Preparation and adsorption characteristics for heavy metals of active silicon adsorbent from leaching residue of lead-zinc tailings.

Environmental Science and Pollution Research International
Chang LeiXian-Ming Xiao

Abstract

To comprehensively reuse the leaching residue obtained from lead-zinc tailings, an active silicon adsorbent (ASA) was prepared from leaching residue and studied as an adsorbent for copper(II), lead(II), zinc(II), and cadmium(II) in this paper. The ASA was prepared by roasting the leaching residue with either a Na2CO3/residue ratio of 0.6:1 at 700 °C for 1 h or a CaCO3/residue ratio of 0.8:1 at 800 °C for 1 h. Under these conditions, the available SiO2 content of the ASA was more than 20%. The adsorption behaviors of the metal ions onto the ASA were investigated and the Langmuir, Freundlich, and Dubinin-Radushkevich isotherm models were used to analyze the adsorption isotherm. The result showed that the maximum adsorption capacities of copper(II), lead(II), cadmium(II), and zinc(II) calculated by the Langmuir model were 3.40, 2.83, 0.66, and 0.62 mmol g-1, respectively. The FT-IR spectra of the ASA and the mean free adsorption energies indicated that ion exchange was the mechanism of copper(II), lead(II), and cadmium(II) adsorption and that chemical reaction was the mechanism of zinc(II) adsorption. These results provide a method for reusing the leaching residue obtained from lead-zinc tailings and show that the ASA is an effect...Continue Reading

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Citations

Oct 13, 2019·Bulletin of Environmental Contamination and Toxicology·Yangyang WangYansong Wang
Apr 23, 2020·Molecules : a Journal of Synthetic Chemistry and Natural Product Chemistry·Hanzhi LinXianming Xiao
Oct 5, 2020·Ecotoxicology and Environmental Safety·Chang LeiZhi-Ping Fu
Jul 31, 2021·Journal of Hazardous Materials·Nan FangHuicai Cheng

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