Enhanced photo-catalytic activity of gold ion and gold modified
The gold ion modified TiO2 was prepared by means of sol- gelwhereas gold deposited TiO2 was prepared by means of photo- reduction. The physical properties were influenced significantly by the presence of gold ion or gold. The enhanced photo-activity of gold modified TiO2 was quantified in terms of methylene blue degradation. The presence of gold ion in TiO2 lattices or gold on TiO2 surface enhanced their photo-activity. The optimum molar content of gold ion doping and gold deposition all was 0.5%. The first-order rates constants of gold modified TiO2 was more than that of pure TiO2, and decreased by increasing the content of gold ion and gold when their contents were more than 0.5%. Gold iondoped in TiO2 lattices was more effective to enhance the photo-activity than gold on TiO2 surface. Moreover, the relationship between physical properties, chemical properties and photo-activityhas been discussed.
作 者： GU Guo-bang HUANG Guo-feng LI Xin-jun WAN Hong-fu LI Fang-bai 作者单位： GU Guo-bang,LI Xin-jun(College of Chemical Engineering, South China University of Technology,)HUANG Guo-feng,WAN Hong-fu,LI Fang-bai(Guangdong Institute of Eco-Environment and Soil Science,)
刊 名： 环境科学学报(英文版) ISTIC SCI 英文刊名： ENVIRONMENTAL SCIENCES 年，卷(期)： 2001 13(2) 分类号： X13 关键词：