Photocatalytic and UV Characterization of TiO_2 Nanofluid Prepared by SANSS on HVAC

摘要

This study develops a measurement method for testing the efficiency of photocatalysts in the degradation of NH_3 gaseous concentrations. The catalysts used in this study are the same as those used previously in our UV/VIS spectrophotometer. Reaction measurements were carried out at 27℃ and 17℃ under ambient pressure on Heat Ventilating and Air Conditioning (HVAC) system. Quartz plates were coated with TiO_2 nanocatalyst. Then the plate was put in the stable reaction cell under different flow rates of circulation. The experiment gives a direct and simple measurement of ammonia flux and hence of overall ammonia emission rate. The results reveal that the Submerged Arc Nanoparticle Synthesis System (SANSS) TiO_2 nanocatalyst has excellent degradation efficiency towards NH_3, so that when it is exposed to UV irradiation for 60 minutes, the gaseous concentration can be reduced to 10% of the original concentration. In addition, the rate constant of the degradation reaction of the self-made TiO_2 nanocatalyst towards NH_3 is as high as 0.039min~(-1).