Preparation and Photocatalytic Performance of One-Dimensional CdS/TiO_2

By using hydrogen titanate nanotubes as support and titanium sol composed of CdCl2 and thiourea as modifying precursor,one-dimensional CdS/TiO2 catalysts with different CdS contents were prepared after calcination.The prepared materials were characterized by X-ray diffraction,transmission electron microscopy,N2 adsorption,UV-Vis diffuse reflectance spectroscopy,and X-ray photoelectron spectroscopy.Using methyl orange solution as wastewater,the photocatalytic activity of CdS/TiO2 was investigated under UV light and simulated sunlight irradiation.The results indicate that the tubular structure of titanate nanotubes is damaged and one-dimensional TiO2 crystals form after the calcination process at high temperature.After TiO2 is modified by CdS,improved photocatalytic performance is obtained,and 3% CdS/TiO2 calcined at 400 oC exhibits the best catalytic performance.