Jiang Xueqin, Liu Zhenyuan, Yan Bo, Zhao Lingzhi, Chen Tao, Yang Xiaofan
Guangdong Engineering Technology Research Center of Low Carbon and Advanced Energy Materials, Guangdong Provincial Key Laboratory of Chip and Integration Technology, School of Semiconductor Science and Technology, South China Normal University, Foshan 528225, China; SCNU Environmental Research Institute, Guangdong Provincial Key Laboratory of Chemical Pollution and Environmental Safety & MOE Key Laboratory of Theoretical Chemistry of Environment, Guangdong Engineering Technology Research Center for Source Control of Combined Pollution in Mining Areas, School of Environment, South China Normal University, Guangzhou 510006, China.
SCNU Environmental Research Institute, Guangdong Provincial Key Laboratory of Chemical Pollution and Environmental Safety & MOE Key Laboratory of Theoretical Chemistry of Environment, Guangdong Engineering Technology Research Center for Source Control of Combined Pollution in Mining Areas, School of Environment, South China Normal University, Guangzhou 510006, China.
J Hazard Mater. 2024 Oct 5;478:135614. doi: 10.1016/j.jhazmat.2024.135614. Epub 2024 Aug 23.
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.
在本研究中，基于高温碱熔技术，通过对铅锌（Pb-Zn）尾矿的酸浸渣（APR）进行处理制备了一种高硅（Si）吸附剂（APR@Sam）。将合成的硅基材料应用于受铅和镉（Cd）污染的水溶液中，以研究活性硅在螯合重金属中的关键作用。在不同的pH值和温度条件下研究了APR@Sam和贫硅材料（APR@Sam-NSi）的吸附容量。结果表明，随着pH值从3增加到7，吸附容量增加，溶液中活性硅含量增加了63%，吸附后溶液的最大pH值为7.12。去除活性硅后，APR@Sam对Pb（II）和Cd（II）的吸附容量分别下降了45%和11.96%。OH-促进了硅向溶液中的释放，提高了材料的吸附效率。反应机理主要归因于由Si-O和Si-O-Si键引导的表面络合、金属阳离子交换和双齿配位。结果表明，硅组分对于APR@Sam去除Pb（II）和Cd（II）至关重要，并为从浸出残渣中回收资源的策略提供了有价值的见解。
