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Preparation method of nano-titanium dioxide coated nano-aluminium oxide

A nano-titanium dioxide and aluminum oxide technology is applied in chemical instruments and methods, inorganic pigment processing, fibrous fillers, etc., to achieve the effects of simple equipment, flexible process and low comprehensive production cost

Inactive Publication Date: 2010-01-06
STATE GRID CORP OF CHINA +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the existing technology, there is no technical publication or use of the preparation method of nano-titanium dioxide-coated nano-alumina composite material

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] A preparation method of nano-titanium dioxide-coated nano-alumina composite material, the steps are as follows:

[0024]In the first step, under the conditions of stirring and ultrasonic action, add dropwise a sodium hydroxide solution with a concentration of 0.1 mol / L to the aluminum chloride solution with a concentration of 0.1 mol / L, and control the pH value of the reaction system to about 8.5. 10 minutes, stand still for 0.5 hours to obtain aluminum hydroxide sol, dry at 60°C for 24 hours to obtain aluminum hydroxide gel; mix aluminum hydroxide gel with distilled water whose volume is 1 times the volume of aluminum hydroxide gel, and ball mill For 5 minutes, wash the ball-milled aluminum hydroxide gel with distilled water until the eluate is neutral or no chloride ion is detected, filter under reduced pressure (less than 100Kpa) or centrifuge, and wash the aluminum hydroxide gel at 150 Thermally decompose at ℃ to obtain nano-alumina powder;

[0025] The second step...

Embodiment 2

[0028] A preparation method of nano-titanium dioxide-coated nano-alumina composite material, the steps are as follows:

[0029] In the first step, under the condition of stirring and ultrasonic action, add 4 mol / L potassium hydroxide solution dropwise to the aluminum nitrate solution with a concentration of 4 mol / L, control the pH value of the reaction system to about 9.5, react for 20 minutes, and statically Set aside for 3 hours to obtain aluminum hydroxide sol, dry at 80°C for 6 hours to obtain aluminum hydroxide gel; mix aluminum hydroxide gel with distilled water whose volume is 3 times the volume of aluminum hydroxide gel, and ball mill for 30 minutes 1. Wash the ball-milled aluminum hydroxide gel with distilled water until the eluate is neutral, filter under reduced pressure (less than 100Kpa) or centrifuge, and thermally decompose the cleaned aluminum hydroxide gel at 450°C to obtain nano Aluminum oxide powder;

[0030] The second step is to add 30g of the above-menti...

Embodiment 3

[0033] A preparation method of nano-titanium dioxide-coated nano-alumina composite material, the steps are as follows:

[0034] In the first step, under the conditions of stirring and ultrasonic waves, add dropwise the equimolar mixed solution of aluminum chloride and aluminum sulfate with a total concentration of 6 mol / L to the mixed solution of aluminum chloride and aluminum sulfate with a total concentration of 6 mol / L. A mixed solution of sodium and potassium hydroxide, controlling the pH value of the reaction system to about 10.5, reacting for 50 minutes, standing for 12 hours to obtain aluminum hydroxide sol, drying at 80°C for 20 hours to obtain aluminum hydroxide gel; Aluminum hydroxide gel is mixed with distilled water whose volume is 1.5 times the volume of aluminum hydroxide gel, ball milled for 45 minutes, and the aluminum hydroxide gel after ball milling is washed with distilled water until the eluate is neutral or free of chloride ions or sulfate ions , Filtratio...

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Abstract

The invention discloses a preparation method of nano-titanium dioxide coated nano-aluminium oxide, which comprises the following steps: firstly, dropwise adding an alkaline solution in an aluminium salt solution under the conditions of stirring and ultrasonication, controlling the pH value of a system, and still standing to acquire aluminum hydroxide sol; drying the aluminum hydroxide sol, mixing the aluminum hydroxide sol and water, ball milling, washing the mixture with water until eluate is neutral, filtering by decompression or centrifugalizing, and thermally decomposing to acquire nano-aluminium oxide powder; secondly, adding the nano-aluminium oxide powder into a mixed solution of glacial acetic acid, water and absolute alcohol to acquire the mixture under the conditions of ultrasonication and stirring; adding the mixed solution of butyl titanate and absolute alcohol into the mixture under the conditions of ultrasonication and stirring, still standing, drying and ball milling to acquire the powder; and placing the powder into a furnace at constant temperature, and thermally decomposing to acquire the nano-titanium dioxide coated nano-aluminium oxide powder. The grain diameter of nano-titanium dioxide coated nano-aluminium oxide composite material grains is 1-50 nm, and the purity is higher than 99.8 percent.

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 nanometer titanium dioxide-coated nanometer aluminum oxide. The nano-titanium dioxide-coated nano-alumina 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] Due to its small particle size and large specific surface area, nano-titanium dioxide has special effects that conventional materials do not have, such as quantum effects, tunnel effects, unique color effects, and functions such as photocatalysis and ultraviolet shielding. It is used in functional coatings, automobiles, Cosmetics, health care, wastewater treatment, environmental protection, etc. have shown broad application pros...

Claims

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Application Information

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IPC IPC(8): C09C1/40C09C1/36C09C3/06
Inventor 叶海燕李帆周阳林丽程凡周环波
Owner STATE GRID CORP OF CHINA
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