CuAl2O4掺杂改性TiO2薄膜的制备与可见光催化性能研究

采用溶胶-凝胶方法在玻璃基片上制备了CuAl2O4掺杂改性的复合薄膜．研究了CuAl2O4的掺杂量、光照时间、薄膜厚度对TiO2复合薄膜光催化性能的影响，利用可见-紫外分光光度计测定酸性红B降解前后516nm处的吸光度，依此计算出薄膜对染料的降解率．借助于紫外可见光谱、X射线衍射、接触角测定仪等研究了薄膜的结构与性能．结果表明：随着CuAl2O4掺杂量的增加，TiO2复合薄膜对酸性红B水溶液的可见光降解脱色率增大．采用吸收光谱确定了CuAl2O4掺杂量为0％、0．5％、1％、1．5％％（摩尔分数）的TiO2复合薄膜的激发极限波长，分别是350、370、380、430nm，吸收边向可见区红移了20-80nm，可见光吸收范围明显扩大．

The synthesis and visible photocatalytic properties of CuAl2O4 doped TiO2 compound thin film

CuAl2O4 doped TiO2 nanometer compound thin film on glass substrate was prepared by the sol-gel method. The photocatalytic activity of modified TiO2 thin film was studied by changing CuAl2O4 dope amount, illumination time and thickness of plated film. The absorbance of the initial and after photodegradation of acid red B solution was measured at 516nm by using UV-vis spectrophotometer. According to the data, the photodegradation rates of acid red B solution by TiO2 compound thin film were calculated. The crystal structure and properties of the film were investigated by UV-vis spectrophotometer, XRD, the contact angle meter and so on. The results indicate that the photocatalytic rate of acid red B increased with increase of CuAl2O4 doped amount. The absorption edge wavelength of TiO2 compound thin film was determined by the absorption spectra. After doping CuAl2O4, the absorption edge wavelength red-shifted to visible light region, adsorption range was expanded obviously.