摘要
采用溶胶-凝胶法制备了二氧化硅负载H3PW12O40催化剂,并采用红外光谱、XRD及BET对其进行了表征。研究了其对水中苯酚的光催化降解性。讨论了负载催化剂用量、光照时间对苯酚和TOC去除率的影响。结果表明:PW12/SiO2负载型催化剂用量为3g/L,光照6h,10mg/L苯酚水溶液中苯酚去除率为93.06%,TOC去除率为73.20%。PW12/SiO2多相光催化10mg/L苯酚水溶液降解反应和苯酚水溶液直接光解反应均为一级动力学反应。
PW12/SiO2 is prepared with polyoxometalate （H3PW12O40 ） with Keggin structure, which is immobilized into a silica matrix by means of sol-gel technique, is used as a sort of catalyst in photocatalytic degradation of phenol in water, which is then characterized by infra-red spectrum, XRD and BET. This paper describes a bench scale study in this way and the result shows that 10mg/L of phenol in water is removed by 93.06% under the photocatalysis condition： 3g/L of PW12/SiO2 in solution, 6 hours of illumination. It is also concluded that the reactions of phenol photocatalytic degradation either with or without PW12/SiO2 follow the first--order kinetics.
出处
《环境科学与技术》
CAS
CSCD
北大核心
2010年第3期59-63,共5页
Environmental Science & Technology
基金
大连理工大学国家重点实验室开放课题项目资助(KF0707)
关键词
光催化
磷钨酸
二氧化硅
溶胶-凝胶法
苯酚
photocatalysis
phosphotungstic acid
silicon dioxide
sol-gel method
phenol
