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Method for synthesizing anatase phase titanium dioxide nanometer particle by microreactor

A technology of hydrated titanium dioxide and titanium dioxide, which is applied in the direction of titanium dioxide, titanium oxide/hydroxide, etc., can solve the problem that the high density of the film affects the photocatalytic performance, and achieve the effect of strong redox ability, good stability and short reaction time

Inactive Publication Date: 2009-12-09
DONGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Since the dry film of titanic acid peroxide solution or sol is an amorphous titanium peroxide hydrate, it can form a tightly bonded film on various materials at room temperature, but the high density of the film will affect its photocatalytic performance.

Method used

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  • Method for synthesizing anatase phase titanium dioxide nanometer particle by microreactor
  • Method for synthesizing anatase phase titanium dioxide nanometer particle by microreactor
  • Method for synthesizing anatase phase titanium dioxide nanometer particle by microreactor

Examples

Experimental program
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Effect test

Embodiment 1

[0034] Add 0.5M sodium hydroxide solution dropwise to 0.5M titanium tetrachloride solution at room temperature, and neutralize to pH approximately equal to 7 to obtain a white precipitate. Wash it repeatedly with distilled water to obtain a gel-like solid. Take 30 grams of wet precipitate ( It is converted to 4 grams of titanium dioxide.) Disperse it in 180 ml of hydrogen peroxide (30wt%) and degelatinize at 30°C for 6 hours to obtain an orange transparent peroxytitanic acid aqueous solution or sol. The content of titanium dioxide in the solution is 0.24M , The pH value is about 6. Dilute the peroxy titanic acid aqueous solution or sol with ethylene glycol at 2:58, measure 10 mL into the syringe, and seal with silicone grease to prevent leakage. Push the reaction solution into the capillary with a micro-propelling pump, and complete the nucleation and growth stage in a constant temperature oil bath at 180°C for 40 seconds. After the reaction, the product is received in a sample bo...

Embodiment 2

[0037] Add 2M ammonia water dropwise to the 1M titanium oxysulfate solution at 70℃, keep hydrolyzing for 6 hours, neutralize to a weak alkaline pH value of about 8 to obtain a white precipitate, repeatedly wash with distilled water to obtain a gel-like solid, take the wet precipitation Disperse 15 grams (2 grams into titanium dioxide) in about 90 milliliters of hydrogen peroxide (35wt%) and dissolve the gel at room temperature for 2 hours to obtain an orange-yellow transparent peroxytitanic acid hydrosol with a pH of about 6 . After diluting the peroxytitanic acid aqueous solution or sol and deionized water at a mass ratio of 1:5, take a portion and dilute it with ethylene glycol at a ratio of 1:9, measure 10 mL into the syringe, and seal with silicone grease to prevent leakage. Push the reaction solution into the capillary with a micro-propelling pump, and complete the nucleation and growth stage in a constant temperature oil bath at 180°C for 120 seconds. After the reaction, the...

Embodiment 3

[0039] After heating the 0.5mol / L titanium sulfate solution to 50°C, add 1.5mol / L ammonia solution dropwise to the solution, heat and hydrolyze for 10 hours, and neutralize to a pH of about 7, to obtain a white precipitate, which is repeatedly washed with distilled water to obtain Gel-like solid, take 40 g of wet precipitate (6.2 g converted to titanium dioxide), disperse it in 280 ml of hydrogen peroxide (35wt%) solution, and debond for 12 hours to obtain orange-yellow transparent peroxytitanic acid hydrosol, pH The value is approximately 6. Dilute the peroxy titanic acid aqueous solution or sol with ethylene glycol at a ratio of 1:59, measure 10 mL into the syringe, and seal with silicone grease to prevent leakage. Push the reaction solution into the capillary with a micro-propelling pump, and complete the nucleation and growth stage in a constant temperature oil bath at 180°C for 80 seconds. After the reaction, the product is received in a sample bottle to obtain an EG dispersi...

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Abstract

The invention relates to a method for synthesizing anatase phase titanium dioxide nanometer particle by a microreactor, comprising the following steps: (1) titaniferous inorganic substance is confected into water solution, and is heated, and inorganic alkali solution is added; (2) after precipitate is washed with water, the clean precipitate is put into perhydrol liquid, is stirred and is scattered with ultrasound, the temperature is preserved for 12-24h after rising, and peptization is carried out to obtain potassium peroxytitanate solution or collosol; (3) after diluted with polyalcohol, the potassium peroxytitanate solution or the collosol is injected into the microreactor to be treated with oil bath to obtain titanium dioxide collosol; (4) the collosol is mixed with acetone, titanium dioxide colloid particles are performed with precipitation and decentralization to obtain light white titanium dioxide powder bodies. The invention has simple technology and short reaction time and is suitable for industrialized production; the obtained titanium dioxide collosol has the characteristics of small particle, even distribution, favourable crystallinity, favourable stability, high transparency and the like.

Description

Technical field [0001] The invention belongs to the field of preparation of titanium dioxide nanoparticles, and particularly relates to a method for synthesizing anatase phase titanium dioxide nanoparticles in a microreactor. Background technique [0002] Nano TiO 2 Non-toxic and odorless, it is widely used in technical fields such as photocatalysis, dye-sensitized solar cells, antibacterial coatings, photosensitive materials, cosmetics, chemical fibers, infrared reflective films, stealth coatings, etc. Titanium dioxide is a broadband semiconductor material. The band gap of titanium oxide crystal calculated by the band structure model is 3.0eV (rutile phase) and 3.2eV (anatase phase). Band gap of semiconductor E g The larger is, the higher the potential of the oxidation-reduction electrode corresponding to the generated photo-generated electrons and holes is, and the prepared TiO 2 The more active it is, the easier it is to react with other substances. Nano-titanium dioxide produ...

Claims

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Application Information

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IPC IPC(8): C01G23/053
Inventor 张青红张利王宏志李耀刚
Owner DONGHUA UNIV
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