TiO2-SiO2 oxide composite material and preparation method thereof

Abstract

The invention relates to the technical field of inorganic metal oxide materials, and particularly discloses a TiO2-SiO2 oxide composite material and a preparation method thereof. The preparation method comprises the steps: dissolving a surfactant in a hydrochloric acid solution with the concentration of 1.5-1.7 mol / L; adding alkane, tetraethoxysilane and titanium tetrachloride into the mixed solution for hydrolysis; carrying out hydrothermal treatment on the hydrolyzed mixture at a temperature of 100 + / -5 DEG C; filtering the mixture subjected to hydro-thermal treatment to obtain a filtrate, and drying the filtrate to obtain solid powder; and roasting the solid powder at a temperature of 400 + / -5 DEG C to obtain the TiO2-SiO2 oxide composite material. The TiO2-SiO2 oxide composite materialwith the specific surface area of 330-560 m < 2 > / g and the pore diameter of 6.8-7.3 nm is obtained by adopting the preparation method disclosed by the invention, TiO2 particles are dispersed in SiO2, and the TiO2 particles are rutile crystalline phases.

Description

technical field [0001] The invention relates to the technical field of inorganic metal oxide materials, in particular to a TiO 2 -SiO 2 Oxide composite materials and methods for their preparation. Background technique [0002] Titanium oxide material has the advantages of non-toxicity, low price, and good oxidation resistance. It is a semiconductor photocatalytic material that has received wide attention, and is widely used in the photocatalytic elimination of pollutants. At the same time, titanium oxide materials are also used as supports for various heterogeneous catalysts. The electron-hole binding ability of pure titanium oxide materials is relatively good, which leads to the limitation of the improvement of its photocatalytic activity. In addition, the specific surface area of ​​pure titanium oxide materials is relatively small, generally only reaching 10-50m 2 / g, which also limits its application as a catalyst carrier. [0003] Combining titanium oxide with other ...

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Problems solved by technology

But in this way, only the mixed crystal phase of TiO with coexistence of anatase crystal phase and rutile crystal phase can be obtained. 2 -SiO 2 oxide composite materials; and such a long-term high-temperature calcination process tends to greatly lead to SiO 2 The sintering of the skeleton makes the TiO 2 -SiO 2 The pores of the oxide composite material are burnt down, and the specific surface area is greatly reduced.

The anatase crystal phase and the rutile crystal phase are different in the principle and effect of the two crystal phases, and there is no report to obtain TiO2 in which the titanium dioxide species is the pure rutile phase. 2 -SiO 2 Oxide composite material and its preparation method

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