摘要
通过溶剂热和超声搅拌合成了CeO_(2)/BiOI/g-C_(3)N_(4)三相复合材料。利用XRD、SEM、TEM和UV-Vis DRS等手段对该材料的成分、结构和光学性质进行表征。制备的CeO_(2)/BiOI/g-C_(3)N_(4)三相复合材料界面结构构建良好,光响应性能好,各相分布均匀且结晶程度较高。光催化降解实验表明,在可见光(λ>420 nm)下,CeO_(2)/BiOI/g-C_(3)N_(4)(Ce、Bi物质的量比为2∶1,g-C_(3)N_(4)质量分数为5%)三相复合材料光催化降解RhB的效率达到71%,是纯相CeO_(2)的7倍、纯相BiOI的10倍。同时光催化重复实验结果表明,光催化材料显示出良好的稳定性,经四次循环后,光催化效率基本无降低。最后探讨了复合材料的光催化机理,明确光催化实验中真正的活性物质为空穴及超氧自由基。
The CeO_(2)/BiOI/g-C_(3)N_(4)composites were synthesized by solvothermal and ultrasonic stirring method.The composition,microstructure and optical properties of the material were characterized by XRD,SEM,TEM and UV-Vis DRS.The obtained CeO_(2)/BiOI/g-C_(3)N_(4)has tighter interface structure,good light response property,uniform phase distribution and high degree of crystallization.Photocatalytic degradation experiments showed that under visible light(λ>420 nm),the photocatalytic degradation efficiency of CeO_(2)/BiOI/g-C_(3)N_(4)(Ce/Bi molar ratio was 2∶1,and g-C_(3)N_(4)mass fraction was 5%)for RhB was 71%,which was 7 times that of pure CeO_(2)and 10 times that of pure BiOI.The sample remained high photocatalytic efficiency after four cycles,revealing its good circulatory stability.Finally,the photocatalytic mechanism of the composites was introduced.It was clear that the real active substances in the photocatalytic experiment were holes and superoxide radicals.
作者
曹一达
刘成宝
陈丰
钱君超
许小静
孟宪荣
陈志刚
CAO Yida;LIU Chengbao;CHEN Feng;QIAN Junchao;XU Xiaojing;MENG Xianrong;CHEN Zhigang(Jiangsu Key Laboratory for Environment Functional Materials,Suzhou University of Science and Technology,Suzhou 215009,Jiangsu,China;School of Materials Science and Engineering,Suzhou University of Science and Technology,Suzhou 215009,Jiangsu,China;Jiangsu Collaborative Innovation Center of Technology and Material for Water Treatment,Suzhou University of Science and Technology,Suzhou 215009,Jiangsu,China;Jiangsu Province Ceramics Research Institute Co.,Ltd.,Yixing 214221,Jiangsu,China;Suzhou Institute of Environmental Science,Suzhou 215007,Jiangsu,China)
出处
《材料导报》
EI
CAS
CSCD
北大核心
2023年第3期132-138,共7页
Materials Reports
基金
江苏省自然科学基金(BK20180103,BK20180971)
苏州市科技发展计划项目(民生科技—关键技术应用研究)(SS202036)。
关键词
碘氧化铋
复合光催化材料
构筑异质结
光催化降解
BiOI
composite photocatalytic material
heterojunction construction
photocatalytic degradation
