Preparation method of neutral anatase type nano titanium dioxide sol

A nano-titanium dioxide, anatase-type technology, applied in sol preparation, titanium dioxide, chemical instruments and methods, etc., can solve the problems of high environmental requirements, unfavorable large-scale production, high price of titanium alkoxide, and improve photocatalytic performance. , good environmental friendliness, uniform effect of nanoparticles

Pending Publication Date: 2021-05-04
SHANGHAI INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Since the currently prepared nano-titanium dioxide is easy to agglomerate, and the absorption spectrum of nano-titanium dioxide is limited, it is difficult to have an efficient application of nano-titanium dioxide prepared by the general method without modification.
Moreover, the price of titanium alkoxide is high, it is easy to hydrolyze, and the environmental requirements for large-scale production equipment are high, so it is not conducive to large-scale production. The added lye is hydrolyzed and condensed, and other elements will be introduced

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  • Preparation method of neutral anatase type nano titanium dioxide sol

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Embodiment 1

[0030] A preparation method of neutral anatase nano-titanium dioxide sol, comprising the following steps:

[0031] (1) Pour a certain amount of deionized water into the beaker, control the reaction temperature at about 0°C, and carry out magnetic stirring. Put a stirring magnet in the beaker and add 100ml of water, insert the thermometer into the magnetic stirring pot, Control the temperature at around 0°C; when the water temperature in the beaker is around 0°C, take 11ml of titanium tetrachloride and slowly add it to the beaker, there will be a lot of heat release during the process, control the hydrolysis temperature at around 2°C, after the hydrolysis is completed, it will be strongly acidic and transparent Solution: After the hydrolysis is completed, add 33ml of ammonia water with a concentration of 25-28ωt% to neutralize and stir continuously, and flocculent precipitates appear, until the pH becomes neutral, and age for 30 minutes.

[0032] (2) Cryogenic centrifuge to rem...

Embodiment 2

[0036] A preparation method of neutral anatase nano-titanium dioxide sol, comprising the following steps:

[0037] (1) Pour a certain amount of deionized water into the beaker, control the reaction temperature at about 0°C, and carry out magnetic stirring. Put a stirring magnet in the beaker and add 100ml of water, insert the thermometer into the magnetic stirring pot, Control the temperature at around 0°C; when the water temperature in the beaker is around 0°C, take 11ml of titanium tetrachloride and slowly add it to the beaker, there will be a lot of heat release during the process, control the hydrolysis temperature at around 2°C, after the hydrolysis is completed, it will be strongly acidic and transparent Solution: After the hydrolysis is completed, add 44ml of ammonia water with a concentration of 25-28ωt% to neutralize and stir continuously, and flocculent precipitation appears, until the pH becomes neutral, and age for 30 minutes.

[0038] (2) Cryogenic centrifuge to r...

Embodiment 3

[0042] A preparation method of neutral anatase nano-titanium dioxide sol, comprising the following steps:

[0043] (1) Pour a certain amount of deionized water into the beaker, control the reaction temperature at about 0°C, and carry out magnetic stirring. Put a stirring magnet in the beaker and add 100ml of water, insert the thermometer into the magnetic stirring pot, Control the temperature at around 0°C; when the water temperature in the beaker is around 0°C, take 11ml of titanium tetrachloride and slowly add it to the beaker, there will be a lot of heat release during the process, control the hydrolysis temperature at around 2°C, after the hydrolysis is completed, it will be strongly acidic and transparent Solution: After the hydrolysis is completed, add 33ml of ammonia water with a concentration of 25-28ωt% to neutralize and stir continuously, and flocculent precipitates appear, until the pH becomes neutral, and age for 30 minutes.

[0044] (2) Cryogenic centrifuge to rem...

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Abstract

The invention relates to a preparation method of neutral anatase type nano titanium dioxide sol. The method comprises the following steps: taking TiCl4 as a titanium source, reacting with an alkaline solution to generate flocculent precipitate Ti(OH)4, adjusting the pH value to 7-8, centrifugally washing the flocculent precipitate to remove chloride ions, adding H2O2 to modify and oxidize to generate a yellow complex, heating to react and magnetically stirring to obtain the stable neutral anatase type nano titanium dioxide sol. Compared with the prior art, the preparation method has the advantages that titanium tetrachloride is used as the titanium source, so that the prepared nano titanium dioxide sol has good dispersity, and the crystal form of nano titanium dioxide is anatase type.

Description

technical field [0001] The invention relates to the field of nanomaterial preparation, in particular to a preparation method of neutral anatase nano-titanium dioxide sol. Background technique [0002] Nano-titanium dioxide generally exists in nature in the form of white solid or powder. In real life, nano-carbon dioxide is often used in cosmetics, anti-ultraviolet agents, self-cleaning products, photocatalysts, antibacterial materials, etc. According to the crystal form of nano titanium dioxide, it can be divided into three crystal forms, which are anatase type, rutile type and brookite type. Among them, the anatase structure is highly symmetrical and has high photocatalytic performance. [0003] At present, the synthesis and production methods of nano-titanium dioxide are mainly divided into physical method and chemical method. Because the physical method consumes a lot of energy and requires high process control and equipment, chemical methods are often used to prepare n...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G23/053B82Y40/00B01J13/00
CPCC01G23/0536B82Y40/00B01J13/0047C01P2004/64C01P2006/90
Inventor 郑义杨旭琨
Owner SHANGHAI INST OF TECH
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