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Method for synthesizing soluble titanium dioxide nano crystal in low temperature

A technology of titanium dioxide and nanocrystals, applied in the direction of titanium dioxide, chemical instruments and methods, titanium oxide/hydroxide, etc., can solve problems such as difficulty in obtaining titanium dioxide nanocrystals, increased difficulty in separation and purification, and unfavorable environmental governance, and achieve excellent water solubility Non-volatility, simple composition, and productivity-enhancing effects

Inactive Publication Date: 2009-05-20
RESEARCH INSTITUTE OF TSINGHUA UNIVERSITY IN SHENZHEN
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] (2) A large amount of resources such as alkali, acid solution and water are consumed, and a large amount of waste water is produced at the same time, which is not conducive to environmental governance
[0007] (3) There are many types of reaction materials, and the product purity is not high
At the same time, it also makes the separation and purification of the product more difficult, and it is difficult to obtain titanium dioxide nanocrystals with higher purity.
[0008] (4) The yield per unit reaction volume is low, and the yield is generally only about 10-25g / l

Method used

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  • Method for synthesizing soluble titanium dioxide nano crystal in low temperature
  • Method for synthesizing soluble titanium dioxide nano crystal in low temperature
  • Method for synthesizing soluble titanium dioxide nano crystal in low temperature

Examples

Experimental program
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Effect test

Embodiment 1

[0036] The volume ratio of each component is V 含钛盐酸溶液 :V 过氧化氢水溶液 :V 碱液 :V 水=1.0:0.3:3.0:1.7, wherein the titanium-containing hydrochloric acid solution is the mixed hydrochloric acid solution of titanium tetrachloride and titanium trichloride (titanium in tetravalent state 4+ Ions and trivalent Ti 3+ ion-to-matter ratio n Ti 4 + : n Ti 3 + = 3.9 , The total substance concentration of the titanium element is 3.8mol / l); Hydrogen peroxide is a chemically pure hydrogen peroxide aqueous solution, and the mass percentage concentration is 30.0%; The lye is a sodium hydroxide solution of 2.0mol / l; Water for deionized water. first according to n Ti 4 + ...

Embodiment 2

[0038] The volume ratio of each component is V 含钛盐酸溶液 :V 过氧化氢水溶液 :V 碱液 :V 水 =1.0:0.1:2.8:2.1, wherein the titanium-containing hydrochloric acid solution is the mixed hydrochloric acid solution of titanium tetrachloride and titanium trichloride ( n Ti 4 + : n Ti 3 + = 1.6 , The total substance concentration of the titanium element is 2.5mol / l); Hydrogen peroxide is a chemically pure hydrogen peroxide aqueous solution, and the mass percentage concentration is 30.0%; The lye is a sodium hydroxide solution of 2.2mol / l; Water for deionized water. The preparation operation of the precursor is the same as that of Example 1. Transfer it to a reflux device in an open system, hydrolyze and crystallize at 155°C for 4.5 hours, cool, centrifuge,...

Embodiment 3

[0040] The volume ratio of each component is V 含钛盐酸溶液 :V 过氧化氢水溶液 :V 碱液 :V 水 =1.0:0.2:3.2:1.5, wherein the titanium-containing hydrochloric acid solution is the mixed hydrochloric acid solution of titanium tetrachloride and titanium trichloride ( n Ti 4 + : n Ti 3 + = 2.4 , The total substance concentration of titanium element is 3.0mol / l); Hydrogen peroxide is a chemically pure hydrogen peroxide aqueous solution, and the mass percent concentration is 30.0%; The lye is a sodium hydroxide solution of 1.8mol / l; Water for deionized water. The preparation operation of the precursor solution is the same as that in Example 1. Transfer it to a reflux device in an open system, hydrolyze and crystallize at 145°C for 7.0 hours, cool, centrifug...

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Abstract

This invention provides a chemical method for synthesizing soluble titanium dioxide nanocrystal at low temperature, characterizing in that: using titanium tetrachloride and titanium trichloride mixed hydrochloric acid solution as titanium source, with hydrogen dioxide and alkaline solution as adjuvant material, applying open system reflux reaction apparatus or closed system low-temperature heat reaction apparatus, leave the reaction for 1-12 h between 100 and 180Deg C. The yield of the titanium dioxide nanocrystal synthesized by this method is 30-70g / l. The obtained titanium dioxide nano particle has an anatase phase structure and a high degree of crystallization. The particle size is homogeneous and the particle diameter is distributed between 3 and 20nm, which is easily dispersed. The titanium dioxide nanocrystal has superior photocatalysis, deodorizing, antibacterial and mildew-resistant properties. This method is characterized of combining hydrolysis, crystallization and dispersion in one step, low reaction temperature, strong apparatus universality, easy-obtained and low cost raw material, and high yield.

Description

【Technical field】 [0001] The invention provides a method for synthesizing titanium dioxide nanocrystals, in particular a method for low-temperature synthesis of titanium dioxide nanocrystals with an anatase phase structure that is easily dispersed, and belongs to the field of nanomaterial preparation. 【Background technique】 [0002] In recent years, with the development of science and technology, it has been found that nanoscale titanium dioxide crystals have excellent photocatalytic properties, that is, they have strong oxidation / reduction properties under ultraviolet (UV) irradiation, and can achieve biorefractory organic pollution. It has the functions of thorough mineralization at room temperature, antibacterial and mildew proof, and ultraviolet shielding. Therefore, the application and synthesis method of titanium dioxide nanocrystals has become a major topic, and scientists from various countries have carried out research from different angles. [0003] At present, mo...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J21/06B01J47/00C01G23/053
Inventor 杨发达李荣先杨建
Owner RESEARCH INSTITUTE OF TSINGHUA UNIVERSITY IN SHENZHEN
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