Enhanced photo-catalytic activity of gold ion and gold modified  

作　　者：LI Fang-bai GU Guo-bang HUANG Guo-feng LI Xin-jun WAN Hong-fu 

机构地区：[1]Guangdong Institute of Eco-Environment and Soil Science,Guangzhou 510650,China [2]College of Chemical Engineering,South China University of Technology,Guangdong 510642,China

出　　处：《Journal of Environmental Sciences》2001年第2期201-204,共4页环境科学学报（英文版）

基　　金：Guangdong Natural Science Foundation (No .980 0 12 )

摘　　要：The gold ion modified TiO2 was prepared by means of sol-gel whereas gold deposited TiO2 was prepared by means of photoreduction. The physical properties were influenced significantly by the presence of gold ion or gold. The enhanced photo-activity of gold modified TiO2 vas 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 ion doped 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-activity has been discussed.The gold ion modified TiO2 was prepared by means of sol-gel whereas gold deposited TiO2 was prepared by means of photoreduction. The physical properties were influenced significantly by the presence of gold ion or gold. The enhanced photo-activity of gold modified TiO2 vas 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 ion doped 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-activity has been discussed.

关 键 词：gold modification titanium dioxide PHOTO-CATALYSIS methylene blue 

分 类 号：X13[环境科学与工程—环境科学]