标题：Immobilization of cadmium by mercapto-functionalized palygorskite under stimulated acid rain: Stability performance and micro-ecological response

入藏号：WOS:000860792700004

中国科学院文献情报中心期刊分区：环境科学与生态学2区/TOP（2022)

本校作者：李佳; 吴斌*; 罗治; 雷泞菲, 匡鸿杰; 李子清

来源出版物：ENVIRONMENTAL POLLUTION  卷: 306  文献号: 119400

出版年：2022

第一地址： 成都理工大学

关键词： Immobilization；Cadmium；Mercapto-functionalized palygorskite；Micro-ecology；Acid rain

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摘要：The interaction of cadmium (Cd) pollution and acid rain stress has seriously threatened soil ecosystem andhuman health. However, there are still few effective amendments for the in-situ remediation in the Cdcontaminatedacidified soil. In this study, the performance and mechanisms of palygorskite (PAL) andmercapto-functionalized PAL (MPAL) on Cd immobilization were investigated, and the stability as well as effectson soil micro-ecology under stimulated acid rain were also explored. Results showed that MPAL could react withCd to form stable Cd-sulfhydryl and Cd–O complexes. The reduction of bioavailable Cd by MPAL was121.19–164.86% higher than that by PAL. Notably, the Cd immobilization by MPAL remained stable within 90days in which the concentrations of HOAc-extractable Cd were reduced by 18.28–25.12%, while the reducibleand residual fractions were increased by 9.26–18.53% and 54.16%–479.01%, respectively. The sequential acidrain leaching demonstrated that soil after MPAL treatments had a strong H+ resistance, and the immobilized Cdshowed prominent stability. In addition, activities of acid phosphatase, catalase and invertase in MPAL treatedsoil were significantly enhanced by 34.60%, 22.09% and 48.87%, respectively. After MPAL application, bacterialdiversity was further improved with diversified sulfur metabolism biomarkers. The decreased abundance of Cdresistance genes including cadA, cadC, czcA, czcB, czcR and zipA also indicated that soil micro-ecology wasimproved by MPAL. These results showed that MPAL was an effective and eco-friendly amendment for theimmobilization of Cd in contaminated soil.

文章链接地址: https://linkinghub.elsevier.com/retrieve/pii/S0269749122006145