低温等离子体结合光催化剂TiO_2去除甲苯  

Removal of Toluene by Non-Thermal Plasma Combined with Photocatalyst TiO_2

作　　者：黄碧纯[1] 杨岳[1] 张晓明[1] 叶代启[1] 

机构地区：[1]华南理工大学环境科学与工程学院,广东广州510006

出　　处：《华南理工大学学报（自然科学版）》2008年第11期27-33,共7页Journal of South China University of Technology(Natural Science Edition)

基　　金：国家自然科学基金资助项目(20577011)

摘　　要：采用低温等离子体-光催化技术(NTP-P)去除挥发性有机污染物(VOCs)中的甲苯气体,考察了在等离子体光催化体系中添加O2、Ar情况下,该体系去除甲苯的作用机理,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(NTP-P-O2/N2)中和发射可见光的氩等离子体场(NTP-P-Ar)中,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;NTP-P-Ar体系中的甲苯去除率较NTP-P-O2/N2体系中的约提高5%,说明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的影响.文中还采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,并通过实验对该动力学模型进行了验证,模型计算值和实验值吻合良好.Non-thermal plasma-photocatalysis （NTP-P） is employed to remove the toluene existing in volatile organic compounds （VOCs）. The mechanisms of toluene removal including the reaction mechanism and the macrodynamics are then analyzed in the case of adding 02 and Ar to the NTP-P system. The results show that photocatalyst TiO2 improves the removal rate of toluene in not only the nitrogen plasma field （NTP-P-O2/N2） eradiating ultraviolet light but also the argon plasma field （NTP-P-Ar） eradiating visible light. This supports the idea that both the UV light and the high-energy electron in the plasma field can activate TiO2. Furthermore, the toluene removal rate in NTP-P-Ar system is 5% higher than that in NTP-P-O2/N2 system, confirming that high-energy electron has greater effect on the degradation performance of toluene, as compared with UV light. Based on the classical kinetic analysis method, a dynamic model of toluene degradation in non-thermal plasma-photocatalysis system is established, whose validity is proved from the consistency between the calculated data and the experimental ones.

关 键 词：低温等离子体 光催化 二氧化钛 甲苯 反应机理 降解动力学 

分 类 号：X51[环境科学与工程—环境工程]