Photocatalytic Oxidation of Escherischia coli, Aspergillus niger, and Formaldehyde under Different Ultraviolet Irradiation Conditions

被引：76

作者：

Chen, Fengna ^{[1
]}

Yang, Xudong ^{[1
]}

Wu, Qiong ^{[2
]}

机构：

[1] Tsinghua Univ, Dept Bldg Sci, Beijing 100084, Peoples R China

[2] Tsinghua Univ, Dept Biol Sci & Biotechnol, Beijing 100084, Peoples R China

来源：

ENVIRONMENTAL SCIENCE & TECHNOLOGY | 2009年 / 43卷 / 12期

基金：

中国国家自然科学基金;

关键词：

LIGHT-INTENSITY; GASEOUS FORMALDEHYDE; ESCHERICHIA-COLI; TIO2; DISINFECTION; INACTIVATION; WATER; FILM; AIR; DEGRADATION;

D O I：

10.1021/es900505h

中图分类号：

X [环境科学、安全科学];

学科分类号：

08 ; 0830 ;

摘要：

Ultraviolet (UV) light irradiation, including the type of light source, light intensity, and irradiation dosage, directly affects the photocatalytic reaction rate and energy consumption. In this study, we investigated the photocatalysis effect of decomposing organic matter and inactivation bacteria and fungi under various conditions of UV sources (UVA and UVC) and light intensities (from 0.01 to 10 W/m(2)). The effect of light intensity was evaluated by photocatalytic reaction rate and UV dosage defined as a product of light intensity and irradiation time necessary to achieve a certain reduction. The results confirmed the positive effect of increased light intensity on photocatalytic reactions and suggested that within the light intensity range applied in this study low light intensity with long exposure time has higher light utilization efficiency compared to that of high light intensity with short exposure time. A conception for selection of the appropriate light intensity and dosage for effective degradation of pollutants, while saving energy, was provided.

引用

页码：4606 / 4611

页数：6

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