摘要
在不同组成O2/Ar混合气体条件下,于700℃将仲钨酸铵加热分解制备WO3催化剂。采用XRD、XPS、DRS等技术对催化剂进行表征,考察催化剂在电子接受体Fe3+溶液体系下的光催化分解水析氧活性。结果表明:Ar含量增大,WO3催化剂表面氧空位增加,光催化析氧活性增大,纯Ar条件下所得的WO3催化剂光催化析氧活性最高。研究了Fe2+对光催化分解水析氧活性的影响,在Fe3+离子作为电子接受体的光催化分解水析氧反应中,一定浓度的Fe2+离子能明显抑制WO3的析氧活性,当Fe2+离子和Fe3+离子的浓度相当时,WO3催化剂完全失去光催化析氧活性。
A series of WO3 catalysts were obtained through pyrolysis of ammonium paratungstate under different O2/Ar at 700 ℃. The catalysts were identified by XRD, XPS, DRS measurements, and the photocatalytic activity of WO3 for O2 evolution was studied. The results indicate that with the increasing content of Ar, the oxygen vacancies of WO3 catalysts are increased, the photocatalytic activity for O2 evolution is advanced and the photocatalytic activity of WO3 obtained in pure Ar is the highest. The influence of Fe^2＋ on photocatalytic activity for O2 evolution was also investigated. The results show that the activity of WO3 is restrained by Fe^2＋ in the photocatalytic reaction with Fe^3＋ as electron acceptor.
出处
《中国有色金属学报》
EI
CAS
CSCD
北大核心
2006年第5期904-908,共5页
The Chinese Journal of Nonferrous Metals
基金
国家高技术研究发展计划资助项目(2002AA327140)
