中文摘要：

采用Cu和Ce对TiO2进行改性,基于正交实验设计和BP神经网络研究了Cu-Ce/TiO2中Cu-Ce对TiO2的摩尔百分数、Cu-Ce/TiO2中CuCe摩尔比及Cu-Ce/TiO2烧结温度对Cu-Ce/TiO2光催化降解甲醛溶液性能的影响.同时,对Cu-Ce/TiO2制备方案进行了优化,并运用X射线衍射仪、扫描电子显微镜和紫外-可见分光光度计对最佳条件下制备的Cu-Ce/TiO2进行表征.结果表明,优化的制备条件为Cu-Ce/TiO2中Cu-Ce对TiO2的摩尔百分数为2.88%,Cu-Ce/TiO2中Cu-Ce的摩尔比为1∶1,Cu-Ce/TiO2的烧结温度为570℃.共掺杂Cu离子和Ce离子能有效避免掺杂TiO2晶格内部表层和近表层产生较多的位错,从而抑制晶格畸变增大;诱导TiO2中锐钛矿型晶体向金红石型晶体转变的能力增强,有效抑制电子-空穴对的复合,产生介电局域效应.

英文摘要：

TiO2 was modified by doping Cu and Ce. The effect of Cu-Ce molar percentage of TiO2,Cu-Ce molar ratio and sintering temperature on photocatalytic performance of Cu-Ce / TiO2 were studied by orthogonal design and BP neural network,then,the preparation of Cu-Ce / TiO2 was optimized.The optimal Cu-Ce / TiO2 properties were characterized by X-ray diffraction,scanning electron microscopy,and ultraviolet-visible spectroscope. The results showed that the optimized program were Cu-Ce at the molar percentage of 2. 88% in TiO2,with Cu-Ce at a molar ratio of 1∶ 1 and sintering temperature of 570 ℃. Co-doping Cu and Ce ions can effectively avoid generating more dislocation out of doped TiO2 lattice on its crystal surface and near surface so as to suppress the lattice distortion; thus enhance the ability of the transformation from TiO2 anatase to rutile crystal,and effectively inhibit the recombination of electron hole pairs,resulting in the dielectric confinement effect.