Abstract: TiO2 was modified with transition metal Cu and rare earth metal Ce. The effects of Cu-Ce-doped loading, molar ratio of Cu to Ce and sintering temperature on photocatalytic performance of Cu-Ce/TiO2 were studied by response surface method, the quadratic polynomial prediction model on the three factors was also developed, the preparation program for Cu-Ce/TiO2 was optimized, and the optimal Cu-Ce/TiO2 property was characterized. The results show that the three factors affect the photocatalytic performance of Cu-Ce/TiO2, but the effect of sintering temperature is obviously more significant than that of Cu-Ce-doped loading, and the effect of Cu-Ce-doped loading more significant than that of molar ratio of Cu to Ce. The optimization program was Cu-Ce-doped loading 2.88%(mol), molar ratio of Cu to Ce 1.6364 and sintering temperature 544℃. Cu-Ce doping could effectively avoid dislocation of doped TiO2 crystal surface and near surface, generate more to suppress the lattice distortion increased, enhance the ability to induce TiO2 anatase crystal transformation to rutile crystal, and improve the uniformity and dispersion performance of particle size.

Key words: Cu-Ce/TiO2, response surface method, numerical simulation, optimization, formaldehyde, photocatalytic degradation

摘要： 采用溶胶-凝胶法，以过渡金属Cu离子和稀土金属Ce离子改性TiO2制备Cu-Ce/TiO2，基于响应面和数值模拟方法研究Cu-Ce负载量(Cu-Ce含量)、Cu/Ce摩尔比及烧结温度对Cu-Ce/TiO2光催化降解甲醛溶液性能的影响，对Cu-Ce/TiO2制备方案进行优化，并对最佳条件下制备的Cu-Ce/TiO2进行表征. 结果表明，三个因素均对Cu-Ce/TiO2的光催化性能有影响，其影响显著性为：烧结温度>Cu-Ce负载量>Cu/Ce摩尔比. 优化的制备条件为：Cu-Ce负载量2.88%(mol), Cu/Ce摩尔比1.6364，烧结温度544℃. Cu-Ce共同改性TiO2能有效避免掺杂TiO2晶格内部表层和近表层产生较多的位错，抑制晶格畸变增大，诱导TiO2中锐钛矿型晶体向金红石型晶体转变的能力增强，提高粒径均匀性和分散性能.

关键词: Cu-Ce/TiO2, 响应面法, 数值模拟, 优化, 甲醛, 光催化降解