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Process for preparing nano anatase titanium oxide

A nano-anatase and titanium oxide technology, applied in chemical instruments and methods, inorganic pigment treatment, fibrous fillers, etc., can solve the problems of incomplete desorption, increase in cost, and inability to remove, and save washing water and surface activity. The effect of reducing the cost of agents, raw materials and production, and shortening the production process

Inactive Publication Date: 2005-01-19
UNIV OF SCI & TECH OF CHINA
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  • Summary
  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

At present, there is domestic use of metatitanic acid as the main raw material (CN1044463C) to prepare nano-titanium oxide. It is to add a certain amount of ammonium carbonate (generally 3~8%) to wet metatitanic acid, and react with metatitanic acid. Chemisorbed SO in acid 3 reaction to generate ammonium sulfate, and then washed with a large amount of water several times to remove SO 4 2- , since the ammonium carbonate and ammonium sulfate in the aqueous solution are two-way reactions, each has a fixed equilibrium concentration, so as the number of washings increases, only SO 3 decrease, but cannot make SO 3 remove all
There is always a certain amount of SO in the product 3 Remains, at the later heat treatment temperature of 400°C-600°C, the residual SO 3 Can't detach completely
In addition, the preparation process consumes a large amount of washing water and produces a large amount of waste water. The utilization rate of the added ammonium carbonate is not high, and there is a considerable loss, and multiple filtrations make the process lengthy and increase the cost.
This method uses a polymer surfactant to overcome the agglomeration between metatitanic acid particles, which also increases the production cost

Method used

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  • Process for preparing nano anatase titanium oxide
  • Process for preparing nano anatase titanium oxide
  • Process for preparing nano anatase titanium oxide

Examples

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Effect test

Embodiment 1

[0014] Example 1: Weigh 23g of metatitanic acid, add 600ml of water and 3.13g of ammonium bicarbonate to form a mixed aqueous solution, stir for 1 hour, let it stand, filter, and after drying the obtained filter cake, take it out after heat treatment at 650°C for 1 hour , grinding. It is analyzed as anatase titanium oxide by X-ray diffraction (XRD), and its finished product particle size measured by transmission electron microscope is 20-50nm ( Figure 1A , Figure 1B ).

Embodiment 2

[0015] Example 2: Weigh 23g of metatitanic acid, add 600ml of water and 3.89g of ammonium bicarbonate to form a mixed solution, stir for 1 hour, let it stand, filter, and after the obtained filter cake is dried, take it out after heat treatment at 600°C for 1 hour , grinding. It is analyzed as anatase titanium oxide by X-ray diffraction (XDR), and the particle size of finished product measured by transmission electron microscope is 20-50nm ( Figure 2A , Figure 2B ).

[0016] Example 3: Weigh 23g of metatitanic acid, add 600ml of water and 4.51g of ammonium bicarbonate mixed solution, stir for 1 hour, let stand, filter, after the obtained filter cake is dried, take it out after heat treatment at a temperature of 550°C for 1 hour, grind. It is analyzed as anatase titanium oxide by X-ray diffraction (XRD), and the particle size of finished product measured by transmission electron microscope is 15-50nm ( Figure 3A , Figure 3B ).

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Abstract

The invention discloses a process for preparing nano anatase titanium oxide from metatitanic acid as raw material through the steps of, processing ammonium bicarbonate aqueous solution, dipping, agitating, filtering, high temperature heat treatment for disintegrating fractionation.

Description

technical field [0001] The invention relates to a preparation method of nano anatase titanium oxide powder, which belongs to the technical field of fine chemical industry. Background technique [0002] Nano-anatase titanium oxide has a strong quantum size effect or small size effect because its particle size is on the order of nanometers. It has good absorption performance for ultraviolet rays, and the photogenerated electrons and photogenerated holes generated after titanium oxide absorbs ultraviolet rays have low recombination efficiency, strong photocatalytic performance, large specific surface area, and high surface activity. Therefore, nano-anatase titanium oxide has a wide range of applications in photocatalysts, environmental protection functional coatings, functional ceramics, sewage treatment materials, air purification materials, and UV resistance. [0003] In the prior art, the titanium alkoxide hydrolysis method or the high-temperature oxidation method of titani...

Claims

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Application Information

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IPC IPC(8): C09C1/36C09C3/00
Inventor 王大志刘金华
Owner UNIV OF SCI & TECH OF CHINA
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