多孔金属氧化物半导体薄膜的制备及光催化性能

Preparation and Photocatalytic Activity of Porous Metal Oxides Films

以垂直蒸发沉积法制备的聚苯乙烯(PS)胶态晶体为模板,采用溶胶–凝胶法制备多孔ZnO和TiO_2薄膜,分别考察其对罗丹明B(Rh B)溶液的光催化降解效果。使用扫描电子显微镜观察PS胶态晶体以及多孔ZnO和TiO_2薄膜的形貌,以紫外–可见吸收光谱仪表征光催化降解效果。结果表明:PS微球分散液浓度为0.025%时,胶态晶体为单层和多层结构,随着浓度增加至0.100%,胶态晶体呈现完善的多层结构;PS微球分散液浓度为0.100%、ZnO溶胶浓度为0.3 mol/L制备的多孔ZnO薄膜对Rh B降解效果较好;PS微球分散液浓度为0.025%、TiO_2溶胶浓度为0.1 mol/L获得的多孔TiO_2薄膜对Rh B降解效果较好。多孔ZnO薄膜对Rh B的降解效果优于多孔TiO_2薄膜。

Porous ZnO and TiO2 films were fabricated by a sol-gel method with polystyrene colloidal crystal as a template, which was prepared via a vertical deposition method. The effect of porous ZnO and TiO2 films on the photocatalysis degradation to Rhodamine B solution was investigated. The structure of polystyrene colloidal crystal templates, porous ZnO and TiO2 films was analyzed by scanning electron microscopy. The photocatalysis degradation ability of porous ZnO and TiO2 films was evaluated by ultraviolet-visible spectrometry. The results show that the colloidal crystal prepared by 0.025% polystyrene suspension presents both monolayer and multilayer structure, and as the concentration increases to 0.100%, the colloidal crystal shows perfect multilayer structure. The porous ZnO films obtained from 0.3 mol/L sol and 0.100% polystyrene suspension show better photocatalytic degradation ability. Meanwhile, for the porous TiO2 films, the optimal photocatalytic degradation ability is obtained with 0.1 mol/L sol and 0.025% polystyrene suspension.Whereas, the photocatalytic degradation ability of porous ZnO films is superior to TiO2 films.