Application of lanthanum-doped titanium dioxide photocatalyst on toluene removal from SVE exhaust gas

• Main Authors: Jen-Chieh Wei, 魏仁傑
• Other Authors: Ya-Fen Wang
• Format: Others
• Language: zh-TW
• Published: 2018
• Online Access: http://ndltd.ncl.edu.tw/handle/jupt38

碩士 === 中原大學 === 環境工程學系 === 106 === When the soil is polluted by oil and gas, it is mostly treated by gas extraction. The oil and gas pollution is the most polluted by Volatile organic compounds, and among the volatile organic compounds, contained in monocyclic aromatic hydrocarbons (BTEX). Benzene, Toluene, Ethyl-benzene and o-Xylene are prepared by preventing soil gas-contaminated gas from being directly discharged into the atmosphere, and the extracted gas is passed through a pipeline to an exhaust gas treatment device. Most of the existing methods are activated carbon adsorption methods, but this method is cumbersome to recycle and has secondary pollution concerns. Therefore, it is better to use a photocatalytic method that is non-toxic and has no secondary pollution. The results of the study show that the humidity is 60% in humidity of 60% via humidification.1 wt% La-TiO2 (La doping TiO)coating on the glass dish to degrade the toluene effect up to 22.8%.Further, glass balls and glass cloth were used to test the degradation rate of toluene.Under ultraviolet UV-A (wavelength 320~400nm), the test results show that the optimal rate of glass sphere is 15%.In contrast, three pieces of photocatalytic glass fiber cloth can reach 94.84%.Under visible light conditions, photocatalytic glass spheres have no effect. Photocatalytic glass fiber cloth can reach 54.32%, combining the above humidity and carrier conditions.Photocatalytic module was researched and developed on glass fiber cloth by using ambient humidity of 60% and 1 wt% La-TiO2. In addition, from the point of view of cost analysis, the commercial type titanium dioxide-P25 requires only NT$5.8 per gram, and the monolithic photocatalytic carrier is about NT$626. In the selection treatment effect, under the condition of ultraviolet light irradiation, the removal rate of the three-layer carrier cloth is high and up to 94.3% will be the best state. If it is from the processing cost, a layer of carrier cloth will be the best. Choice, but due to the scale of the project and the effect of the treatment, the study can be used to obtain the best treatment effect of the three-layer carrier cloth under the ultraviolet light irradiation. Keywords：volatile organic compounds、monocyclic aromatic hydrocarbons、Photocatalysis、La doping TiO