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Preparation method for synthesizing nucleocapsid TiO2/Al2O3 nano powder by one-step hydrothermal process

A technology of nano-powder and hydrothermal method, which is applied in the field of preparation of core-shell TiO2/Al2O3 nano-powder by one-step hydrothermal method, which can solve the problems of high manufacturing cost, complicated process, long production cycle, etc., and achieve reduction The effect of production time, shortened process flow, and light degree of agglomeration

Inactive Publication Date: 2006-10-25
GUANGDONG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The traditional preparation process of core-shell nano-powder materials basically adopts the process route of preparing nano-core particles first and then coating them, and all have to undergo crystallization heat treatment in the later stage, so the process flow is complicated and the production cycle is long. Manufacturing costs are high, and industrialization has certain limitations

Method used

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  • Preparation method for synthesizing nucleocapsid TiO2/Al2O3 nano powder by one-step hydrothermal process

Examples

Experimental program
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Effect test

Embodiment 1

[0021] Weigh 9 grams of titanium tetrachloride, add deionized water to make a 0.2M solution, add 15% ammonia water dropwise at a rate of 1-2 drops / second at a stirring speed of 150r / min, and control the pH value to 8.5 Ti in solution 4+ The precipitation is complete, and Ti(OH) is obtained 4 Precipitate and age for 0.5h; weigh 6 grams of AlCl 3 .6H 2 O into the beaker, add deionized water to make a solution with a certain concentration, and then add it dropwise to the uniformly dispersed Ti(OH) at a rate of 1-2 drops / second 4 In the cloudy solution, continue to stir, and at the same time, drop 15% ammonia water into the cloudy solution at a rate of 2-3 drops / second, adjust the pH value to 8.8, and after aging for a certain period of time, filter it with deionization Washed several times with water until AgNO 3 Test the filtrate until no precipitation occurs, and the precipitate obtained by suction filtration at this time is core-shell type Ti(OH) 4 / Al(OH) 3 Precursor. ...

Embodiment 2

[0023] Weigh 12 grams of titanium tetrachloride, add deionized water to make a 0.25M solution, add 15% ammonia water dropwise at a rate of 1-2 drops / second at a stirring speed of 150r / min, and control the pH value to 8.8 Ti in solution 4+ The precipitation is complete, and Ti(OH) is obtained 4 Precipitate and age for 0.5h; weigh 7.5g of AlCl 3 .6H 2 O into the beaker, add deionized water to make a solution with a certain concentration, and then add it dropwise to the uniformly dispersed Ti(OH) at a rate of 1-2 drops / second 4 In the cloudy solution, continue to stir, and at the same time, drop 15% ammonia water into the cloudy solution at a rate of 2-3 drops / second, adjust the pH value to 9.2, and after aging for a certain period of time, filter it with deionization washed several times with water until AgNO 3 Test the filtrate until no precipitation occurs, and the precipitate obtained by suction filtration at this time is core-shell type Ti(OH) 4 / Al(OH) 3 Precursor. A...

Embodiment 3

[0025] Weigh 6 grams of titanium tetrachloride, add deionized water to make a 0.3M solution, add 15% ammonia water dropwise at a rate of 1-2 drops / second at a stirring speed of 150r / min, and control the pH value to 9.0 Ti in solution 4+ The precipitation is complete, and Ti(OH) is obtained 4 Precipitate and age for 0.5h; weigh 5.1g of AlCl 3 .6H 2 O into the beaker, add deionized water to make a solution with a certain concentration, and then add it dropwise to the uniformly dispersed Ti(OH) at a rate of 1-2 drops / second 4 In the cloudy solution, continue to stir, and at the same time, drop 15% ammonia water into the cloudy solution at a rate of 2-3 drops / second, adjust the pH value to 9.5, and after aging for a certain period of time, filter it with deionization washed several times with water until AgNO 3 Test the filtrate until no precipitation occurs, and the precipitate obtained by suction filtration at this time is core-shell type Ti(OH) 4 / Al(OH) 3 Precursor. Add...

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Abstract

This invention discloses one step hydrothermal method synthesizing nucleocapsid style TiO2 / Al2O3 nm powder body preparation method. It includes following procedures first ammonia water is added into material TiC14 solution to control pH value between 8.5 and 9.0 to fully deposit Ti4+ in the solution to make predecessor Ti(OH)4 of Ti02, then AlCl3 solution is added to Ti(OH)4, and ammonia water is added to Ti(OH)4 at the same time, pH value is adjusted to 8.8-9.5, then Al(OH)3 envelope is formed on surface of Ti(OH)4 to get predecessor. The predecessor is filled into high pressure tank as Ti(OH)4 / Al(OH)3 style to take part in hydrothermal reaction, then it is filtrated after the reaction, and then it is alcohol water exchanged by absolute ethyl alcohol, finally TiO2 / Al2O3 nm powder body is got after dried. There is no need to prepare nm level Ti02 core, and then enveloping in this method. Because water heat method is used in this invention, complex powder particles are uniform, envelope is integrated, agglomeration is few, and its preparation cost is reduced, technological line is facilitated, so it has wide industrial application prospect.

Description

technical field [0001] The invention relates to a preparation method of nano-scale core-shell type composite powder, in particular to a one-step hydrothermal method for synthesizing core-shell type TiO 2 / Al 2 o 3 Preparation method of nanopowder. Background technique [0002] Nano-titanium dioxide is a functional fine inorganic material with high added value. Because of its good weather resistance, chemical corrosion resistance, strong UV resistance, and excellent transparency, it is widely used in automotive topcoats, photosensitive materials, photocatalysts, cosmetics, food packaging materials, ceramic additives, gas sensors and electronic materials, etc. However, due to the nano-TiO 2 The large specific surface area and many surface empty bonds are prone to agglomeration during the preparation and application process, so that its excellent performance cannot be fully exerted. Nano-TiO 2 After the core-shell modification, the powder can become a new functional mate...

Claims

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Application Information

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IPC IPC(8): C04B35/626C04B35/10C04B35/46
Inventor 邓淑华黄慧民周立清刘志平欧得华
Owner GUANGDONG UNIV OF TECH
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