Greatly increased visible-light photocatalytic activity of SnS_(2)/carbon nanotube composite for Cr(VI)reduction:Insights into effects of solid acid structure

作     者：Zhen Wan Qihang Mao Jingjing Xiang Dongge Ma Heqing Tang Zhen Wan;Qihang Mao;Jingjing Xiang;Dongge Ma;Heqing Tang

作者机构：Key Laboratory of Catalysis and Materials Science of the State Ethnic Affairs Commission and Ministry of EducationCollege of Resources and Environmental ScienceSouth-Central Minzu UniversityWuhan 430074China Department of ChemistryCollege of Chemistry and Materials EngineeringBeijing Technology and Business UniversityBeijing 100048China 

出 版 物：《Journal of Materials Science & Technology》 (材料科学技术（英文版）)

年 卷 期：2023年第161卷第30期

页      面：233-244页

核心收录：

学科分类：08[工学] 0805[工学-材料科学与工程（可授工学、理学学位）] 080502[工学-材料学] 0802[工学-机械工程] 0703[理学-化学] 0702[理学-物理学] 

基　　金：This work was financially supported by the National Natural Science Foundation of China(Nos.21906184,22076007) the Fundamental Research Funds for the Central Universities,South-Central University for Nationalities(No.CZQ23008) 

主　　题：SnS_(2)/CNT composite S-C p-πbonding Solid acid Ball milling Cr(VI)reduction 

摘      要：A composite of SnS_(2)and carbon nanotube(CNT)was successfully synthesized as a visible-light-driven photocatalyst with a mechanochemical *** comparing with SnS_(2),the SnS_(2)/CNT composite im-proved much the photocatalytic removal of Cr(VI)in acidic condition,which was confirmed to its special solid acid *** the synthesis of the SnS_(2)/CNT composite by ball milling,S-C p-πbonding was formed between sulfur atoms in SnS_(2)and carbon atoms in *** generated S-C p-πbonding enhanced the transfer of photo-induced electrons in the bulk phase of the composite photocatalyst un-der visible light ***,the persistent radical sites on CNT were able to trap photo-induced electrons and served as conjugated acid sites in the photocatalysis,which increased surface concentration of protons through their association with H+.These made the catalyst have a solid acid structure with plentiful surface protons,promoting the interfacial electron transfer between the catalysts and Cr(VI)and increasing the source of H+for the reduction of Cr(VI).As a result,the photocatalytic reduction rate of Cr(VI)on the SnS_(2)/CNT composite were dramatically enhanced,being about 800%that on SnS_(2).On the basis of various characterizations and probe experiments,we confirmed the significance of the solid acid structure of the photocatalyst and clarified the catalytic mechanism of the new *** finding may provide a new strategy to prepare highly active photocatalysts for proton-involved reactions.