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 iso-thermal, XPS, ESR, UV-Vis DRS, PL and electrochemical analyses. The photocatalytic activity of catalysts was evalu-ated 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 for-mation of oxygen defects narrows optical bandgap of Bi2WO6 and hinders photoinduced electron-hole pairs from re-combination, 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.
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