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Titanium dioxide/silicon dioxide nanometer composite material and preparation method and application thereof

A nano-composite material, silicon dioxide technology, applied in the application of titanium dioxide/silicon dioxide nano-composite material in photocatalytic degradation of organic dyes, titanium dioxide/silicon dioxide nano-composite material and its preparation field, can solve high cost, The actual utilization rate of titanium dioxide is low

Inactive Publication Date: 2015-01-07
ANHUI UNIVERSITY OF TECHNOLOGY AND SCIENCE
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] When pure nano-titanium dioxide is used as a photocatalyst, electrochemical catalyst, organic synthesis catalyst or additive for fine chemical products, the raw materials of titanium dioxide have high costs, and the actual utilization rate of titanium dioxide is low

Method used

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  • Titanium dioxide/silicon dioxide nanometer composite material and preparation method and application thereof
  • Titanium dioxide/silicon dioxide nanometer composite material and preparation method and application thereof
  • Titanium dioxide/silicon dioxide nanometer composite material and preparation method and application thereof

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preparation example Construction

[0022] The invention provides a preparation method of titanium dioxide / silicon dioxide nanocomposite material, the preparation method comprising:

[0023] A, the process of preparing nano-silica sol by sol method;

[0024] b, in the presence of a solvent, mixing the nano-silica sol, cetyltrimethylammonium bromide, and tetrabutyl titanate and carrying out a contact reaction to obtain a pale yellow precipitate;

[0025] c. The process of mixing the pale yellow precipitate, hydrochloric acid and acetone and refluxing to prepare a titanium dioxide / silicon dioxide nanocomposite material.

[0026] In step b, the amount of each substance can be selected in a wide range. In order to improve the yield of the light yellow precipitate and control the thickness of the coating layer on the outer surface of the titanium dioxide shell, preferably, relative to 100 parts by weight of the Nano silica sol, the consumption of described hexadecyltrimethylammonium bromide is 5-15 parts by weight, ...

Embodiment 1

[0044] 1) Preparation of white silicic acid sol: at 30°C, mix 28g of ethanol, 0.6g of ammonia water, 4.5g of water, and 1g of ethyl orthosilicate for 8 hours to obtain a white silicic acid sol, then centrifuge the white silicic acid sol, and use Distilled water, ethanol and distilled water washing;

[0045] 2) Preparation of light yellow sol: mix 1g of white silicic acid, 18g of ethanol, 0.1g of cetyltrimethylammonium bromide, 0.04g of resorcinol, 0.14g of formaldehyde and 0.15g of ammonia water and mix them at 55°C After reacting for 2 hours, a light yellow sol was obtained, which was collected by centrifugation and washed with distilled water, absolute ethanol and distilled water in sequence. The light yellow sol was subjected to SEM detection, and the results were as follows figure 1 and figure 2 As shown in the figure, it can be seen that the nano-silica is spherical and the average particle size is 250nm.

[0046] 3) Preparation of light yellow precipitate: at 30°C, m...

Embodiment 2

[0051] 1) Preparation of white silicic acid sol: At 45°C, mix 30g of ethanol, 0.7g of ammonia water, 5g of water, and 1g of ethyl orthosilicate for 12 hours to obtain a white silicic acid sol, then centrifuge the white silicic acid sol, and successively wash with distilled water , ethanol and distilled water washing;

[0052] 2) Preparation of light yellow sol: mix 1g of white silicic acid, 30g of ethanol, 0.15g of cetyltrimethylammonium bromide, 0.06g of resorcinol, 0.18g of formaldehyde and 0.2g of ammonia water and mix them at 60°C After reacting for 3 hours, a light yellow sol was obtained, which was collected by centrifugation and washed with distilled water, absolute ethanol and distilled water in sequence.

[0053] 3) Preparation of light yellow precipitate: at 35°C, mix 1 g of light yellow sol, 0.15 g of cetyltrimethylammonium bromide, 30 g of ethanol and 0.1 g of water, then add 0.3 g of tetrabutyl titanate to react 12h, a pale yellow precipitate was obtained. The l...

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Abstract

The invention discloses a titanium dioxide / silicon dioxide nanometer composite material and a preparation method and application thereof. The preparation method comprises the following steps: a, preparing nanometer silica sol by adopting a sol method; b, mixing the nanometer silica sol, hexadecyl trimethyl ammonium bromide and tetrabutyl titanate in the presence of solvents, carrying out contact reaction, so as to prepare a faint yellow precipitate; c, mixing and refluxing the faint yellow precipitate, hydrochloric acid and acetone, so as to prepare white powder; and d, heating the white powder to the temperature of 350-650 DEG C at a temperature rise rate of 1-10 DEG C per minute, carrying out heat treatment for 0.5-24 hours, so as to prepare the titanium dioxide / silicon dioxide nanometer composite material. The nanometer composite material has the functions of nanometer titania, the production cost can be reduced, and the utilization rate is increased, so that the nanometer composite material can be widely applied to photocatalytic degradation organic dyestuffs. Meanwhile, the preparation method is simple in process, and raw materials are readily available.

Description

technical field [0001] The invention relates to nanocomposite materials, in particular to a titanium dioxide / silicon dioxide nanocomposite material, a preparation method thereof and an application of the titanium dioxide / silicon dioxide nanocomposite material in photocatalytic degradation of organic dyes. Background technique [0002] As a heterogeneous catalyst, titanium dioxide crystals are widely used in photo-splitting water, degrading organic impurities in water, and antibacterial aspects. When titanium dioxide is irradiated by sunlight or ultraviolet rays from fluorescent lamps, the electrons inside it are 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 are active oxygen, which have a strong oxidative decomposition ability, so t...

Claims

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Application Information

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IPC IPC(8): B01J21/08C02F1/32
Inventor 陶玉贵万勇沈亚东范李龙
Owner ANHUI UNIVERSITY OF TECHNOLOGY AND SCIENCE
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