Effects of active silicon amendment on Pb(II)/Cd(II) adsorption: performance evaluation and mechanism

水溶液 浸出(土壤学) 吸附 化学 金属 无机化学 核化学 有机化学 土壤水分 环境科学 土壤科学
作者
Xueqin Jiang,Zhenyuan Liu,Bo Yan,Lingzhi Zhao,Tao Chen,Xiaofan Yang
出处
期刊:Journal of Hazardous Materials [Elsevier BV]
卷期号:478: 135614-135614 被引量:9
标识
DOI:10.1016/j.jhazmat.2024.135614
摘要

In this study, a high-Si (Si) adsorbent (APR@Sam) was prepared by acid leaching slag (APR) from lead-zinc (Pb-Zn) tailings based on high-temperature alkali melting technology. The synthesized Si-based materials were applied to aqueous solutions contaminated with Pb and cadmium (Cd) to investigate the crucial role of active Si in sequestering heavy metals. The adsorption capacities of APR@Sam and the Si-depleted material (APR@Sam-NSi) were studied under different pH and temperature conditions. The results showed that as the pH increased from 3 to 7, the adsorption capacity increased, the active Si content in the solution increased by 63 %, and the maximum pH of the solution after adsorption was 7.12. After the removal of active Si, the Pb (II) and Cd (II) adsorption capacities of APR@Sam decreased by 45 % and 11.96 %, respectively. OH- promoted the release of Si into the solution, enhancing the material's adsorption efficiency. The reaction mechanism is mainly attributed to surface complexation guided by Si-O and Si-O-Si bonds, metal cation exchange, and bidentate coordination. The results indicated that the Si component is critical for the removal of Pb (II) and Cd (II) by APR@Sam and provide valuable insights into resource recovery strategies from leaching residues.
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