水热法制备Bi_(2)WO_(6)及其光催化降解氯贝酸  

Hydrothermal Preparation of Bi_(2)WO_(6)and Its Photocatalytic Degradation of Clofibric Acid

作　　者：王熙 萧子君 王静[1] 李来胜[1] WANG Xi;XIAO Zijun;WANG Jing;LI Laisheng(School of Environment,South China Normal University,Guangzhou 510006,China)

机构地区：[1]华南师范大学环境学院,广州510631

出　　处：《华南师范大学学报（自然科学版）》2023年第5期39-46,共8页Journal of South China Normal University(Natural Science Edition)

基　　金：广东省自然科学基金项目(2022A1515011377)。

摘　　要：通过一步水热法制备具有可见光响应的Bi_(2)WO_(6)光催化材料,采用扫描电镜(SEM)、透射电镜(TEM)、X射线粉末衍射(XRD)、紫外-可见漫反射光谱(UV-Vis DRS)等手段对材料进行表征分析,通过电子顺磁共振谱(ESR)技术对反应活性物质进行表征。以氯贝酸为目标污染物进行光催化性能测试,探究了污染物浓度、催化剂投加量、光电流强度、溶液pH、阴离子和腐殖酸6种因素对光催化性能的影响。实验表明:Bi_(2)WO_(6)材料在可见光下对氯贝酸具有良好的催化效果,并且在污染物浓度为10 mg/L,催化剂投加量为60 mg(0.6 g/L),光电流强度为20 A,在初始溶液pH为5.0和不投加腐植酸的条件下,取得最佳的氯贝酸降解效果。h+和·OH是反应的主要活性氧化物质,材料经历5次循环后光降解率仅下降不到2%。Bi_(2)WO_(6)with visible light response were prepared by a one-step hydrothermal method.The materials were characterized and analyzed by SEM,TEM,XRD and UV-Vis DRS.Reactive substances were characterized by ESR technique.Photocatalytic performance was tested with Clofibric Acid as the target pollutant,and the effects of pollutant concentration,catalyst dosage,current strength,solution pH,anion and Humic Acid presence on the photocatalytic performance were investigated.The experiments showed that the Bi_(2)WO_(6)material had good catalytic effect on Clofibric Acid under visible light and achieved the best degradation under the conditions of pollutant concentration of 10 mg/L,catalyst dosage of 60 mg(0.6 g/L),current intensity of 20 A,initial solution pH of 5.0 and without Humic Acid.h+and·OH were the main active oxidizing substances of the reaction,and the photodegradation rate of the material decreased only less than 2%after five cycles.

关 键 词：Bi_(2)WO_(6) 光催化 氯贝酸 

分 类 号：X522[环境科学与工程—环境工程]