期刊
APPLIED CATALYSIS B-ENVIRONMENTAL
卷 132, 期 -, 页码 212-218出版社
ELSEVIER
DOI: 10.1016/j.apcatb.2012.12.001
关键词
Photocatalytic oxidation (PCO); Volatile organic compounds (VOCs); Indoor air quality (IAQ); Air cleaning
资金
- National Nature Science Foundation of China [51136002, 51006057]
- 12th Five-years National Key Technology RD Program [2012BAJ02B-03, 2012BAJ02B-07]
It was found that there were unwanted by-products in the photocatalytic oxidation (PCO) of indoor ppb-level toluene, a typical volatile organic compound (VOC) in indoor air. However, up to now the control mechanism of the generation of the products has not been clear. In this study we address the problem: a titania-coated glass-plate reactor was applied to study the by-products and decomposition rate; the by-products generated under a series of water vapor concentrations were instantaneously identified by proton transfer reaction-mass spectrometer (PTR-MS); the results indicate that water vapor has a significant effect not only on the photocatalytic decomposition rate of toluene, but also on its by-products generation; the competitive adsorption mechanism between water vapor, toluene and its by-products was analyzed. By-products may make the typical Langmuir-Hinshelwood model unfeasible in real application. A health risk assessment of the by-products was also introduced. The results show that the maximum decomposition efficiency does not always lead to minimal by-products and lowest health risk. What it does show is that when evaluating the performance of photocatalytic air purification, health risks posed by the by-products should be the primary concern rather than the decomposition efficiency. (C) 2012 Elsevier B.V. All rights reserved.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据