纳米TiO_2/SMF电极等离子体催化降解油漆废气的研究

Plasma-Assisted Catalytic Decomposition of Paint Exhaust with Nano-TiO_2/SMF Electrode

针对油漆生产、加工行业产生的主要有机污染物二甲苯,采用低温等离子体催化技术进行降解实验。实验过程中,使用新型材料烧结金属纤维(sintered metal fiber,SMF)作为介质阻挡放电(dielectric barrier discharges,DBD)反应器的放电电极,并对烧结金属纤维电极进行负载纳米Ti O2处理,研究纳米Ti O2/SMF电极对二甲苯的降解效果。结果表明,纳米Ti O2/SMF电极比未处理的SMF取得了更高的降解效率,二甲苯降的解效率最高可达92.1%;并且载气中的氮气可以极大地提高纳米Ti O2/SMF催化电极的催化活性。实验也详细地考察了电压、负载量、载气和湿度对SMF及Ti O2/SMF电极辅助降解二甲苯的影响。

Decomposition of xylene, the major constituent of paint exhaust, was conducted in the lab by NTP （non-thermal plasma）. The novel SMF （sintered metal fiber） and its modified material nano-TiO2/SMF were adopted as the electrodes of the DBD （dielectric barrier discharges） reactor. Results showed that the maximum decomposition efficiency with nano-TiO2/SMF electrodes could reach 92.1%. It is significantly higher than the efficiency obtained with regular SMF electrodes. Moreover, it was observed that nitrogen in carrier gas considerably promoted the activity of the catalytic performance of nano-TiO2/SMF electrodes. The effects of TiO2 loading, the composition of carrier gas, the peak voltage of electrodes, and relative humidity on the decomposition efficiency of xylene were also investigated in detail.