甲苯的气相光降解动力学研究  

Photocatalytic Degradation Kinetics of Toluene in the Gas-phase

作　　者：丁鹏[1] 唐艳茹[1] 刘宝林[1] 

机构地区：[1]长春师范学院化学学院,吉林长春130032

出　　处：《长春师范学院学报（自然科学版）》2009年第5期62-65,共4页Journal of Changchun Teachers College

摘　　要：以Bi2O3纳米粒子为气-固光催化剂,研究了甲苯的初始浓度、氧气及光强等因素对其气相光催化氧化降解的影响;采用Langmuir-Hinshelwood动力学模型得到了甲苯光催化降解的反应速率常数和吸附常数;甲苯的初始反应速率随其初始浓度的增加而增大,并最终趋于稳定;随着氧气含量的增加,甲苯的反应速率不断增大,氧量增至20%时,反应速率不再增加。甲苯的反应速率随着光强的增加而增大,光强增至2.5mW.cm-2时,反应速率趋于定值。This investigation concerned the photocatalytic oxidation of toluene over Bi2O3 in the gas - phase. The feasibility studies involved the effects of initial concentration of reactant, oxygen content, water vapor content and light intensity on the photocatalytic reaction. The photocatalytic degradation rate constant and the adsorption constant of toluene were obtained using the Langmuir- Hinshelwood model. The photocatalytic degradation rate increased with increasing the initial concentration of toluene, but maintained almost constant beyond a certain concentration. The reaction rate increased with increasing oxygen content,but for higher than 20% （v/v）, the reaction rate reversed.The photocatalytic degradation rate increased with light intensity but the rate approached to level off when the light intensity rise to 2.5mW· cm^- 2.

关 键 词：甲苯 动力学 Bi2O3纳米粒子 

分 类 号：X505[环境科学与工程—环境工程]