ZnO/BiOBr复合材料制备及可见光催化降解RhB性能研究  

Preparation of ZnO/BiOBr Composites and Photocatalytic Degradation of RhB under Visible Light

作　　者：李建会 杨春梅[1] 张彩凤[1,2] 张申 马小红 吴晓婧 王田业 岳秀丽 常敏冉 LI Jianhui;YANG Chunmei;ZHANG Caifeng;ZHANG Shen;MA Xiaohong;WU Xiaojing;WANG Tainye;YUE Xiuli;CHANG Minran(Department of Chemistry,Taiyuan Normal University,Jinzhong,Shanxi 030619,China;Engineering Research Center of Organic Dryland Farming Fertilizer of Shanxi Province,Jinzhong,Shanxi 030619,China)

机构地区：[1]太原师范学院化学系,山西晋中030619 [2]山西省有机旱作农业肥料工程研究中心,山西晋中030619

出　　处：《光子学报》2022年第2期367-376,共10页Acta Photonica Sinica

基　　金：太原师范学院2021年大学生创新创业训练项目(No.CXCY2138);山西省“1331工程”协同创新中心建设计划(No.I1703200)。

摘　　要：通过溶剂热法制备不同ZnO和BiOBr摩尔配比的ZnO/BiOBr复合光催化剂。ZnO与BiOBr摩尔比为1∶2时,ZnO/BiOBr复合材料光催化降解罗丹明B的性能最好,可见光照120 min,罗丹明B(20 mg/L)去除率达98.89%,降解速率常数为0.04050 min^(-1),是纯BiOBr的4倍。紫外-可见漫反射和荧光光谱分析显示较纯ZnO,ZnO/BiOBr(1∶2)吸收带红移,光子利用率提高,且光生电子-空穴复合机率降低。通过电子顺磁共振波谱仪和半导体能带理论对降解机理进行分析,结果显示降解过程主要通过·O_(2)^(-)、·OH自由基的氧化作用,ZnO与BiOBr之间形成界面电场,降低了电子-空穴的复合机会。In the process of industrial production activities such as textile,printing and dyeing,coating and medicine,about 10%~15%of organic pollutants will be discharged into the surrounding water,soil and atmosphere with industrial wastewater,which increases the difficulty of organic dye treatment.Photocatalysis is considered to be one of the most promising technologies to solve the problems of energy shortage and environmental pollution in the future.It has been used to degrade organic pollutants.However,there are still many problems in the application of photocatalysts,such as low photon efficiency,high recombination rate of photoinduced electron hole pairs or poor stability.In order to expand the industrial application of photocatalytic technology,the modification of photocatalyst is an important direction to improve the utilization of solar energy.ZnO has the advantages of good photosensitivity,non toxicity,high electron mobility and low cost,but it is a wide band gap semiconductor,only responds to ultraviolet light,and the photon utilization is low.Bismuth oxyhalide Bi OX(X=Cl,Br,I)has attracted extensive attention because of its special structure and excellent photocatalytic performance.As a typical bismuth halide oxide photocatalyst,Bi OBr has a suitable band gap(2.61 eV),which makes it have the characteristics of good activity and stable photocatalytic performance under visible light irradiation.Therefore,it has become one of the materials that can not be ignored in the field of photocatalytic degradation of water pollution.However,the photocatalytic effect of pure Bi OBr is poor.The combination of Bi OBr and ZnO to form ZnO/Bi OBr heterojunction can improve the photocatalytic activity of single component semiconductor photocatalytic materials and broaden the application range of ZnO and Bi OBr.In previous studies,the binary composite ZnO/Bi OBr was synthesized by hydrothermal method,and the dye degradation experiment was carried out to improve the photocatalytic degradation activity of single component.SHASHA Y

关 键 词：光催化 光子 降解 ZnO/BiOBr 罗丹明B 

分 类 号：O643[理学—物理化学]