La^(3+)掺杂WO_3的制备及其光催化分解水活性的研究  

Preparation of La^(3+)-Doped WO_3 and its Photo-catalytic Activity for Water Splitting

作　　者：罗莎[1] 李洁[1] 杜俊平[1] 陈启元[1] 

机构地区：[1]中南大学化学化工学院,湖南长沙410083

出　　处：《中国钨业》2010年第3期24-26,共3页China Tungsten Industry

基　　金：国家"863"资助项目(2007A06Z129)

摘　　要：研究了不同掺杂量和焙烧温度对La3+掺杂WO3催化材料催化分解水析氧活性的影响,通过XRD检测表征了La3+掺杂WO3的相组成与掺杂量的关系。实验结果表明,400℃条件下制备的0.05%La3+/WO3催化剂的催化活性最高,与未掺杂WO3相比,其光催化析氧速率增加1.44倍。微量La3+的掺杂能够有效提高WO3的光催化活性。La3+的掺杂可以抑制WO3由单斜晶型向六方晶型的转变。WO3 photo-catalysts doped with La^3＋were prepared by solid state reaction. This paper studied the effects of the doping amount and calcine temperatures on photo-acatalystic performance of water splitting. Influence of content of La^3＋ on the component phase was characterized by XRD. In the experiments of water splitting to oxygen under the ultraviolet light irradiation for 12 h, 0.05 %（wt） La^3＋ -doped WO3 samples calcined at 400 ℃ exhibited excellent photo-catalytic activity, as the rate for oxygen evolution was up to 1.44 times of that of pure WO3. Trace quantities of La^3＋ enhance the photo-catalytic of the WO3, while with small quantities of La^3＋, the doping was detrimental. The results showed that doping of La^3＋ affected the crystal structure of WO3. The presence of La^3＋ inhibited the phase transformation of WO3 from monoclinic to hexagonal.

关 键 词：镧 三氧化钨 光催化分解水 氧气 

分 类 号：O643.36[理学—物理化学]