Bi_2O_3/Bi_2WO_6异质结光催化剂的制备及其活性  

Preparation and Photocatalytic Activity of Bi_2O_3/Bi_2WO_6 Heterojunction Photocatalysts

作　　者：陈曦 王永强[1] 刘敏敏 韩丰磊 王敏[2] CHEN Xi;WANG Yongqiang;LIU Minmin;HAN Fenglei;WANG Min(College of Chemical Engineering,China University of Petroleum,Qingdao 266580,China;Qingdao Liquefied Natural Gas Co. Ltd.,SINOPEC,Qingdao 266400,China)

机构地区：[1]中国石油大学(华东)化学工程学院,山东青岛266580 [2]中国石化青岛液化天然气有限责任公司,山东青岛266400

出　　处：《石油学报（石油加工）》2019年第1期59-65,共7页Acta Petrolei Sinica(Petroleum Processing Section)

基　　金：国家自然科学基金项目(51202294);中央高校基本科研业务费专项资金(18CX02123A)资助

摘　　要：采用一步水热法,制备了具有高效光催化活性的Bi_2O_3/Bi_2WO_6异质结催化剂。利用X射线衍射(XRD)、扫描电子显微镜(SEM)、透射电子显微镜(TEM)、X射线光电子能谱(XPS)和N_2物理吸附(BET)等技术对催化剂样品进行表征,分析了不同Bi_2O_3负载量Bi_2O_3/Bi_2WO_6催化剂样品的催化活性并进行了光催化机理探究。结果表明:Bi_2O_3/Bi_2WO_6具有典型的异质结构,Bi_2O_3负载于Bi_2WO_6片层结构的表面,两者紧密结合并且没有破坏彼此的物相结构;相比于单体Bi_2WO_6,Bi_2O_3/Bi_2WO_6能有效促进光生电子和空穴的分离,其禁带宽度仅为2.47eV,具有良好的可见光吸收性能。模拟太阳光活性考察,2h内Bi_2O_3摩尔分数10%的Bi_2O_3/Bi_2WO_6对10mg/L罗丹明B溶液光降解效率可高达91.1%。A series of Bi2O3 containing Bi2WO6 catalysts were prepared by one-step hydrothermal synthesis method.The catalytic activity of different Bi2O3 loaded samples and the photocatalytic mechanism were analyzed by XRD,SEM,TEM,XPS and BET techniques.Results show that Bi2O3/Bi2WO6 is of typical heterostructure.Bi2O3 locates on the surface of the Bi2WO6 sheet structure,and these two phases are in close contact without breaking the phase structure of each other.Compared with the monomer Bi2WO6,Bi2O3/Bi2WO6 shows promising performance in the separation of photogenerated electrons and holes,with the band gap of only 2.47 eV,which has good absorption properties of visible light.Under visible-light irradiation,the photodegradation rate of RhB(10 mg/L) is 91.1% on Bi2O3/Bi2WO6 with 10% molar fraction of Bi2O3 for 2 h.

关 键 词：光催化 异质结 钨酸铋 氧化铋 

分 类 号：O614[理学—无机化学]