陶粒负载纳米TiO_2催化臭氧化降解水中微量硝基苯  

Degradation of Trace Nitrobenzene in Aqueous Solution by Ozone with Catalysis of Nanosized TiO_2 Supported on Haydite

作　　者：张静[1] 马军[1] 杨忆新[1] 王胜军[1] 秦庆东[1] 

机构地区：[1]哈尔滨工业大学市政环境工程学院,哈尔滨150090

出　　处：《环境科学》2007年第10期2208-2212,共5页Environmental Science

基　　金：国家自然科学基金项目(50378028)

摘　　要：制备了以陶粒为载体的纳米二氧化钛催化剂,并以硝基苯为稳定性有机污染物的目标降解物,研究了其对臭氧化的催化性能,对影响催化效果因素及降解机理进行了探讨.实验对不同温度条件下烧结的催化剂催化臭氧化有机物能力进行了比较,使用SEM进行表征,确定最佳烧结温度.通过改变催化剂投量、硝基苯初始浓度、pH值、添加不同浓度自由基抑制剂和催化剂重复使用实验等,表明在700℃温度下烧结的催化剂具有最大催化活性;硝基苯臭氧化反应中主要氧化剂为羟基自由基,其降解反应为一级反应;硝基苯的去除率随催化剂投量增加而增大;在pH为10时催化剂具有最好的催化效果,对硝基苯的去除率为46.5%;催化剂连续3次重复使用性能良好.This paper presented the results of catalytic degradation of nitrobenzene by ozone in the presence of nanosized TiO2 supported on haydite, and evaluated influencing factors and the pathway of degradation. Catalysts were prepared by sol-sel method, and sintered in electrical resistance furnace. The optimum sinter temperature was found for preparing the catalyst. The SEM was also used to characterize the catalyst. When the catalyst was sintered at 700℃, it had the best property of catalysis. The catalytic ozonation of nitrobenzene was first order reaction with respect to the concentration of nitrobenzene, and OH was the dominating species in the oxidation process. As the dose of catalyst increased, the removing rate of nitrobenzene also increased. The highest ozonation rate of this compound, which is 46.5%, was found when pH value was approximately 10. Besides, the catalyst showed good ability after 3 times repeated uses.

关 键 词：纳米二氧化钛 臭氧催化氧化 陶粒 硝基苯 

分 类 号：X703.1[环境科学与工程—环境工程] TU991.2[建筑科学—市政工程]