Regulating Electron-Hole Separation to Promote the Photocatalytic Property of BiOBr_1−xI_x/BiOBr Local Distorted Hierarchical Microspheres  

作　　者：Rui Cheng Yan Zhang Yanhua Peng Xiaolong Yang Jianqiang Yu Zhaoguang Nie Rui Cheng;Yan Zhang;Yanhua Peng;Xiaolong Yang;Jianqiang Yu;Zhaoguang Nie(School of Chemistry and Chemical Engineering, Qingdao University, Qingdao, China)

机构地区：[1]School of Chemistry and Chemical Engineering, Qingdao University, Qingdao, China

出　　处：《Modern Research in Catalysis》2021年第2期36-55,共20页催化剂现代研究（英文）

摘　　要：In this work, hierarchical BiOBr_{1<span style="white-space:nowrap;">&#8722</span>x}I_x/BiOBr heterojunction photocatalyst with a microsphere morphology was synthesized by a facile solvothermal process. It demonstrated that the local structure of the photocatalysts was highly distorted due to the substitution of bromide ions by iodine ions. The photocatalytic properties were evaluated by the photodecomposition of aqueous phenol solution under visible-light irradiation. The results indicated that all the composite photocatalysts exhibited high photocatalytic activity. In particularly, the BiOBr_{1<span style="white-space:nowrap;">&#8722</span>x}I_x/BiOBr (x = 0.25) sample exhibited over 92% degradation efficiency of phenol within 150 min, which is 24.6 and 3.08 fold enhancement in the photocatalytic activity over the pure phased BiOBr and BiOI, respectively. Moreover, this excellent photocatalytic property can be expanded to other colorless organic contaminants, verifying the common applicability of BiOBr_{1<span style="white-space:nowrap;">&#8722</span>x}I_x/BiOBr (x = 0.25) as an excellent visible-light photocatalyst for organics decomposition. The significant improvement in the photocatalytic activity can be explained by the high efficiency of charge separation due to the enhancement in the internal electric fields and band match that comes from the local structure distortion. This work provides valuable information for the design of highly active photocatalysts toward the environmental remediation.In this work, hierarchical BiOBr_{1<span style="white-space:nowrap;">&#8722</span>x}I_x/BiOBr heterojunction photocatalyst with a microsphere morphology was synthesized by a facile solvothermal process. It demonstrated that the local structure of the photocatalysts was highly distorted due to the substitution of bromide ions by iodine ions. The photocatalytic properties were evaluated by the photodecomposition of aqueous phenol solution under visible-light irradiation. The results indicated that all the composite photocatalysts exhibited high photocatalytic activity. In particularly, the BiOBr_{1<span style="white-space:nowrap;">&#8722</span>x}I_x/BiOBr (x = 0.25) sample exhibited over 92% degradation efficiency of phenol within 150 min, which is 24.6 and 3.08 fold enhancement in the photocatalytic activity over the pure phased BiOBr and BiOI, respectively. Moreover, this excellent photocatalytic property can be expanded to other colorless organic contaminants, verifying the common applicability of BiOBr_{1<span style="white-space:nowrap;">&#8722</span>x}I_x/BiOBr (x = 0.25) as an excellent visible-light photocatalyst for organics decomposition. The significant improvement in the photocatalytic activity can be explained by the high efficiency of charge separation due to the enhancement in the internal electric fields and band match that comes from the local structure distortion. This work provides valuable information for the design of highly active photocatalysts toward the environmental remediation.

关 键 词：BiOBr Iodine Ions Doping Enhanced Photocatalytic Property Phenol Decomposition Local Structure Distortion 

分 类 号：O64[理学—物理化学]