019YFC1803603]
- National Natural Science Foundation of China [42177391]
- Fundamental Research Funds for the Central Universities of Central South University
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This study provides a simple method to magnetize bauxite residues for the removal of heavy metals, showing excellent removal efficiency and separation performance.
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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