Rapid preparation method of high-dispersible TiO2 nano crystal sol

Abstract

The invention relates to a rapid preparation method of a high-dispersible TiO2 nano crystal sol, belonging to the technical field of semi-conductor nano crystal preparation. The preparation method is as follows: dissolving inorganic titanium salt serving as a titanium source in a corresponding solvent so that a solution with a certain concentration is prepared; adding alkali liquor to regulate the pH value to 7.5-8.5 and generate a precipitate; washing the precipitate, carrying out complexing reflux dispergation by utilizing H2O2 so as to obtain a peroxotitauium acid sol; and transferring the peroxotitauium acid sol into a hermetic high-temperature kettle of a microwave sampling system, and crystallizing for a while at a certain power and temperature, so that finally, the TiO2 nano crystal sol is prepared. The advantages of solvent heat and microwave methods are integrated in the method provided by the invention, the zeta potential of the obtained sol is between 50 and 70 mV, and the obtained sol has higher dispersibility; and in the preparation process, no surfactant is introduced, high-temperature calcination is not needed, and the obtained sol has a wide application prospect in the field of photocatalysis.

Description

technical field [0001] The present invention relates to a kind of highly dispersed TiO 2 The invention discloses a rapid preparation method of nanocrystalline sol, which belongs to the field of low-temperature preparation of semiconductor nanomaterials. The preparation process is simple, fast, low energy consumption, and the prepared TiO 2 The nanocrystalline sol has good dispersion and high photocatalytic activity. Background technique [0002] TiO 2 It is an important semiconductor photocatalytic material, which has the advantages of high photocatalytic activity, acid and alkali resistance and photochemical corrosion, low cost, and non-toxicity. It has wide and potential applications in air purification and sewage treatment. Usually nano TiO 2 The preparation method is divided into gas phase method and liquid phase method. Among them, the gas-phase method has a small range of application due to large energy consumption, high cost and complicated process, while the liq...

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Problems solved by technology

Chinese patent CN1287099A introduces a microwave heating titanium solution to prepare nano-TiO 2 The method uses microwave heating titanium solution to make it hydrolyzed, and the precipitate is separated, washed, dried and calcined to obtain spherical nano-TiO 2 , the disadvantage of this method is that although the microwave speeds up the hydrolysis process, the resulting product finally needs high-temperature calcination to promote its crystallization

Chinese patent CN101468812A adopts nano-TiO 2 Particles are in contact with alkali metal compounds, organic solvents and surfactants, and rod-shaped TiO is prepared by microwave heating 2 Nanocrystalline, but this method requires the addition of surfactants to improve the dispersion of the product

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