文献类型：期刊文献

英文题名：Bifunctional 2D K-SnS for One-Pot Photocatalytic Reduction of Cr(VI) and In Situ Ion-Exchange Recycle of Product Cr(III)

作者：Deng, Xiaoming[1,2,3];Wu, Zhuohan[4];Yin, Bolin[2,3];Lei, Jia[2,3];Bian, Zhenfeng[2,3];Li, Hexing[1,2,3]

机构：[1]East China Univ Sci & Technol, Sch Chem & Mol Engn, Shanghai 200237, Peoples R China;[2]Shanghai Normal Univ, Key Lab Resource Chem, Educ Minist, Shanghai 200234, Peoples R China;[3]Shanghai Normal Univ, Shanghai Key Lab Rare Earth Funct Mat, Shanghai 200234, Peoples R China;[4]East China Univ Sci & Technol, Sch Mat Sci & Engn, Shanghai 200237, Peoples R China

年份：2025

卷号：5

期号：6

起止页码：1430

外文期刊名：ACS ES&T ENGINEERING

收录：WOS:【ESCI(收录号:WOS:001435186400001)】；

基金：This work was supported by the National Key Research and Development Program of China (2020YFA0211004), the National Natural Science Foundation of China (22236005 and 22176128), the Innovation Program of Shanghai Municipal Education Commission (2023ZKZD50), Program of Shanghai Academic Research Leader (21XD1422800), Shanghai Government (22dz1205400 and 23520711100), Shanghai Leading Talent Program of Eastern Talent Plan (LJ2023002), Chinese Education Ministry Key Laboratory and International Joint Laboratory on Resource Chemistry (IJLRC), and Shanghai Eastern Scholar Program. The authors also thank the "111 Innovation and Talent Recruitment Base on Photochemical and Energy Materials" (no. D18020), Shanghai Engineering Research Center of Green Energy Chemical Engineering (18DZ2254200), and Shanghai Frontiers Science Center of Biomimetic Catalysis.

语种：英文

外文关键词：2D K-SnS; hexavalent chromium; photocatalytic; ion-exchange; Cr recycling

摘要：Remediating industrial wastewater containing Cr(VI) is crucial to addressing environmental and health challenges posed by heavy-metal pollution. However, the product Cr(III) may cause secondary pollution and even photocatalyst poisoning. In this study, we developed a two-dimensional bifunctional photocatalyst, K2n [Sn3S7] n (2D K-SnS), to achieve Cr(VI) reduction and Cr(III) sequestration simultaneously via photocatalysis under visible-light irradiation and ion-exchange conditions, respectively. A reduction efficiency of 30 ppm Cr(VI) could reach up to 99.3%. The product Cr(III) could potentially be stored inside the [Sn3S7] n 2n- framework by in situ ion exchange with the filled K+; this was followed by recycling through reversible ion exchange in KCl solution with the total Cr recycling rate reaching nearly 90%. Furthermore, the photocatalyst demonstrated excellent stability, retaining high activity (as measured by a total Cr removal efficiency above 95%) after reversible ion-exchange. The structural and functional attributes of 2D K-SnS ensure efficient Cr(VI) detoxification while minimizing secondary pollution. Ultimately, this study presents a sustainable strategy for treating industrial wastewater via combining heavy-metal ion removal with resource recovery. The study's findings highlight the potential uses of photocatalytic materials in practical environmental applications.