基于BP神经网络优化制备Cu-Ce/TiO_2及其光催化活性研究  

Optimizing preparation and photocatalytic activity of Cu-Ce/TiO_2 based on BP neural network

作　　者：张浩[1] 许谨 曹现雷[1] 

机构地区：[1]安徽工业大学建筑工程学院,马鞍山243032 [2]中国十七冶集团有限公司,马鞍山243000

出　　处：《环境科学学报》2015年第8期2450-2456,共7页Acta Scientiae Circumstantiae

基　　金：国家自然科学基金(No.51208002)~~

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.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.

关 键 词：Cu-Ce/Ti O2 甲醛水溶液 正交设计 BP神经网络 优化 

分 类 号：X703[环境科学与工程—环境工程]