微乳液制备负载型共掺杂TiO2光催化剂及性能研究  

Preparation and Performance of Co-doped TiO_2 on Load Photocatalyst Made by Micro-emulsion

作　　者：薛茹君[1,2] 吴玉程[1] 

机构地区：[1]安徽理工大学化学工程系,安徽淮南232001 [2]合肥工业大学材料科学与工程学院,安徽合肥230009

出　　处：《中国矿业大学学报》2009年第1期140-143,共4页Journal of China University of Mining & Technology

基　　金：高等学校博士学科点专项科研基金项目(20060359011);合肥工业大学中青年创新群体基金项目(103-037016)

摘　　要：采用反相微乳液法制取了La3+,Fe3+共掺杂TiO2/活性白土光催化剂,用UV-Vis光谱对其紫外可见光区吸收性能进行了表征.考察了La3+,Fe3+共掺杂对TiO2/活性白土可见光催化性能的影响以及溶液pH值等对甲基橙脱色率的影响.实验结果表明,La3+,Fe3+共掺杂有协同作用,其吸收边带红移比La3+或Fe3+单元掺杂的更多,对可见光的吸收也比单元掺杂更强;太阳光照射下1.0%La3+-0.3%Fe3+-TiO2/活性白土对甲基橙脱色率达到48%,大于单一La3+或Fe3+掺杂样品的脱色率(45%和30%);甲基橙溶液pH=4时,其脱色率最大;日光照射反应时间超过6 h后,甲基橙脱色率升高幅度变得缓慢.La^3＋ , Fe^3＋ co-doped TiO2/activated clay （AC） photocatalyst was prepared by a W/O micro-emulsion. The absorption for ultraviolet and visible light of the catalyst was characterized by an UV-Vis DRS. The effect of La^3＋ , Fe^3＋ co-doping on the visible photocatalytic activity of the catalyst and that of pH value of the solution on the decolorizing efficiency （De） for methyl orange were investigated. The results show that the co-doped Fe^3＋ and La^3＋ had a synergism, which make the photocatalyst produce a bigger red shift and a stronger absorption for visible light than by Fe^3＋ or La^3＋ mono-doped catalyst. The decolor percent of 1.0% La^3＋- 0.3%Fe^3＋-TiO2/AC for methyl orange solution under sunlight illumination can reach 48%, which is bigger than that of Fe^3＋ or La^3＋ doped catalysts （30% and 45% respectively）. The decolor percent of the catalyst is largest when the pH value of methyl orange solution is 4, and increases slowly after the reaction time is longer than 6 h under daylight irradiation.

关 键 词：TIO2光催化剂 共掺杂 负载型 微乳液 

分 类 号：O614[理学—无机化学]