热处理工艺对多孔TiO2薄膜光催化性能的影响

以十八胺为模板剂,采用溶胶-凝胶法在玻璃基体上制备了多孔TiO2薄膜,研究了热处理工艺对薄膜理化性质及光催化性能的影响。随煅烧温度和煅烧时间的增加,TiO2薄膜表面逐渐形成清晰的孔结构,晶粒尺寸增大。薄膜由锐钛矿型TiO2组成,Ti以Ti 4+的形式存在。制备的TiO2薄膜厚度在200nm左右,薄膜的UV-Vis透射率随煅烧温度的升高呈下降趋势,随煅烧时间的延长先下降而后又上升。多孔TiO2薄膜光催化降解甲基橙结果表明,随煅烧温度升高薄膜的光催化活性增加,在500℃煅烧2h制备的薄膜具有最佳的光催化活性。

Influences of thermal treatment on photocatalytic property of porous TiO_2 films

Porous TiO2 films were synthesized on glass substrates by octadecylamine(ODA)-associated sol-gel method.The influences of thermal treatment on the physicochemical properties and photocatalytic activity of the films were investigated.With the increase of calcination temperature and time,the pore structures gradually appeared on the surface of the films and grain size grew up at the same time.The films were composed of anatase titanium dioxide crystals and Ti was in its Ti4+ oxidation state.The film thickness was around 200 nm.The UV-Vis transmittance of the films declined with increasing calcination temperature.Meanwhile,the transmittance declined at first with extended calcination time and then increased afterwards.Photocatalytic methyl orange degradation was enhanced on the porous TiO2 films calcinated at higher temperature.The photocatalytic activity of the film calcinated at 500℃ for 2 h represented the optimal value.