Kinetic analysis of photocatalytic oxidation of gas-phase formaldehyde over titanium dioxide

被引：62
作者：
Liu, HM [1 ]
Lian, ZW
Ye, XJ
Shangguan, WF
机构：
[1] Shanghai Jiao Tong Univ, Inst Refrigerat & Cryogen, Shanghai 200030, Peoples R China
[2] Shanghai Jiao Tong Univ, Dept Resource & Environm Engn, Shanghai 200030, Peoples R China
来源：
CHEMOSPHERE | 2005年 / 60卷 / 05期
关键词：
Langmuir-Hinshelwood model; photocatalysis; carbon dioxide; carbon monoxide;
D O I：
10.1016/j.chemosphere.2005.01.039
中图分类号：
X [环境科学、安全科学];
学科分类号：
08 ; 0830 ;
摘要：
Degradation of formaldehyde with different initial concentration over titanium dioxide was carried out in a photocatalytic reactor. Photocatalytic rates were well described by the simplified Langnmir-Hinshelwood model. The kinetic analysis shows that the apparent first-order reaction coefficient is lower and half-life of photocatalysis is longer for low concentration than for high concentration formaldehyde. A network formation model of the photocatalytic products was established. Experimental results and analysis demonstrate that carbon dioxide concentration and carbon monoxide concentration in gas phase vary exponentially with the illumination time and may be even higher than gas-phase formaldehyde concentration if there is much pre-adsorbed formaldehyde in adsorption equilibrium on catalysts before illumination. Carbon monoxide is found to be one of the by-products during formaldehyde photooxidation. (c) 2005 Elsevier Ltd. All rights reserved.
引用
收藏
页码：630 / 635
页数：6
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