掺Ag, Ni对TiO2气相光催化活性的影响

采用溶胶-凝胶法制备了以活性炭为载体的负载型Ag/TiO2及Ni/TiO2光催化剂，以气相中甲苯降解反应考察了两种催化剂的活性随金属离子掺杂量的变化. 用透射电镜、X射线衍射及荧光光谱对掺杂催化剂进行了表征. 结果表明，经Ag, Ni掺杂后，Ag/TiO2和Ni/TiO2两种催化剂的催化活性均有不同程度的提高，且Ni/TiO2优于Ag/TiO2. 两种催化剂的最佳掺杂量均为0.4%. 根据表征及实验结果分析了金属离子不同掺杂量影响TiO2光催化活性的机理.

Gas-phase Photocatalytic Activity of TiO2 Doped with Ag and Ni

The Ag/TiO2 and Ni/TiO2 photocatalysts with variable Ag and Ni loadings were prepared by the sol-gel method, and their photocatalytic activities were tested by using gas-phase toluene degradation as the modal reaction. Two doped photocatalysts were characterized by means of transmission electron microscopy (TEM), X-ray diffraction (XRD) and fluorescence spectra (FS). The results showed that a suitable metal ion loading could greatly enhance the TiO2 photocatalytic activity, and Ni/TiO2 was superior to Ag/TiO2. The optimal doping amount of two photocatalysts was 0.4%. At the same time, the effect of doped metal ion loadings on the photocatalytic activity was discussed.