Ordered mesoporous polyoxometallate-titanium dioxide composite and preparation method

Abstract

An ordered mesoporous polyoxometallate-titanium dioxide composite and a preparation method belong to the chemical industry field. The composite comprises the following formula: H3PW12O40 / TiO2. The preparation method combines such technologies as sol-gel chemistry, template self-assembly and programmed temperature hydrothermal treatment, etc. The method takes H3PW12O40 as an inorganic former body, a mixture of purity titanium tetraisopropoxide (TTIP) and titanium tetrachloride (TiCl4) as a titanium source and a nonionic surfactant (Pluronic P123) with structure of HO (CH2CH2O)20(CH2CH(CH3)O)70(CH2CH2O)20H) as a structure-guiding agent. The improvement effect of the catalytic property of the composite is very obvious and the life of the catalyst is prolonged.

Description

Technical field: [0001] The invention belongs to the field of chemical industry, and relates to a polyoxometalate composite catalyst and a preparation method. Background technique: [0002] The environmental problems caused by toxic, harmful and refractory organic substances have become a major problem affecting human survival and development in the 21st century. These organic pollutants are difficult to deal with by traditional technologies. Therefore, the research and development of efficient reduction technologies for toxic, harmful and refractory organics has become a major topic of international concern. Photocatalytic degradation technology is considered to be one of the most potential ways to solve this problem, and has become a research hotspot in this field. Recently, the U.S. Environmental Protection Agency has listed photocatalytic technology as the most promising environmental protection high-tech for industrialization, while the Japanese government has formed a...

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Problems solved by technology

The research on the preparation of ordered mesoporous polyoxometalate-titanium dioxide composites and their photocatalytic degradation of brominated flame retardants in water has not been reported, but the results related to this research have been reported, such as combining polyoxometalates Saline solution (H 3 PW 12 o 40 、H 4 SiW 12 o 40 or NaW 10 o 32 ) was added to the titanium dioxide photocatalytic system and found that the photocatalytic degradation activity of the polyoxometalate / titanium dioxide suspension system to 1,2-dichlorobenzene was significantly higher than that of the pure titanium dioxide system [R.O.Ruya, J.L.Ferry, J.Phys.Chem .B 106(2002) 4336], but the shortcoming of this photocatalytic system is that the polyoxometalate is completely dissolved in the aqueous solution and cannot be separated and recycled; adopt sol-gel combined with programmed temperature hydrothermal treatment technology to prepare micropores -Mesoporous biporous polyoxometalate-titanium dioxide composite material is used for photocatalytic degradation of methyl parathion in aqueous solution under visible light, but the pores of this substance are disordered and the pore size distribution is uneven, which affects the improvement of its photocatalytic efficiency[ Li L., Wu, Q., Guo Y., Hu C., Micropor. Mesopor. Mater., 2005, 87, 1-8]

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