Simple preparation method of coating photocatalyst containing titanium dioxide nano-crystal grains

Abstract

The invention discloses a simple preparation method of a coating photocatalyst containing titanium dioxide nano-crystal grains. The method comprises the following steps: preparing TiOSO4.2H2O into clear solution; taking deionized water as base solution; titrating TiOSO4 settled solution and 3mol / L ammonia into the base solution, keeping pH in the range from 8 to 9 to obtain precipitate suspension; stirring and aging for 30min; washing with the deionized water for 3-5 times to eliminate NH4 and SO4; separating solid from liquid; diluting precipitate to 0.05-0.2mol / L; selecting H2O2 solution as a peptizing agent, dropping the peptizing agent into the suspension with the Ti / H2O2 mol ratio of 1:4-6, and stirring; standing the reaction solution for 24h; processing the reaction solution by hot water of 93-100 DEG C for 4-10h, cooling to the room temperature to obtain coating titanium dioxide photocatalyst containing nano-crystal grains and having higher visible light activity. The method is realized by a normal-pressure low-temperature water processing and aging technology, and the obtained photocatalyst is free from organic solvent, has low cost, substantially neutral spraying agent and strong adhesion on a plurality of base materials.

Description

technical field [0001] The invention relates to a spray-coated photocatalyst, in particular to a method for preparing a coated photocatalyst containing nanometer TiO2 anatase crystal particles by using complexation and peptization of inorganic salts. Background technique [0002] The commonly used supported titanium oxide-based photocatalysts are usually loaded onto the substrate by powder bonding method or sol-gel technology. Pollution of the environment; the raw materials used in sol-gel technology are alkoxides and inorganic salts TiCl 4 , the alkoxide is expensive, contains a large amount of organic solvent or complexing agent, and the acidity of the sol is strong, and the metal substrate is limited; although TiCl 4 The cost of raw materials is reduced, but due to the TiCl 4 It is easy to absorb moisture in the air, hydrolyze and emit acidic smoke, polluting the working environment; in addition, the visible light catalysis is not very high (generally 8 hours of light, ...

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Problems solved by technology

[0003] The purpose of the present invention is to overcome the disadvantages of the prior art that the process is complicated, and it is difficult to apply and construct the living room, taxi cab, etc. that are not convenient for heat treatment, and to provide a further simplified process equipment and operation technology, using normal pressure and low temperature water treatment aging technology, reduce the cost of photocatalyst, the product itself contains nano-anatase crystal grains and a small amount of peroxy, and has a method of pure water solvent coating type titanium oxide photocatalyst with higher visible light activity