摘要
研究了用胶体Ag纳米粒子负载法合成的Ag/TiO2光催化剂对可见光催化降解目标污染物亚甲基蓝和苯酚的催化活性。根据Ag/TiO2催化剂样品的UV-Vis吸收光谱和XPS表征的Ag粒子结合能,探讨了可见光激发Ag/TiO2的催化机理。同时,实验了催化剂在太阳光照射下对城市污水水样的催化净化作用。结果表明,以8 nm银胶粒子负载形成的0.5%Ag/TiO2光催化剂具有较高的可见光光催化活性;当用这一催化剂催化净化城市污水水样时,催化后水质依照COD值进行评价能够达到国家城市污水处理厂排放一级A标准。
The photocatalytic activity of Ag/TiO2 catalyst prepared by colloid impregnating method was studied for the degradation of methylene blue and phenol as the target pollutants with visible light irradiation.Based on UV-Vis absorption spectrum and chemical binding energy of Ag/TiO2 catalyst samples,the mechanism of visible light photoexcited process was discussed.The catalytic purification of urban sewage sample by using Ag/TiO2 catalyst was also tested under sunlight irradiation.The results show that 0.5% Ag/TiO2 catalyst prepared by impregnating 8 nm colloidal Ag nanoparticles on TiO2 has good photocatalytic activity under visible light irradiation,and when this catalyst was used to purify urban sewage sample,the water quality resulted could reach to release level A standard set for urban sewage disposal plants according to COD value.
出处
《贵金属》
CAS
CSCD
北大核心
2010年第4期1-6,共6页
Precious Metals
基金
云南省自然科学基金重点项目(2004E0003Z)
云南省贵金属材料重点实验室资助
关键词
物理化学
Ag/TiO2光催化剂
可见光
亚甲基蓝
苯酚
城市污水
光催化降解
physical chemistry
Ag/TiO2 photocatalyt
visible light irradiation
methylene blue
phenol
photocatalytic degradation
urban sewage
