S-scheme heterojunction photocatalysts have been the"stars"in the field of photocatalysis.Herein,a novel S-scheme heterojunction of Ta3N5/BiOCl with oxygen vacancies(OVs)was fabricated via a facile method.The charge separation and transport mechanism of this Ta3N5/BiOCl S-scheme heterojunction was verified by the analyses of band energy structures,active species,photoelectric behaviors and DFT theoretical calculation.Compared with Ta3N5 and BiOCl,the Ta3N5/BiOCl unveils substantially upgraded photocatalytic property under visible light,and the photocatalytic efficiency for removal of tetracycline(TC)and hexavalent chromium(Cr(Ⅵ))reaches 89.6％and 91.6％,respectively.The substantial enhance-ment of the photocatalytic activity is attributed to the synergistic effect of the S-scheme hetero-structure and oxygen vacancies,which improves the visible-light absorption,while promoting the spatial separation of charge carriers with the optimum redox capacity,thereby boosting the production of active species for catalytic reactions.The TC degradation pathway is deduced and the toxicity evolution of TC is appraised using the QSAR method.In a nutshell,this work gives a deep understanding of the photocatalytic mech-anism based on Ta3N5/BiOCl as well as presents a newfangled thought for developing highly efficient S-scheme heterojunction photocatalysts for water decontamination.

Shijie Li;Mingjie Cai;Chunchun Wang;Yanping Liu;Neng Li;Peng Zhang;Xin Li

Key Laboratory of Health Risk Factors for Seafood of Zhejiang Province,National Engineering Research Center for Marine Aquaculture,College of Marine Science and Technology,Zhejiang Ocean University,Zhoushan 316022,China;Institute of Innovation&Application,Zhejiang Ocean University,Zhoushan 316022,China;State Key Laboratory of Silicate Materials for Architectures,Wuhan University of Technology,Wuhan 430070,China;State Center for International Cooperation on Designer Low-Carbon&Environmental Materials(CDLCEM),School of Materials Science and Engineering,Zhengzhou University,Zhengzhou 450001,China;Institute of Biomass Engineering,Key Laboratory of Energy Plants Resource and Utilization,Ministry of Agriculture and Rural Affairs,South China Agricultural University,Guangzhou 510642,China

材料科学技术（英文版）

[1]Shijie Li;Mingjie Cai;Chunchun Wang;Yanping Liu;Neng Li;Peng Zhang;Xin Li-.Rationally designed Ta3N5/BiOCl S-scheme heterojunction with oxygen vacancies for elimination of tetracycline antibiotic and Cr(Ⅵ):Performance,toxicity evaluation and mechanism insight)[J].材料科学技术（英文版）,2022(28):177-190

Ta3N5

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