Preparation method of anatase rutile titania photocatalyst

Abstract

The invention involves preparation method of anatase type TiO2 photo-catalytic powder making use principle of liquid phase precipitation method, it mainly includes: providing solution containing titanium, making the solution containing titanium and an acidic or alkaline solution react and purify at room temperature, said alkaline solution can be caustic soda, ammonium hydroxide and potassium hydrate, said acidic solution can be nitric acid, sulfuric acid, phosphoric acid, hydrochloric acid and boric acid. It is analyzed and displayed that by apparatus that, the titanium oxide powder prepared in the invention is anatase type TiO2, and according the photocatalysis experiments and antibiotic testing experiment results, the titanium oxide powder prepared in the invention has good photocatalysis and antibiotic performance.

Description

technical field [0001] The invention relates to an anatase type titanium dioxide (TiO 2 ) powder method, especially a method for synthesizing anatase titanium dioxide powder with mild and simple reaction conditions. Background technique [0002] Titanium dioxide (TiO 2 ) has become the most attractive semiconductor photocatalyst due to its outstanding advantages in structure and properties. It has broad application prospects in photocatalytic reactions and environmental protection, and the crystal form of titanium dioxide has an important impact on its catalytic activity. Among the three crystal forms of titanium dioxide, the brookite type is unstable and is a metastable phase; 2 ) has strong adsorption capacity and high catalytic activity; the recombination speed of electrons and holes on the surface of rutile titanium dioxide is relatively fast, so its catalytic ability is poor. At present, the methods for preparing titanium dioxide mainly include sol-gel method, microe...

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Problems solved by technology

Zhao Wenkuan and others (Zhao Wenkuan, Fang Youling, Acta Physicochemical Science, 18(4)(2002)368), utilized the liquid phase deposition method to hexafluorotitanium ammonium ((NH 4 ) 2 TiF 6 ) and boric acid as raw materials, and at the same time add anatase-type titanium dioxide nanocrystal grains to the deposition solution as a crystallization inducer, and anatase-type TiO can be directly deposited on a glass substrate at a temperature of 35°C-65°C 2 Thin film, but the deposition time is more than 20 hours

[0003] Based on the above, the current preparation of anatase titanium dioxide (TiO 2 ) method of powder or thin film, it is necessary to undergo high-temperature calcination heat treatment above 300°C, or add a crystal nucleus promoter, or under high-temperature and high-pressure synthesis conditions, and lengthy deposition time, to crystallize titanium dioxide to obtain anatase. Mineral-type titanium dioxide not only has complicated operation steps and high energy consumption, but also high-temperature calcination will also cause the agglomeration of titanium dioxide particles and reduce the specific surface area, which is not conducive to the photocatalytic reaction. It still needs to be further solved.

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