文献类型：期刊文献

英文题名：Mechanistic insight and bifunctional study of a sulfide Fe3O4 coated biochar composite for efficient As(III) and Pb(II) immobilization in soils

作者：Wang, Gehui[1];Peng, Cheng[1];Tariq, Muhammad[2];Lin, Sen[1];Wan, Jiang[1];Liang, Weiyu[1];Zhang, Wei[1];Zhang, Lehua[1]

机构：[1]East China Univ Sci & Technol, Sch Resource & Environm Engn, State Environm Protect Key Lab Environm Risk Asse, Shanghai 200237, Peoples R China;[2]Chinese Acad Sci, Suzhou Inst Nanotech & Nanobion, Div Adv Nanomat, Suzhou 215123, Peoples R China

年份：2022

卷号：293

外文期刊名：ENVIRONMENTAL POLLUTION

收录：;EI(收录号：20214811252474);WOS:【SCI-EXPANDED(收录号:WOS:000758393200005)】；

基金：This research was supported by the projects of the National Key Research and Development Program of China (2018YFC1800600, 2019YFC1805200); the National Natural Science Foundation of China (41877124, 21737005).

语种：英文

外文关键词：Simultaneous immobilization; As(III)/Pb(II) contaminated soil; Biochar; Fe3O4; Sulfurization; Mechanistic study

摘要：Trace elements contamination in soil has aroused global concern nowadays, but the efficient, multifunctional, and economically viable method still remains a major challenge. In this research study, a sulfide Fe3O4 coated biochar composite (S/Fe-BC) has been synthesized successfully and applied to As(III)/Pb(II) co-contaminated soil. The immobilization efficiency of S/Fe-BC (2%) for the two elements exceeded 90%, and could ensure the synchronous and efficient immobilization in a wide range of pH (4.0-8.0). The TCLP-As and Pb amounts were sharply dropped after 28 days of stabilization; Meanwhile, a majority of exchangeable and carbonate-bound fractions of As and Pb were transferred into the less accessible residuals. Compared with Fe3O4 coated BC, the good immobilization performance of S/Fe-BC was mainly related to the enhancement of specific surface area, improvement of ionic exchange process, followed by the increase of Pb(II) precipitation and As(III) oxidation. Furthermore, competitive and synergistic effects were observed. In depth characterization analyses revealed the simultaneous immobilization mechanisms involving the adsorption, precipitation (Pb(OH)(2), PbSO4, and PbS), co-precipitation (PbFeAsO4(OH)), and oxidation. Conclusively, outstanding performance of S/Fe-BC composite is considered as a good multifunctional potential candidate for the immobilization of trace elements from a soil system.