Cr(VI)-based compounds pollution have attracted global concern due to serious harm to humans and environment. Hence, it is crucial to exploit an effective technique to eliminate Cr(VI) in water. Herein, we in-situ grown BiOI on graphitic carbon nitride to prepare the BiOI/g-C3N4 (BCN) direct Z-scheme heterojunction by solid phase engineering method at room temperature. Experimental result shown the photocatalytic activity of pure BiOI were obviously enhanced by constructing Z-scheme BCN heterostructure, and BCN-3 heterostructure exhibited the optimal photocatalytic degradation of RhB with 98％yield for 2.5 h and reduction of Cr(VI) with more than 99％yield for 1.5 h at pH=2. Stability test shows BCN-3 still kept more than 98％reduction efficiency after 6 cycles. In addition, we also studied the reduction mechanism that shown the ·O2-radicals essentially helped to reduce the Cr(VI) in aqueous solution under illumination, verified the direct Z-scheme charge transfer path by X-ray photoelectron spectroscopy (XPS) and the free radical trapping experiment. The work open a new way for rationally designing photo-catalyst heterostructure to reduce Cr(VI) to Cr(III).

Xin Zhang;Weiwei Yang;Manyi Gao;Hu Liu;Kefei Li;Yongsheng Yu

MIIT Key Laboratory of Critical Materials Technology for New Energy Conversion and Storage,School of Chemistry and Chemical Engineering,Harbin Institute of Technology,Harbin,Heilongjiang,150001,China;State Key Laboratory of Urban Water Resource and Environment,School of Environment,Harbin Institute of Technology,Harbin,Heilongjiang,150090,China

绿色能源与环境（英文）

[1]Xin Zhang;Weiwei Yang;Manyi Gao;Hu Liu;Kefei Li;Yongsheng Yu-.Room-temperature solid phase surface engineering of BiOI sheets stacking g-C3N4 boosts photocatalytic reduction of Cr(VI))[J].绿色能源与环境（英文）,2022(01):66-74

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