摘要
在可见光或紫外光照的非循环体系中 ,进行了氧化钛基的催化剂光催化降解乙烯的研究 .考察了不同的乙烯初始浓度、不同温度、不同光源和负载贵金属对光降解效率的影响 .结果表明 ,乙烯浓度在 38～ 1 88mg/m3 范围时 ,光降解效率随乙烯初始浓度升高而缓慢地线性下降 ;温度升高有利于光降解 ;负载的贵金属不仅抑制电子空穴对复合 ,而且扩大了氧化钛对可见光的吸收 。
The photocatalytic degradation of ethylene over titania-based photocatalysts was studied under a non-circulating system using visible or near-UV light. The roles of the reaction temperature and the inlet concentration of ethylene and the influence of different light source were investigated. Then the efficiency of noble metals-doped photocatalyst was compared with that of the bare one. The experiment results indicated that when the inlet concentration was in range of 38～188 mg/m 3 the photo-degradation efficiency of the bare photocatalyst dropped linearly and very slowly with the increase of inlet concentration of ethylene; the degradation efficiency increased as raising the reaction temperature;noble metals not only decreased the recombination of electron-hole pairs, but also increased the absorption for visible light, leading to the photocatalytic efficiency in several-tens times higher in visible light.
出处
《环境科学》
EI
CAS
CSCD
北大核心
2004年第4期105-108,共4页
Environmental Science
基金
国家高技术研究发展计划 ( 863计划 )项目( 2 0 0 2AA64 90 40 )
国家自然科学基金项目 ( 2 0 3 770 5 0
2 0 0 70 0 4)
关键词
钛基催化剂
贵金属
光催化
空气净化
titania-based photocatalysts
noble metals
photocatalytic degradation
air purification
