针阵列电晕放电-光催化-MnO2耦合净化室内VOCs

Plasma-photocatalysis coupled with MnO2 is a new method for indoor air VOCs purification. However, the foundation of decomposition of indoor VOCs by plasma-photocatalysis coupled with MnO2 is still quite weak. Some theoretical and technological problems are left to be solved, such as the unclear coupling purification mechanisms, the low efficiency of the catalytic purification and the unstable catalyst.In this study, we choose benzene, toluene and formaldehyde as research objects and prepared and characterization analysis of F doped Tricrystalline TiO2 and K+ doped MnO2. And at the same time, the experiment of indoor VOCs removal by plasma-photocatalysis coupled with MnO2 will be carried out. Catalyst modification and carrier optimizing are studied to improve catalytic performance and stability of catalyst.GC is used to clarify the relationship between discharge parameter, air parameter ,catalyst morphology as well as VOCs removal efficiency. In order to clarify the coupling purification mechanism as well as the migration and transformation law of VOCs in couple system ,we will use catalyst characterization analysis , diagnosis of radicals concentrations , distribution of catalyst surface and ionization by optical emission spectrum combined with absorption spectrum.The solution of these key problems could provide theoretical and technical support for innovative development of indoor VOCs removal by plasma-photocatalysis coupled with MnO2.

等离子体-光催化-MnO2耦合是一种室内VOCs净化新方法，结合等离子体快速和催化反应选择性好的特点，具有良好的应用前景。但目前该方法降解室内VOCs的研究基础还相当薄弱，仍有理论和技术问题尚未解决，如耦合净化机制仍不明晰，催化净化效率及催化剂稳定性亟需提高等。本项目以苯、甲苯、甲醛为研究对象，制备F离子掺杂三相混晶TiO2和K+掺杂MnO2为催化剂并表征分析，同时将开展等离子体-光催化-MnO2协同降解室内VOCs研究。通过研究催化剂改性及载体优化提高催化性能和稳定性，利用气相色谱研究放电参数、空气参数、催化剂微观形貌等对VOCs去除效率的关系，结合催化剂表征分析，发射光谱和吸收光谱诊断催化剂表面及电离区自由基浓度及分布，探究VOCs在耦合体系中迁移、转化规律，阐明协同净化机理。这些关键问题的解决，能够为等离子-光催化-MnO2协同技术降解室内VOCs的创新发展提供理和技术支持。