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Preparation method of {001} face exposed titanium dioxide nanocrystals

A titanium dioxide and nanocrystal technology, applied in the directions of titanium dioxide, titanium oxide/hydroxide, nanotechnology, etc., can solve the problems of large particle size and small specific surface area of ​​titanium dioxide nanocrystals, and achieve simple equipment and process, and cheap and easy raw materials. obtainable, easy-to-operate effect

Inactive Publication Date: 2012-09-19
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The present invention aims to solve the technical problem of large particle size and small specific surface area of ​​{001} surface-exposed titanium dioxide nanocrystals prepared by existing methods, and provides a preparation method for {001} surface-exposed titanium dioxide nanocrystals

Method used

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  • Preparation method of {001} face exposed titanium dioxide nanocrystals
  • Preparation method of {001} face exposed titanium dioxide nanocrystals
  • Preparation method of {001} face exposed titanium dioxide nanocrystals

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specific Embodiment approach 1

[0027] Specific implementation mode 1: In this implementation mode, a method for preparing titanium dioxide nanocrystals exposed on the {001} surface, the specific steps are as follows:

[0028] 1. Add titanium salt to ethanol or isopropanol to prepare 50mL-100mL alcohol solution with a concentration of 0.1mol / L-0.5mol / L;

[0029] 2. Drop the alcohol solution prepared in Step 1 into 60mL-120mL deionized water under stirring conditions, and then stir for 30 minutes at a stirring speed of 300-1000 rpm at a water bath temperature of 60°C-90°C ~100 minutes, add 50mL~300mL of 0.5mol / L~5.0mol / L alkali solution, seal it, then continue to stir at 60℃~90℃ for 4 hours~12 hours, centrifuge to separate the white precipitate, and wash the white precipitate with deionized water Precipitate for 3 to 5 times until the pH value of the supernatant is neutral to obtain protonated hydrated titanic acid;

[0030] 3. Wash the protonated hydrated titanic acid with alcohol for 3 to 5 times, then tra...

specific Embodiment approach 2

[0033] Embodiment 2: This embodiment differs from Embodiment 1 in that the titanium salt described in Step 1 is titanium tetrachloride, titanium sulfate, titanium oxysulfate, butyl titanate or isopropyl titanate. Others are the same as in the first embodiment.

specific Embodiment approach 3

[0034] Embodiment 3: The difference between this embodiment and Embodiment 1 is that the alkali solution described in step 2 is sodium hydroxide solution, potassium hydroxide solution or sodium carbonate solution. Others are the same as in the first embodiment.

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Abstract

The invention relates to a preparation method of nanocrystals, particularly a preparation method of {001} face exposed titanium dioxide nanocrystals. The invention solves the technical problems of large particle size and small specific areas in the {001} face exposed titanium dioxide nanocrystals prepared by the existing method. The method comprises the following steps: 1. preparing protonized titanic acid hydrate; 2. washing the protonized titanic acid hydrate with alcohol, transferring into a polytetrafluoroethylene hydrothermal kettle, adding alcohol and a hydrofluoric acid water solution, keeping the temperature, carrying out centrifugal separation to obtain a precipitate, washing with water, washing with alcohol, drying, and grinding to obtain the {001} face exposed titanium dioxide nanocrystals. The titanium dioxide product obtained by the method is a pure anatase phase, the exposure rate of the {001} face is 26-66%, the maximum specific area is 155m<2>g<-1>, and the minimum average particle size of the crystals is 11nm.

Description

technical field [0001] The invention relates to a preparation method of nano crystals. Background technique [0002] In recent years, photocatalytic technology, as one of the most effective methods to control environmental problems, has attracted widespread attention from all over the world. Titanium dioxide photocatalyst has become the most ideal catalyst in environmental treatment because of its advantages of low price, non-toxicity, high catalytic activity, strong oxidation ability, good chemical stability, wear resistance and recyclability. TiO 2 The photocatalytic performance mainly depends on the crystal phase, exposed crystal plane, crystal size and specific surface area. Common TiO 2 There are three crystal forms, namely anatase, rutile and brookite. Among them, anatase has a higher photocatalytic activity due to the strong redox ability of photogenerated charge carriers and the easy adsorption of oxygen on the surface to enhance the life of photogenerated charge...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G23/053B82Y40/00
Inventor 王靖宇谷留安韩喜江
Owner HARBIN INST OF TECH
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