文献类型：期刊文献

中文题名：负载型TiO_2/玻璃弹簧的光催化杀菌作用

英文题名：Photocatalytic Disinfection by TiO_2 Immobilized on Glass Springs

作者：曾炽涛[1];陈爱平[1];陈爱华[1];刘伟[1];戴智铭[1]

机构：[1]华东理工大学超细材料制备与应用教育部重点实验室,上海200237

年份：2003

卷号：24

期号：7

起止页码：520

中文期刊名：催化学报

收录：CSTPCD;;Scopus;北大核心:【北大核心2000】；CSCD:【CSCD2011_2012】；

语种：中文

中文关键词：二氧化钛;玻璃弹簧;负载型催化剂;光催化;杀菌;大肠杆菌

外文关键词：titania, glass spring, immobilized catalyst, photocatalysis, disinfection, E. coli

摘要：研究了自主开发的负载型TiO2 /玻璃弹簧光催化剂对大肠杆菌的光催化杀菌作用 .结果表明 ,光催化杀菌效果明显好于单独紫外光的杀菌效果 .光催化杀菌过程存在一个诱导期 .用扫描电镜和透射电镜观察经不同时间杀菌处理的菌液 ,结果显示光催化作用于细菌的细胞壁和细胞膜 ,使其破裂并导致细胞死亡 .探讨了光催化剂的制备条件 (如浸涂浆料浓度、浸涂次数、热处理条件等 )对光催化杀菌效率的影响 .
Two major problems encountered in the photocatalytic disinfection using TiO 2 ultrafine particles are the counting of the bacteria number and the recovery of the photocatalyst particles from the purified water. A novel TiO 2 photocatalyst immobilized on a glass spring support was developed for solving the problems. The catalyst was used in the photocatalytic disinfection of E.coli in water under the irradiation of blue-black UV light. The disinfection efficiency with UV light in the presence of TiO 2 is much higher than that with UV light only. There is an induction period of about 15 min at the beginning of the photocatalytic disinfection process. The SEM and TEM photographs of the bacteria taken at different photocatalytic reaction time show that the photocatalytic reaction takes place on the cell walls and cell membranes of bacteria, breaking and then killing the cells. The effects of catalyst preparation conditions on the photocatalytic disinfection were investigated. The TiO 2 slurry concentration, dip-coating cycle, and heat treatment have influence on the disinfection efficiency. High TiO 2 slurry concentration results in more non-uniform distribution of TiO 2 on the support and high calcination temperature makes the ultrafine TiO 2 particles agglomerate and sinter. The disinfection efficiency is improved with increasing dip-coating cycle. The optimum conditions for the preparation of the immobilized photocatalyst are 2% TiO 2 slurry concentration, 4 dip-coating cycles, and calcination at 400 ℃ for 2 h.