三维阶层结构BiOBr/Bi_(2)WO_(6)多孔微球制备及其对盐酸四环素的可见光催化降解性能  

Preparation of Three-dimensional Hierarchical BiOBr/Bi_(2)WO_(6) Porous Microsphere and Its Visible-light Photocatalytic Degradation for Tetracycline Hydrochloride

作　　者：张畅滕 申乾宏[1] 郑素华 黄飞龙 张昕宇 吴春春[1] 杨辉[1] ZHANG Changteng;SHEN Qianhong;ZHENG Suhua;HUANG Feilong;ZHANG Xinyu;WU Chunchun;YANG Hui(School of Materials Science and Engineering,Zhejiang University,Hangzhou 310007,China)

机构地区：[1]浙江大学材料科学与工程学院,浙江杭州310007

出　　处：《材料科学与工程学报》2022年第4期567-574,共8页Journal of Materials Science and Engineering

基　　金：国家重点研发计划资助项目(2018YFD1101003);浙江省重点研发计划资助项目(2018C04007)。

摘　　要：采用溶剂热法制备了BiOBr/Bi_(2)WO_(6)复合材料,运用X射线衍射(XRD)、扫描电子显微镜(SEM)、紫外-可见漫反射光谱(DRS)、荧光光谱(PL)等测试方法分析了样品的结构形貌及光学性质,通过盐酸四环素的可见光催化降解反应评价材料的光催化性能,并对BiOBr/Bi_(2)WO_(6)复合材料的光催化活性增强机制进行了探讨。结果表明:BiOBr/Bi_(2)WO_(6)复合材料的微观形貌为BiOBr纳米片与Bi_(2)WO_(6)纳米片组装而成的具有三维阶层结构的多孔微球。具有这种独特结构的微球表现出较强的吸附能力以及对可见光较高的利用效率,同时BiOBr与Bi_(2)WO_(6)在纳米尺度上形成的异质结有效促进了光生载流子的分离,显著提高了复合材料的可见光催化活性。BiOBr/Bi_(2)WO_(6)多孔微球在低强度LED可见光(5W,400nm)辐照1h后,对盐酸四环素的降解率高达87.5%,其光催化活性分别是单一Bi_(2)WO_(6)纳米片及BiOBr微球的2.7倍和1.9倍。BiOBr/Bi_(2)WO_(6) composite was prepared by solvothermal method,and XRD,SEM,DRS,PL were adopted to analyze the structure,morphology and optical properties of the samples.The photocatalytic activity of the material was evaluated by the photocatalytic degradation reaction of tetracycline hydrochloride under visible-light irradiation,and the enhancement mechanism of the photocatalytic activity of BiOBr/Bi_(2)WO_(6) composite was discussed.The results show that the micro morphology of the BiOBr/Bi_(2)WO_(6) composite material presents a porous microsphere with a three-dimensional hierarchical structure assembled by BiOBr nanosheets and Bi_(2)WO_(6) nanosheets.The microspheres with such unique structure show strong adsorption capacity and high utilization efficiency of visible light.At the same time,the nano-scale heterojunction formed by BiOBr and Bi_(2)WO_(6) effectively promotes the separation of photo-generated carriers,and thus significantly improving the visible-light photocatalytic activity of the composite material.Under the irradiation of low-intensity LED visible light(5 W,400 nm)for 1 hour,the degradation rate of tetracycline hydrochloride over BiOBr/Bi_(2)WO_(6) porous microspheres is as high as 87.5%,and the photocatalytic activity of the composite is 2.7 times and 1.9 times of pure Bi_(2)WO_(6) nanosheets and pure BiOBr microspheres,respectively.

关 键 词：BiOBr/Bi_(2)WO_(6) 阶层结构 多孔微球 溶剂热法 可见光催化 

分 类 号：TQ135.32[化学工程—无机化工]