光催化降解馆藏文物环境的低浓度NOx和有机酸

Photocatalytic Treatment of Low Concentration of Indoor Air Pollutant under Solar Light in Museum

馆藏文物环境中氮氧化物和有机酸对文物材料的破坏性很大,净化难度很大。研究了气-固相下光催化耦合净化馆藏文物环境低浓度NOx与有机酸的效果,探讨了动力学过程。实验结果表明:负载型TiO2/γ-Al2O3光催化剂在可见光照条件下对馆藏文物保护环境下的有机酸和NOx都有良好的降解效果,可达到97%以上。净化效率受到初始浓度的影响较大,但在低浓度下NOx和有机酸之间没有明显的竞争抑制作用,光催化反应过程遵循表观一级反应动力学。

Airborne NOx and organic acids have great deteriorate effects on relic conservation, but they are very difficuh to be treated because of their trace concentration, complicated components and strict requirements for purification. A continuous TiO2 gas - solid photo - reactor utilizing visible light was investigated for coupling removal of NOx combined with organic acid, and the kinetic mechanism was also discussed. Results showed that there were good removal efficiency of both NOx and organic acids for the TiO2/γ -Al2O3 photocatalyst illuminated by solar light. The removal efficiency both roached over 97%. The removal efficiency was influenced by initial concentration, but no clear inter - inhibitation effects were observed between NOx and organic acids at ppb level. The photo - catalytic oxidation process of NOx was found to follow first - order reaction.