氧缺陷Bi_2WO_(6-x)可见光催化剂的制备和性能  

Preparation and Property of Oxygen-deficient Bi_2WO_(6-x) Photocatalyst Active in Visible Light

作　　者：卢青[1] 华罗光 陈亦琳[1] 高碧芬[1] 林碧洲[1] 

机构地区：[1]华侨大学材料科学与工程学院,厦门361021

出　　处：《无机材料学报》2015年第4期413-419,共7页Journal of Inorganic Materials

基　　金：国家自然科学基金(21003055;21103054);福建省自然科学基金(2012J01043);华侨大学中青年教师科研提升资助计划(ZQN-PY205)~~

摘　　要：采用乙二醇溶剂热法原位制备氧缺陷Bi2WO6-x催化剂,利用XRD、SEM、N2吸附–脱附、XPS、ESR、UV-Vis DRS、PL及电化学方法对样品的理化性能进行了表征,考察了样品在可见光下(λ>400 nm)对气相苯的光催化降解性能。结果表明:乙二醇溶剂热法制备的催化剂具有较大比表面积,形成了Bi-Ov和W-Ov氧缺陷中心;缺陷的生成改变了催化剂的能带结构,缩小其光响应带隙宽度,并有效抑制了光生电子–空穴对的复合,催化剂的活性增强。Bi2WO6-x降解苯的转化率和矿化率分别为52.5%和80.6%,是Bi2WO6的1.72倍和1.84倍。Oxygen-deficient Bi2WO6-x catalyst was prepared in situ by a solvothermal method using ethylene glycol as the solvent. The physicochemical properties of the as-prepared catalyst were characterized by XRD, SEM, N2 isothermal, XPS, ESR, UV-Vis DRS, PL and electrochemical analyses. The photocatalytic activity of catalysts was evaluated by the degradation of gaseous benzene under visible-light irradiation（λ 400 nm）. The results indicate that the oxygen-deficient Bi2WO6-x with a larger specific surface area possesses Bi-Ov and W-Ov oxygen vacancies. The formation of oxygen defects narrows optical bandgap of Bi2WO6 and hinders photoinduced electron-hole pairs from recombination, which enhances the photocatalytic activity. The conversion and mineralization rates of benzene on the as-prepared Bi2WO6-x are increased up to 52.5% and 80.6%, respectively, which are correspondingly 1.72 and 1.84 times as high as those on the pristine Bi2WO6.

关 键 词：Bi2WO6 溶剂热法 氧缺陷 可见光 

分 类 号：O643[理学—物理化学]