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Construction of direct z-scheme BPQDs-modified BiOBr thin film for enhanced photocatalytic performance under visible light irradiation

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Journal of Materiomics 2021年第5期7卷 1122-1130页

作者： ziyu Yao Huajun Sun Yunlong Hu Xiaofang Liu Yong zhang State Key Laboratory of Silicate Materials for Architectures Center for Smart Materials and Device IntegrationSchool of Materials Science and EngineeringWuhan University of TechnologyWuhan430070China School of Chemistry Chemical Engineering and Life SciencesWuhan University of TechnologyWuhan430070China Advanced Ceramics Institute of zibo New&High-Tech Industrial Development zone Zibo255000China

Surface modification on photocatalytic thin films is long considered as an effective strategy to improve the degradation performance,which in turn helps to alleviate the worldwide environmental pollution issue.In this study,a direct z-scheme photocatalytic system is constructed successfully by integrating black phosphorus quantum dots(BPQDs)on the surface of BiOBr thin film prepared by hydrothermal method.The optimal BPQDs/BiOBr-1 thin film presents remarkable enhanced photocatalytic activity for degrading methyl violet(MV)and tetracycline hydrochloride(TC),which is 3 and 3.65 times higher than that of pure BiOBr counterpart.The active species involved in the reaction are ^(+),·O_(2)^(-),and·OH,which determined by radical trapping experiments.The formation of direct z-scheme photocatalytic system makes electrons assembled in the conduction band(CB)of BPQDs and holes gathered in the valence band(VB)of BiOBr,which supports the generation of h^(+) and·O_(2)^(-) and in turn accelerates the photocatalytic reaction.Besides,the improved efficiency of charge separation,enhanced visible light absorption and enlarged specific surface area also contributed to the enhanced photocatalytic performance of BPQDs/BiOBr.This work provides a feasible strategy for optimizing photocatalytic thin films via detailed analyzing the role of BPQDs in the construction of direct z-scheme photocatalysts.

关键词： Photocatalytic thin films direct z-scheme Surface modification BPQDs BiOBr

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Theoretical progress on direct z-scheme photocatalysis of two-dimensional heterostructures

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Frontiers of physics 2021年第4期16卷 125-133页

作者： zhaobo zhou Shijun Yuan Jinlan Wang School of Physics Southeast UniversityNanjing 211189China

Two-dimensional(2D)materials,due to its excellent mechanical,unique electrical and optical properties,have become hot materials in the field of photocatalysis.Especially,2D heterostructures can well inhibit the recombination of photogenerated electrons and holes in photocatalysis because of its special energy band structures and carrier transport characteristics,which are conducive to enhancing photoenergy conversion capacity and improving oxidation and reduction ability,so as to purify pollutants and store energy.In this minireview,we summarize recent theoretical progress in direct z-scheme photocatalysis of 2D heterostructures,focusing on physical mechanism and improving catalytic efficiency.Current challenges and prospects for 2D direct z-scheme photocatalysts are discussed as well.

关键词： two-dimensional heterostructures direct z-scheme photocatalyst density functional theory

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Room-temperature solid phase surface engineering of BiOI sheets stacking g-C_(3)N_(4) boosts photocatalytic reduction of Cr(Ⅵ)

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Green Energy & Environment 2022年第1期7卷 66-74页

作者： 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 EngineeringHarbin Institute of TechnologyHarbinHeilongjiang150001China State Key Laboratory of Urban Water Resource and Environment School of EnvironmentHarbin Institute of TechnologyHarbinHeilongjiang150090China

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-C_(3)N_(4)(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.O_(2)^(-)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 photocatalyst heterostructure to reduce Cr(Ⅵ)to Cr(Ⅲ).

关键词： BiOI/g-C_(3)N_(4) Photocatalytic reduction Solid phase direct z-scheme Cr(Ⅵ)reduction

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