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Preparation method of soluble titanium dioxide nano-crystal

A titanium dioxide and nanocrystal technology, applied in titanium dioxide, chemical instruments and methods, titanium oxide/hydroxide, etc., can solve the problems of waste of resources such as acid solution, insufficient greening and environmental protection, etc., and achieve greening and broad market. Application foreground, uniform particle effect

Inactive Publication Date: 2006-06-14
RESEARCH INSTITUTE OF TSINGHUA UNIVERSITY IN SHENZHEN
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the inorganic acid produced during the hydrolysis of titanium-containing inorganic salts, a large amount of lye is required to neutralize them, and then additional inorganic acids must be used for peptization and crystallization, or hydrothermal crystallization, or the formation of peroxotitanic acid solution After crystallization, it causes a great waste of resources such as lye and acid, which is not green enough and environmentally friendly.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] When reaction temperature is 140 ℃, the ratio of volume and fraction of reaction material is: V (titanium-containing inorganic salt solution in trivalent state): V (hydrogen peroxide): V (lye): V (distilled water)=14.20: 0.01 : 42.85: 42.85, wherein the titanium-containing inorganic salt of the trivalent state is titanium trichloride, and the mass percent concentration is 15%; hydrogen peroxide is commercially available chemically pure 30.0% H 2 o 2 Solution; lye is sodium hydroxide solution, the concentration of the substance is 2.0mol / l. At room temperature, first dilute the trivalent titanium-containing inorganic salt solution with given distilled water, then mix hydrogen peroxide with it evenly, then add lye and stir evenly, and transfer the resulting reaction solution to the open system In the reflux device, react at a temperature of 140° C. for 6 hours, cool naturally, centrifuge, recover the supernatant, and wash and dissolve the lower precipitate with distilled...

Embodiment 2

[0019] Reaction temperature is 100 DEG C, and the volume fraction ratio of reaction material is identical with embodiment 1, wherein the titanium-containing inorganic salt of trivalent state is titanous sulfate, and mass percent concentration is 20%; Hydrogen peroxide is commercially available chemically pure 30.0 %H 2 o 2 Solution; lye is a mixture of sodium hydroxide and potassium hydroxide in a molar ratio of 1:2, and the concentration of the substance is 2.0mol / l. At room temperature, first dilute the trivalent titanium-containing inorganic salt solution with given distilled water, then mix hydrogen peroxide with it evenly, then add lye and stir evenly, and transfer the resulting reaction solution to the open system In the reflux device, react at a temperature of 100° C. for 6 hours, cool naturally, and centrifuge to recover the supernatant, and wash and dissolve the lower precipitate with distilled water. The XRD spectrum shows that the obtained titanium dioxide nanocry...

Embodiment 3

[0021] The reaction temperature is 120 DEG C, and the volume fraction ratio of the reaction materials is the same as in Example 1, wherein the titanium-containing inorganic salt in the trivalent state is a 40:60 mass ratio mixture of titanium trichloride and titanium sulfate, and the mass percent concentration is 18 %; Hydrogen peroxide is commercially available chemically pure 30.0% H 2 o 2 Solution; lye is potassium hydroxide solution, the concentration of the substance is 2.0mol / l. Operation is the same as in Example 1. The XRD spectrum shows that the obtained titanium dioxide nanocrystals are anatase phase structure, and the particle size is 8-35nm as measured by TEM.

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Abstract

A soluble TiO2 nanocrystal is prepared from 3-valence Ti-contained inorganic salt, hydrogen peroxide and alkali solution through open reflux reaction or closed hydrothermal reaction at 60-220 deg.C for 1-24 hr. Its advantages are uniform granularity (5-40 nm), high solubility or dispersity in water, alcohol and ketone, high photocatalytic activity and good deodoring, antibacterial and antimildew performance.

Description

【Technical field】 [0001] The invention provides a method for preparing soluble titanium dioxide nanocrystals, in particular a method for preparing soluble titanium dioxide nanocrystals with photocatalytic activity and anatase phase structure, belonging to the field of nanomaterial preparation. 【Background technique】 [0002] Titanium dioxide nanocrystals have attracted widespread attention and attention because of their advantages such as moderate band gap energy, high photocatalytic activity, photostability and chemical stability. It has been widely researched and practically applied in the fields of antibacterial and antifungal. [0003] The traditional preparation methods of titanium dioxide micro / nano crystals, such as sulfuric acid method, sol-gel method, chloride method, etc., usually include high-temperature calcination and crystallization steps, which consume a lot of energy on the one hand, and on the other hand, the titanium dioxide crystals produced are easy to G...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J21/06C01G23/053C30B7/10
Inventor 杨发达李荣先陈丽琼杨建王臻
Owner RESEARCH INSTITUTE OF TSINGHUA UNIVERSITY IN SHENZHEN
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