海泡石
环境修复
吸附
弗伦德利希方程
解吸
镉
化学
土壤污染
环境化学
朗缪尔
水溶液
污染
阳离子交换容量
朗缪尔吸附模型
土壤水分
环境工程
环境科学
土壤科学
有机化学
生态学
原材料
生物
作者
Feng Zhou,Guangyu Ye,Yuting Gao,Hongquan Wang,Sen Zhou,Yi Liu
标识
DOI:10.1016/j.jhazmat.2021.127104
摘要
Soils contamination with Cd result in detriment to the environmental quality. In-situ immobilization methods by applying clay minerals have been gaining prominence. The effects on sepiolite of thermal activation at different temperatures (300-750 °C), for removing Cd from aqueous solutions were evaluated, in order to consider their further application for soil remediation. The influence of activation temperature was investigated using XRD, SEM, and N2 adsorption-desorption measurements. The S-600 exhibited the maximum adsorption capacity (21.28 mg/g), despite its lower SSA, and Langmuir model described the adsorption isotherms better than the Freundlich equation. TCLP was used to quantify the remediation effects of thermal-activated sepiolite on simulated soils artificially polluted with Cd. The results indicated that the mobility of Cd in soil was effectively reduced after treating with thermal-activated sepiolite and the use of S-600 was the most efficient, reducing the TCLP-Cd by approximately 73% compared with the control test. The main remediation mechanism was considered as the cation exchange of Cd by Mg at the edges of octahedral sheet. This study showed that thermal-activated sepiolite could be promising amendments for remediation of Cd-contaminated soil.
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