Modified titanium dioxide nano-sol and preparation method thereof

A technology of titanium dioxide and nano-sol, which is applied in chemical instruments and methods, colloid chemistry, colloid chemistry, etc., can solve the problems of unsuitable storage and deterioration of titanium dioxide sol, and achieve good chemical and thermal stability, uniform particle size, electrochemical good performance

Inactive Publication Date: 2012-06-20
CHONGQING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] Titanium dioxide has high photocatalytic activity. It is an n-type semiconductor with a band gap of only 3.2eV. The band is excited to the conduction band, and at the same time, corresponding holes are generated in the valence band, that is, electron-hole pairs are generated; this electron-hole pair has high catalytic activity and can stimulate a series of complex chemical reactions. Coated in TiO 2 Organic matter such as oleic acid on the surface undergoes degradation reactions, resulting in deterioration of the sol. Therefore, the titanium dioxide sol prepared by the existing hydrothermal method is not suitable for storage under sunlight

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  • Modified titanium dioxide nano-sol and preparation method thereof

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preparation example Construction

[0029] The present invention also provides a preparation method of modified titanium dioxide nano-nano-sol, comprising:

[0030] Provide titanium dioxide nano sol;

[0031] Using chloroauric acid as raw material, mercaptan as surfactant, and tetraoctyl ammonium bromide as phase transfer agent, a reduction reaction occurs under the action of mercaptocarboxylic acid and sodium borohydride to obtain a modified gold nano-sol;

[0032] The modified gold nano sol and the titanium dioxide nano sol are respectively dispersed in an organic solvent, and then mixed to obtain a titanium dioxide sol modified with the modified gold nano sol.

[0033] According to the present invention, titanium dioxide nano sol is firstly provided. Since titanium dioxide nanoparticles are divided into anatase type and rutile type, it is necessary to pay attention to different parameter settings during purchase and preparation.

[0034] The present invention preferably prepares titanium dioxide nano-sol by ...

Embodiment 1

[0046] Disperse 0.15g of TTIP and 5mL of oleic acid in toluene, dissolve 0.1mL of tert-butylamine in water, mix the toluene solution of TTIP and oleic acid with the aqueous solution of tert-butylamine in a 50mL reaction kettle, and heat to 180°C for 4 hours to obtain Titanium dioxide nano-sol with an average particle size of 4nm.

[0047] Take 0.09mmol chloroauric acid, 0.9mmol sodium borohydride, 0.18mmol TOAB, 0.09mmol DDT, and dissolve chloroauric acid in water, and then add TOAB, DDT, sodium borohydride aqueous solution, and gold chloride successively under the condition of vigorous stirring at room temperature. The acid was reduced to gold nanoparticles with an average particle size of 2 nm.

[0048] Take 0.5mL of gold nano-sol and 0.5mL of titanium dioxide nano-sol, add it to 4mL of toluene solution, mix evenly, let it stand for more than 3 months, no precipitation is found.

[0049] figure 1 The transmission electron microscope image of the modified titanium dioxide n...

Embodiment 2

[0051] Disperse 0.15g of TTIP and 10mL of oleic acid in toluene, dissolve 0.4mL of tert-butylamine in water, mix the toluene solution of TTIP and oleic acid with the aqueous solution of tert-butylamine in a 50mL reaction kettle, and heat to 180°C for 4 hours to obtain Titanium dioxide nano-sol with an average particle size of 6nm.

[0052] Take 0.09mmol chloroauric acid, 0.9mmol sodium borohydride, 0.18mmol TOAB, 0.09mmol DDT, and dissolve chloroauric acid in water, and then add TOAB, DDT, sodium borohydride aqueous solution, and gold chloride successively under the condition of vigorous stirring at room temperature. The acid was reduced to gold nanoparticles with an average particle size of 2 nm.

[0053] Take 0.5mL of gold nano-sol and 0.5mL of titanium dioxide nano-sol, add it to 4mL of toluene solution, mix evenly, let it stand for more than 3 months, no precipitation is found.

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Abstract

The invention provides a preparation method of modified titanium dioxide nano-sol comprising the following steps: providing titanium dioxide nano-sol, reducing chloroauric acid by taking the chloroauric acid as the raw material, the dodecanethiol as the surfactant, the tetraoctylammonium bromide as the phase transfer agent and the boron-hydrogen compound as the reductant under the action of the thiol carboxylic acid and the dodecanethiol to obtain modified gold nano-sol, dispersing the gold nano-sol and the titanium dioxide nano-sol in an organic solvent respectively, and mixing to obtain the titanium dioxide nano-sol modified by the modified gold nano-sol. The preparation method provided by the invention can be used for preparing the modified titanium dioxide nano-sol which has a uniform particle size, good dispersibility and good chemical and thermal stability. The invention further provides the modified titanium dioxide nano-sol.

Description

technical field [0001] The invention relates to the field of preparation of inorganic composite materials, in particular to a modified titanium dioxide nanometer and a preparation method thereof. Background technique [0002] Titanium dioxide nano-sol and gold nano-particles have good multi-sensitivity and are used in chemical industry, medicine, machinery, catalysis, molecular biology, biosensor and other fields. With the development of science and technology, titanium dioxide nano-sol and gold nano-sol will be applied to more fields. Titanium dioxide nano-sol can be used in sewage treatment, air purification treatment, product surface antibacterial treatment, glass coating treatment and other fields. [0003] The preparation method of titanium dioxide nano-sol in the prior art is: tetrapropyl titanate (titanium (iv) n-propoxide abbreviation TTIP) is dispersed in the oily phase that toluene or hexanaphthene form, tert-butylamine (tert-butylamine) disperses In water, put t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J13/00
Inventor 张育新
Owner CHONGQING UNIV
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