Study On The Preparation And Application Of Photocatalytic Active Environmental Mineral Materials

Photocatalysis oxidation process is a kind of advanced oxidation process which has developed for several decades. It is a process of organic pollutant degradation under the action of UV and photocatalyst. Most organic pollutants can be degraded to non-polluting small molecules such as CO₂, H₂O etc. Therefore, Photocatalysis oxidation process applied to environment pollution control has become the hotspot of environmental protection research.The key of using this technology is the preparation of photocatalyst. Therefore, preparing effective and economic photocatalyst is a problem which researchers care of and need to resolve. Because TiO₂ has high photocatalysis activity, low energy consumption, simple operation, gentle reaction condition, extensive application, with reduced secondary pollution etc., it is indeed a photocatalyst which has the best perspective and has become the hotdspot of the research.This paper introduced the theory of photocatalysis of semiconductor, the principle of TiO₂ photocatalysis, preparation of nanometer TiO₂, the approach of improving the photocatalytic activity of TiO₂, the application of TiO₂, and the research of loading techniques of TiO₂.Natural rutile photocatalyst was prepared with the method of grinding and sizing. This photocatalyst was used to treat wastewater containing azo dye. It shows that natural rutile photocatalyst has certain photocatalytic action on azo dye.Minerals of different structures were used to prepare mineral loading photocatalyst and study the effect of minerals and TiO₂. on wastewater treatment. Using these photocatalyst to treat wastewater containing azo dye showed that these photocatalysts have high decoloration effect.. The main action of TiO₂ loaded on stilbite, rectorite, kaolin on azo dye was adsorption . The main action of quartz loading TiO₂ photocatalyst on azo dye was photocatalysis.Surface modification was made on quartz with ( OCH₃ )₃Si(CH₂)₃SH by dry process. The radical of -SH was oxidized to -SO₃^- and electrostatic self -assembled TiO₂ was made on the surface of quartz . By this way the self-assembled TiO₂ photocatalyst on quartz was prepared. Using this photocatalyst to treat wastewatercontaining azo dye showed that this photocatalyst has high decoloration effect.. The main action of this photocatalyst on azo dye is photocatalysis.XRD and XPS were used to study the composition of the photocatalyts . U V-vis and FTIR were used to analyse the mechanism of the photocatalytic action of the nano titanium dioxide photocatalyts.