A preparation of tio 2 Nanocrystalline particle method

Abstract

The application discloses a method for preparing TiO 2 A method for nanocrystalline particles, comprising: dispersing titanate nanotubes in aqueous hydrogen peroxide solution for hydrothermal reaction to obtain anatase phase TiO with monodisperse and high photocatalytic activity 2 nanocrystalline particles. The steps of preparing the titanate nanotubes are as follows: mixing the titanium source and the aqueous sodium hydroxide solution to obtain sodium titanate nanotubes through hydrothermal reaction, and obtaining titanate nanotubes through acid exchange of the sodium titanate nanotubes; or , the titanium source is mixed with potassium hydroxide aqueous solution to obtain potassium titanate nanotubes through hydrothermal reaction, and the potassium titanate nanotubes are obtained by acid exchange to obtain titanate nanotubes; Titanate nanotubes were prepared by anodic oxidation in liquid.

Description

technical field [0001] The invention relates to the field of preparation of functional photocatalyst materials, in particular to a method for preparing TiO 2 Nanocrystalline particle method. Background technique [0002] Titanium dioxide (TiO 2 ) has attracted extensive attention from industry and scientific research circles due to its rich sources, non-toxicity, and good stability. Recently, anatase TiO 2 Considered as one of the most ideal photocatalytic materials, it is widely used in photocatalytic air purification and photocatalytic water treatment. [0003] Anatase phase TiO 2 The photocatalytic efficiency of a particle is closely related to its size, shape, degree of dispersion, crystallinity, etc. Generally speaking, a small particle size has a large specific surface area, can absorb more organic matter, and usually shows a higher photocatalytic efficiency; Similarly, the greater the degree of dispersion of particles, the more conducive to the improvement of pho...

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Problems solved by technology

For example, the preparation of TiO with adjustable particle size by aminolysis method 2 Nanocrystalline particle method (Z. Zhang, X. Zhong, S. Liu, D. Li, M. Han, Angew. Chem. Int. Ed., 2005, 44, 3466, Aminolysis route to monodispersetitananorodswithtunableaspectratio), which enables the preparation of single Well dispersed TiO 2 Nanocrystalline particle method, however, a large amount of octadecene is used as a solvent in the preparation process of this method, and oleic acid and oleylamine are used as reactants, so that the prepared monodisperse TiO 2 Nanocrystalline particles have strong hydrophobicity, which is not conducive to the improvement of photocatalytic efficiency. At the same time, more organic pollution is produced during the preparation process of this method.

[0005] When using water-soluble system to prepare TiO 2 Nanocrystalline particles, the prepared TiO 2 Nanocrystalline particles tend not to be very monodisperse and tend to agglomerate

In addition, in order to limit the hydrolysis rate of the titanium source, the water-soluble system synthesizes TiO 2 It is often necessary to add protective agents in the process of nanocrystalline particles. Such protective agents are usually organic complexes (X.Chen, S.Mao, Chem.Rev., 2007, 107, 2891), and these organic complexes are easy to limit the Prepared TiO 2 Nanocrystalline particles photocatalytic efficiency, but also easy to cause environmental pollution

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