Title: Concentration Degradation of Toluene Utilizing Photocatalysis of TiO 2 Accompanied with Ozone
Abstract: This study used experimental measurements and numerical simulations to explore the use of ozone accompanied with TiO2 to improve the degradation rate of toluene. Different circulating airflow rates (0.1 m3/s, 0.12 m3/s and 0.15 m3/s) and initial toluene concentrations (40 ppm and 80 ppm) were used as parameters to explore the indoor toluene concentration degradation effect of the photo-catalysis of TiO2 accompanied with ozone (O3) under the irradiation of ultraviolet light bulbs. According to the research findings, when the circulating airflow rate was greater (0.15 m3/s), no matter if the initial toluene concentration was 40 ppm or 80 ppm, as well as either with or without ozone, the se of TiO2 could reduce the toluene concentration to below 10 ppm within 40 minutes. With the greater flow rate, the concentration degradation efficiency could also be enhanced under different flow rates. The experimental results showed that regardless of the operational conditions, the degradation effect of UV/TiO2/O3 on the indoor toluene concentration was superior to that of the method using UV/TiO2. It was also found that for medium and low circulating airflow rates (0.1 m3/s and 0.12 m3/s), the addition of ozone could efficiently enhance the TiO2 degradation of VOCs. In the case of a circulating airflow rate of 0.12 m3/s, the UV/TiO2/O3 degradation effect was better. Based on the experimental results, this stud y established a theoretical analysis model for the application of UV/TiO2/O3 in reducing the indoor concentration of toluene and conducted numerical simulations according to the proposed model, with very good simulation results. The proposed theoretical model could be used as a tool for the early design of air-conditioning systems to purify indoor air quality.
Publication Year: 2013
Publication Date: 2013-01-01
Language: en
Type: article
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