Method for preparing nano silicon dioxide coated by nano titanium dioxide

A technology of nano-silica and nano-titanium dioxide, applied in chemical instruments and methods, fibrous fillers, inorganic pigment treatment, etc., to achieve good social and economic benefits, uniform particle size distribution, and simple equipment

Inactive Publication Date: 2009-12-30
STATE GRID CORP OF CHINA +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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No technical disclosure or use of nano-titanium dioxide-coated nano-

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  • Method for preparing nano silicon dioxide coated by nano titanium dioxide
  • Method for preparing nano silicon dioxide coated by nano titanium dioxide

Examples

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Embodiment 1

[0025] A preparation method of nano-titanium dioxide-coated nano-silicon dioxide composite material, the steps are:

[0026] In the first step, under the conditions of stirring and ultrasonic waves, add 0.1 mol / L hydrochloric acid dropwise to the sodium silicate solution with a concentration of 0.1 mol / L, control the pH value of the reaction system to 5.5, and the reaction temperature to 25°C. React for 30 minutes and let stand for 0.5 hours to obtain white or transparent silicic acid sol; dry the white or transparent silicic acid sol at 65°C for 2 hours to obtain white silicic acid gel; Mix the gel with distilled water whose volume is 1 times the volume of the silicic acid gel, ball mill for 10 minutes, wash the ball-milled silicic acid gel with distilled water until the eluate is neutral or chlorine ions are detected, filter under reduced pressure (less than 100Kpa), A white silicic acid gel solid is obtained; thermally decompose the white silicic acid gel solid at 150°C to ...

Embodiment 2

[0031] A preparation method of nano-titanium dioxide-coated nano-silicon dioxide composite material, the steps are:

[0032] In the first step, under the conditions of stirring and ultrasonic waves, add dropwise a mixed solution of hydrochloric acid and sulfuric acid with a total concentration of 2mol / L to the sodium silicate solution with a concentration of 2mol / L to control the pH of the reaction system The value is 9.5, the reaction temperature is 25°C, react for 30 minutes, and stand for 1 hour to obtain white or transparent silicic acid sol; dry the white or transparent silicic acid sol at 100°C for 12 hours to obtain white silica acid gel; mix the white silicic acid gel with distilled water twice the volume of the silicic acid gel, ball mill for 10 minutes, and wash the ball-milled silicic acid gel with distilled water until the eluate is neutral or free of chloride ions. out, vacuum filtration (less than 100Kpa) or centrifugation to obtain a white silicic acid gel, whic...

Embodiment 3

[0037] A preparation method of nano-titanium dioxide-coated nano-silicon dioxide composite material, the steps are:

[0038] In the first step, under the conditions of stirring and ultrasonic waves, add 1 mol / L nitric acid dropwise to the potassium silicate solution with a concentration of 1 mol / L, control the pH value of the reaction system to 6.5, and the reaction temperature to 35°C. Minutes, let it stand for 1 hour to get white or transparent silicic acid sol; dry the white or transparent silicic acid sol at 80°C for 2 to 24 hours to get white silicic acid gel; white silicic acid gel Mix the gel with distilled water three times the volume of the silicic acid gel, ball mill for 20 minutes, wash the ball-milled silicic acid gel with distilled water until the eluate is neutral, filter under reduced pressure (less than 100Kpa) or centrifuge to obtain a white Silicic acid gel, thermally decompose white silicic acid gel at 250°C to obtain white nano-silica powder;

[0039] The ...

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Abstract

The invention discloses a method for preparing nano silicon dioxide coated by nano titanium dioxide, which is implemented by firstly dripping inorganic acid in silicate solution under the conditions of stirring and ultrasonic, controlling pH, reaction temperature and time of a reaction system to obtain white silicic acid collosol, drying to obtain silicic acid gel, then mixing the silicic acid gel with water followed by bal milling, rinsing and filtering to obtain gel, hot decomposing the silicic acid gel to obtain silicon dioxide powder; secondly, mixing the silicon dioxide powder with a mixed solution of glacial acetic acid, water and absolute alcohol under the conditions of stirring and ultrasonic; and thirdly, adding mixed solution of Tetrabutyl orthotita and absolute alcohol to the mixture, standing, drying and ball milling the mixture to obtain silicon dioxide powder coated by titanic acid gel, then heating for decomposition to obtain composite material powder. The grain diameter of the composite material of silicon dioxide coated by nano titanium dioxide is 1-100nm and the purity thereof is over 99.8%.

Description

technical field [0001] The invention relates to the fields of photochemical catalyst, electrochemical catalyst, organic synthesis, fine product chemical industry, etc., and more specifically relates to a preparation method of nano-titanium dioxide-coated nano-silicon dioxide. The nano-titanium dioxide-coated nano-silica composite material prepared by the invention can be used as a photocatalyst for water treatment, an electrochemical catalyst, a catalyst for organic synthesis, an additive for fine chemical products, and the like. Background technique [0002] When nano-titanium dioxide is irradiated by sunlight or ultraviolet rays from fluorescent lamps, the internal electrons will be excited. As a result, negatively charged electrons and positively charged holes are generated. The electrons reduce the oxygen in the air or water to generate hydrogen peroxide, and the holes act in the direction of oxidizing the surface water molecules to generate hydroxyl radicals. These ar...

Claims

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Application Information

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IPC IPC(8): C09C1/36C09C1/28C09C3/06
Inventor 周阳叶海燕李帆林丽程凡周环波
Owner STATE GRID CORP OF CHINA
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