TiO₂-based Composite Material And Its Application In Photocatalytic Degradation Of Gaseous Benzene

As people environmental and health awareness increased, volatile organiccompounds in air pollution, especially indoor air pollution take more and more people’sattention. Traditional air purification technology takes physical and chemical adsorptionmeans to reduce airborne particles or gases but it can’t really remove these contaminants.As heterogeneous photocatalytic oxidation technology can break down the volatile organiccompounds into CO₂and H₂O completely at room temperature and atmospheric pressure,it is a technology that has caused extensive attention in recent years. Because of its goodoptical properties TiO₂is widely used in the field of photocatalytic. In this paper, toimprove the optical activity of TiO₂nanomaterials, we modified the TiO₂nanomaterials byseveral ways.In this dissertation, TiO₂nanoparticles were prepared via hydrothermal method andprecipitation method. Hydrothermal synthetised TiO₂nanoparticles composite of differentmetal, TiO₂nanoparticles those supported on MSS and ZSM-5. Effects of differentmodified methods on the structure, morphology and photocatalytic ability of the productswere discussed in detail.TiO₂nanoparticles were composite of different metal oxide. Effects of different metaloxide and hydrothermal temperature and solvent on the structure and morphology of theproducts were characterized in detail. Experimental results had shown that ZnO/TiO₂hasgood shape and structure, and gets the best catalytic activity which is better than thestandard sample P25. The sample under200℃gets the best catalytic activity. Thesamples under180℃,200℃and215℃have better catalytic activity than the standardsample P25. Sulfates cannot effectively be templates under binary alcohol system.TiO₂nanoparticles were supported on MSS and ZSM-5. Effects of different loadmethod and calcination temperature and carrers on the structure and morphology of theproducts were characterized in detail. Experimental results had shown that thephotocatalyst made by hydrothermal obtained TiO₂-MSS microsphere with diameter ofabout1μm, microsphere was composed of particles of elongated shape. When we useprecipitation method to make TiO₂-MSS, we got TiO₂-MSS microsphere with a smooth surface, and all the samples showed crystalline form of anatase. As the calcinationtemperature increased, degree of crystallinity of the product also would increase. TiO₂sample calcined at600oC exhibited the highest photocatalytic activity, whosephotocatalytic activity was higher than that of Degussa P25. The photocatalytic activity ofthe TiO₂nanoparticles which supported on ZSM-5were evaluated by the photocatalyticdegradation of gaseous benzene under UV-light irradiation in air, it was found that itsphotocatalytic activity was as good as that of Degussa P25.