Photocatalytic inactivation of Cryptosporidium parvum with TiO2 and low-pressure ultraviolet irradiation

被引：44
|
作者：
Ryu, Hodon [1 ]
Gerrity, Daniel [1 ]
Crittenden, John C. [1 ]
Abbaszadegan, Morteza [1 ]
机构：
[1] Arizona State Univ, Natl Sci Fdn, Water Qual Ctr, Dept Civil & Environm Engn, Tempe, AZ 85287 USA
来源：
WATER RESEARCH | 2008年 / 42卷 / 6-7期
基金：
美国国家科学基金会;
关键词：
Cryptosporidium inactivation; UV/TiO2; photocatalysis; integrated cell culture quantitative PCR;
D O I：
10.1016/j.watres.2007.10.037
中图分类号：
X [环境科学、安全科学];
学科分类号：
08 ; 0830 ;
摘要：
This study investigated the efficacy of low-pressure ultraviolet (UV) irradiation and the synergistic effect of UV/titanium dioxide (TiO2) photocatalysis on Cryptosporidium parvum oocyst inactivation. At UV doses of 2.7, 8.0, and 40 mJ/cm(2), oocyst inactivation was 1.3, 2.6, and 3.3log(10), respectively Reactive oxygen species (ROS) generated by longwave UV radiation (> 315 nm) and TiO2 achieved less than 0.28-log inactivation. However, the synergistic effect of germicidal (254 nm) UV and TiO2 resulted in 2-log and 3-log oocyst inactivation with 4.0 and 11.0 mJ/cm(2), respectively. Therefore, using TiO2 in combination with UV reduced the dose requirement for 3-log inactivation by 56%. An approximate 1-log decrease in inactivation of oocysts was observed with nanopure water in comparison to buffered water, whereas changes in pH from 6 to 8 had little effect on the photocatalytic inactivation of oocysts in either matrix (P>0.1). (c) 2007 Elsevier Ltd. All rights reserved.
引用
收藏
页码：1523 / 1530
页数：8
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