采用水热法在γ-Bi₂MoO₆光催化剂表面修饰了纳米级Cu₂O, 得到了具有高效可见光响应的复合光催化材料,并利用X射线粉末衍射(XRD)、扫描电子显微镜(SEM)、透射电子显微镜(TEM)、选区电子衍射(SAED)、X射线光电子能谱(XPS)和紫外-可见漫反射光谱(UV-Vis-DRS)等技术对其相结构、微观形貌和光吸收性能进行了表征.在可见光条件下(λ>400 nm)考察了Cu₂O表面修饰对γ-Bi₂MoO₆光催化降解亚甲基蓝(MB)性能的促进作用.结果表明,纳米级Cu₂O(～10 nm)颗粒均匀地修饰于γ-Bi₂MoO₆的表面,使γ-Bi₂MoO₆的可见光吸收带发生明显红移,且吸收强度大幅提高,增强了复合材料光生电子-空穴对的分离效率, 从而使复合材料表现出较高的光催化活性.当Cu₂O的表面修饰量为1.5%(w)时,复合光催化剂降解MB的活性与纯γ-Bi₂MoO₆相比提高了6.4倍.

Nanosized cuprous oxide (Cu₂O) was used to modify the surface of gamma-Bi2MoO6, resulting in highly efficient visible-light-responsive Cu₂O/γ-Bi₂MoO₆ composite photocatalysts. The obtained photocatalysts were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), selected area electron diffraction (SAED), X-ray photoelectron spectroscopy (XPS), and UV-Vis diffuse reflectance spectrum (UV-Vis-DRS) to determine their phase structures, micromorphologies, and light absorption properties. The important role of surface-modified Cu₂O in improving the photocatalytic activity of γ-Bi₂MoO₆ under visible light irradiation was studied using the degradation of methylene blue (MB). The results showed that Cu₂O nanoparticles with average size of similar to 10 nm modified the surface of the γ-Bi₂MoO₆. The nanoparticles delivered both an obvious red-shift of absorption threshold and intensity of the γ-Bi₂MoO₆, as well as enhanced separation efficiency of photogenerated carriers, thereby leading to significant enhancement in photocatalytic activity. When the amount of Cu₂O was 1.5%, the photocatalytic activity of the Cu₂O/γ-Bi₂MoO₆ composite photocatalyst was 6.4 times higher than that of pristine γ-Bi₂MoO₆.