掺杂不同pH值Bi2 WO6对ZrO2-TiO2光催化降解苯的影响

Influence of Bi_2WO_6 with different pH on photo catalytic degradation benzene over TiO_2-ZrO_2

将不同pH值下制备的Bi2WO6掺杂到共沉淀法制备的ZrO2-TiO2中合成一系列Bi2WO6-ZrO2-TiO2复合催化剂用于光催化降解苯。采用了X射线衍射(XRD),N2吸脱附,紫外-可见(UV-Vis)漫反射光谱,傅里叶红外变换光谱(FT-IR)和X光电子能谱(XPS)等手段对催化剂进行了表征。结果表明随着pH值的增大,催化剂晶粒尺寸减小,比表面积增大。Bi2WO6的掺杂降低了催化剂的禁带宽度,使催化剂感光范围拓展到可见光区。通过对气相苯的降解实验发现,掺杂pH=7的Bi2WO6的复合氧化物催化剂的紫外和可见光催化活性最高。

A series of Bi2 WO6 with different pH values doped in ZrO2-TiO2 were prepared by the co-precipitation method to synthe-size Bi2 WO6-ZrO2-TiO2 mixed oxide and was used for photo-catalytic benzene. The catalysts were characterized by XRD,N2 adsorp-tion-desorption,UV-Vis diffuse reflectance spectroscopy,FT-IR and XPS. The results showed that the crystal size of catalyst became smaller and the surface area became larger with increasing pH values of Bi2 WO6 . Doping of Bi2 WO6 decreased the band gap of cata-lysts,which contributed to expand the sensitization range of catalysts to the visible light. The best ultraviolet light and visible light activities were obtained over the mixed oxides catalyst doped Bi2 WO6 at pH=7 in the experiment of catalytic gaseous benzene.