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低温等离子体协同光催化去除甲苯反应机理及动力学研究
引用本文:黄碧纯;杨岳;叶代启.低温等离子体协同光催化去除甲苯反应机理及动力学研究[J].华南理工大学学报(自然科学版),2008,36(11).
作者姓名:黄碧纯;杨岳;叶代启
作者单位:华南理工大学环境科学与工程学院
摘    要:采用低温等离子体-光催化技术(NTP-P)进行去除挥发性有机污染物(VOCs)中甲苯气体的研究.主要考察了在等离子体光催化体系中添加O2、Ar情况下,该体系对甲苯去除的作用机制,包括反应机理及宏观动力学分析.结果表明:在发射紫外光的氮等离子体场中(NTP-P-O2)和发射可见光的氩等离子体场中(NTP-P-Ar)TiO2均能提高体系的甲苯去除率,说明等离子体场中产生的紫外光和高能电子均能激活光催化剂TiO2.并且,在NTP-P-Ar体系中甲苯去除率较NTP-P-O2体系下约提高5%,说明在等离子体场中高能粒子对甲苯降解性能的影响要强于紫外光对其的影响.另外,用经典的动力学分析方法,建立了低温等离子体-光催化体系降解甲苯的动力学模型,即kt=-ln(1-x),其中, k=0.05e(E/3.86)-0.108 ( E≥2.97).实验对动力学模型进行了验证,模型计算值和实验值吻合良好.

关 键 词:低温等离子体  光催化  TiO2  甲苯  反应机理  动力学  
收稿时间:2008-1-9
修稿时间:2008-3-31

Studies of reaction mechanism and dynamics for toluene removal by non-thermal plasma-photocatalysis
Grace Huang Yang Yue,Ye.Studies of reaction mechanism and dynamics for toluene removal by non-thermal plasma-photocatalysis[J].Journal of South China University of Technology(Natural Science Edition),2008,36(11).
Authors:Grace Huang Yang Yue  Ye
Abstract:Non-thermal plasma-photocatalysis (NTP-P) was employed to degrade toluene, one of the volatile organic compounds (VOCs). The mechanisms of toluene removal including reaction mechanism and macro-dynamics were analyzed in the case of adding O2 & Ar into the system of NTP-P. The results showed that photocatalyst TiO2 could improve toluene removal rate not only in nitrogen plasma field (NTP-P-O2) which eradiated ultravialet light but also in argon plasma field (NTP-P-Ar) which eradiated visible light. And this accounted for the idea that both UV light and high-energy electron may activate TiO2 in plasma field. Furthermore, the toluene removal rate was 5 percent higher in NTP-P-Ar system than that in NTP-P-O2 system, which stated that the effect of high-energy electrons on degradation performance of toluene was better than that of UV light. In addition, with classical kinetic analysis method, a dynamics model of toluene degradation was established in system of non-thermal plasma-photocatalysis, that is, kt=-ln(1-x), in which, k=0.05e(E/3.86)-0.108 (E≥2.97). Based on the experiments, validation was conducted on the kinetic model. And it’s found that it was consistent between experimental data and calculated data.
Keywords:Non-thermal plasma  Photocatalysis  TiO2  toluene  Reaction mechanism  dynamics
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