一锅法合成缺陷型Bi/BiOBr纳米复合材料及其可见光驱动去除水体六价铬离子和有机染料的研究  

Facile One-pot Synthesis of Bi-decorated Defective BiOBr Composites with Remarkable Visible Light Driven Activity Towards Reduction of Aqueous Cr(Ⅵ)and Degradation of Organic Dye

作　　者：贾雯 袁小亚[1,2] 冯紫娟 吴雪 彭冬 刘毅 JIA Wen;YUAN Xiaoya;FENG Zijuan;WU Xue;PENG Dong;LIU Yi(China-Spain Collaborative Research Center for Advanced Materials,Chongqing Jiaotong University,Chongqing 400074,China;College of Materials Science and Engineering,Chongqing Jiaotong University,Chongqing 400074,China)

机构地区：[1]重庆交通大学中国-西班牙先进材料合作研究中心,重庆400074 [2]重庆交通大学材料科学与工程学院,重庆400074

出　　处：《材料导报》2021年第24期24032-24040,共9页Materials Reports

基　　金：supported by the National Natural Science Foundation of China(51402030).

摘　　要：通过调节铋的前驱体与溴化物盐的相对物质的量比,采用简便的一锅溶剂热法制备了具有可调的铋含量和氧空位的Bi/BiOBr纳米复合材料。详细的表征表明,BiOBr表面上的Bi纳米粒子和{110}面上的氧空位是在此过程中同时制造的,以乙二醇(EG)用作溶剂,可将Bi^(3+)还原为金属Bi,并同时形成氧空位。光催化性能表明,Bi/BiOBr纳米复合材料在降解Cr(Ⅵ)和亚甲基蓝(MB)方面表现出优于同类材料的光催化活性,Bi/BiOBr的去除效率高度依赖于Bi的含量和氧空位。在所有制备的样品中,Bi含量为5.0%的样品在4 h可见光照射下表现出最高的光催化活性,其中Cr(Ⅵ)和MB的去除率分别达到97.3%和90.5%。机理研究表明,Bi/BiOBr纳米复合材料具有明显的可见光驱动光活性,归功于氧空位和金属Bi的表面等离子共振(SPR)效应,有助于增强可见光的收集和光生电子-空穴对的分离效率。本工作为Bi含量可控且伴随氧空位形成的异质结构材料的设计提供了一种新方法。Bi/BiOBr nanocomposites with tunable Bi content and oxygen vacancies were prepared via a facile one-pot solvothermal method by adjusting the relative molar ratio of Bi precursor and bromide salt.Detailed characterizations showed that Bi nanoparticles and oxygen-vacancies on the{110}-plane of BiOBr were fabricated simultaneously in this process and ethylene glycol(EG)used as solvent afforded reduction of Bi 3+to metallic Bi and coinstantaneous conformation of oxygen vacancy.The photocatalytic performance showed that the Bi/BiOBr nanocomposites exhibited superior photocatalytic activity to their counterparts in degrading aqueous Cr(Ⅵ)and methylene blue(MB),and the removal efficiency of Bi/BiOBr was highly dependent on the content of Bi and oxygen vacancy.Among all as-prepared samples,the sample with a Bi loading of 5.0%exhibited the highest photocatalytic activity with Cr(Ⅵ)and MB removal rates up to 97.3%and 90.5%within 4 h’s visible light irradiation,respectively.The mechanism study demonstrated that the remarkable visible light driven photo-activity of Bi/BiOBr nanocomposites were described to the synergy of the surface plasmon resonance(SPR)effect of metallic Bi and oxygen vacancies,which contributed to enhance the visible light harvesting and the separation efficiency of photo-generated electron-hole pairs.The present work provided a new method to the design of heterostructure materials with controllable Bi content and concomitant formation of oxygen vacancies.

关 键 词：Bi/BiOBr 氧缺陷 表面等离子共振 光催化 可见光 

分 类 号：X703[环境科学与工程—环境工程]