核壳异质结催化剂BiOCl/F-TiO2可见光催化降解4-氯酚

利用光催化技术降解4-氯酚,是缓解含氯酚类水污染的有效方法之一。采用两步水热法制备了F掺杂的TiO2纳米片F-TiO2复合BiOCl微球的核壳异质结催化剂BiOCl/F-TiO2。当BiOCl∶F-TiO2为1.0∶5.0(摩尔比)时,催化剂表现出最高的光催化活性。基于X射线衍射(XRD)、扫描电子显微镜(SEM)、X射线光电子能谱(XPS)、透射电子显微镜(TEM)、紫外-可见(UV-Vis)吸收光谱、Mott-Schottky曲线和电流-时间曲线等表征结果,可以推断BiOCl和F-TiO2之间形成的p-n异质结能有效分离光生电子和空穴,是催化剂高效活性的主要原因。

Photocatalytic degradation of p-chlorophenol by core-shell heterojunction catalyst BiOCl/F-TiO2 under visible light

Photocatalytic degradation of p-chlorophenol with solar energy have been the potential solutions to chlorophenol-containing water.A two-step hydrothermal process was proposed to synthesize fluorinated TiO2(F-TiO2)and BiOCl core-shell heterojunction photocatalyst BiOCl/F-TiO2.The samples were characterized by X-ray diffraction(XRD),scanning electron microscope(SEM),X-ray photoelectron spectroscopy(XPS),transmission electron microscope(TEM),ultraviolet-visible(UV-Vis)absorption spectra,Mott-Schottky plot and current-time curve.With the mole ratio of BiOCl∶F-TiO2 being 1.0∶5.0,the catalyst showed the best catalytic performance for degradation of p-chlorophenol.The pronounced photocatalytic performance should be attributed to the efficient separation of the light electrons and holes arisen from the p-n junction between BiOCl and F-TiO2.