摘要
为获得光催化活性强、磁稳定性高且可快速磁分离的多功能铋系光催化材料,以磁性膨润土(Magnetic bentonite,MB)为载体,十二烷基苯磺酸钠(Sodium dodecylbenzene sulfonate,SDBS)为表面修饰剂,采用载体负载、半导体复合以及表面活性剂调控形貌等手段对溴氧化铋(Bismuth bromide,BiOBr)进行改性,快速合成花球状SDBS修饰的磁性膨润土基负载溴氧化铋(SDBS/BiOBr-MB)复合光催化材料。同时,利用多种表征技术对SDBS/BiOBr-MB进行形貌结构特性分析,并以罗丹明B(Rhodamine B,RhB)为目标污染物,考察SDBS/BiOBr-MB的可见光催化活性。研究结果表明,SDBS/BiOBr-MB具有的花球状形貌提高了材料对可见光的吸收利用;同时Fe 3O 4@BiOBr异质结促进了光生载流子的分离;此外,磁性膨润土的引入减少了主体催化剂BiOBr的团聚并实现了快速磁分离回收,五次循环使用后复合光催化剂仍具有良好的可见光催化活性,对RhB的降解率达到92%。本研究可为BiOBr及其他可见光催化剂的集成改性提供有益的参考。
To obtain multifunctional bismuth series photocatalytic materials with strong photocatalytic activity,superior magnetic stability and effective magnetic separation,Bismuth bromide oxide(BiOBr)was organically modified by sodium dodecylbenzene sulfonate(SDBS)and carried by magnetic bentonite(MB).Flower-like spherical SDBS modified MB-based supported BiOBr(SDBS/BiOBr-MB)composite photocatalyst was successfully synthesized by synthesizing some methods of load modification,semiconductors coupling and morphology control.Subsequently,the synthesized samples were characterized by a series of characterization technologies and the photocatalytic performance was investigated by Rhodamine B(RhB)under visible light irradiation.The experimental results confirmed the flower-like spherical SDBS/BiOBr-MB boosted absorption and utilization of visible light.While the effective separation of photogenerated carriers can be achieved due to Fe 3O 4@BiOBr heterojunction.In addition,the introduction of MB effectively reduced agglomeration of BiOBr and achieved efficiently solid-liquid separation by an external magnet.After five recycles,the SDBS/BiOBr-MB photocatalyst still exhibited high photocatalytic activity and stability for RhB(92%)under visible-light irradiation.Therefore,this study can provide valuable reference for the integrated modification of BiOBr and other visible-light photocatalysts.
作者
黄国富
刘坤
王忠凯
宋蓉蓉
朱颖
汤睿
张寒冰
童张法
HUANG Guofu;LIU Kun;WANG Zhongkai;SONG Rongrong;ZHU Ying;TANG Rui;ZHANG Hanbing;TONG Zhangfa(College of Resources,Environment and Materials,Guangxi University,Nanning 530004,China;Guangxi Key Laboratory of Petrochemical Resource Processing and Process Intensification Technology,School of Chemistry and Chemical Engineering,Guangxi University,Nanning 530004,China)
出处
《材料导报》
EI
CAS
CSCD
北大核心
2020年第22期22024-22029,共6页
Materials Reports
基金
国家自然科学基金(21576055)
广西石化资源加工及过程强化技术重点实验室主任课题(2018Z004)。
关键词
有机修饰
溴氧化铋
磁性膨润土
十二烷基苯磺酸钠
形貌调控
异质结
光催化
organic modification
bismuth bromide(BiOBr)
magnetic bentonite
sodium dodecylbenzene sulfonate(SDBS)
morphology control
heterojunction
photocatalysis
