Preparation And Photocatalytic Degradation Activity Of Isopropanol Of TiO₂-based Composite Photocatalysts

The volatile organic compounds(VOCs)are widely used in domestic activities.The extensive uses lead to air pollution.And the air pollutants impact human health,comfort and productivity.The demand for VOC control method is increasing.Among these detoxification measures,heterogeneous semiconductor photocatalytic oxidation has been found to be an efficient way to transform many of these VOCs into nontoxic compounds.TiO2 is considered to be one of the most promising photocatalyst for practical application because of its superior photocatalytic activity,chemical stability,low cost,and nontoxicity.Isopropanol(IPA),a kind of typical VOCs,has been selected as the target reactant to explore the impact of TiO2-based composite photocatalysts on the process of photocatalytic degradation of IPA.Crystal form is one of the most important influence factors which can influence the photocatalytic efficiency of TiO2.To explore the effect of phase composition on the photocatalytic efficiency various phase ratio of TiO2 surface,a series of TiO2 nanoparticles with phase junctions controlling were synthetized by hydrolysis of TiCl4 in hydrochloric acid,an ionic liquid-assisted method was used during this process.The possible separation and transfer mechanisms of the photogenerated electron-hole pairs as well as the photoelectric property of mixed phase TiO2 nanoparticles were explored.The mixed-phase TiO2 with controllable ratio of anatase and rutile were used and the investigation has been focused on the role of the phase ratio of TiO2 on the photocatalytic activity and the possible degradation pathway of the photo-degradation of 2-propanol.Poor adsorption of reactants and intermediates as well as low mineralization rate greatly restricts the application of common semiconductor photocatalyst TiO2 for air purification.HKUST-1@TiO2 core-shell structure with ultrathin porous shell was synthetized to platform for enhanced photocatalytic degradation of isopropanol.The impact of HKUST-1@TiO2 core-shell structures on the process of photocatalytic degradation of IPA had been explored.Structural band-gap in g-C3N4 was tuned by changing the calcination temperature with melamine as precursor in an inert Ar gas atmosphere.Effective visible-light-driven photocatalyst of anatase TiO2 hybridized with g-C3N4.The band gap structure of materials was analysed by means of DRS and MS.The impact of C3N4/TiO2 on the process of photocatalytic degradation of IPA under visible light had been explored.Investigation has been focused on the role of the band gap structure and surface characteristics of C3N4/TiO2 on the photocatalytic activity of the photo-degradation of 2-propanol.