Titanium dioxide/silicon dioxide photocatalyst and preparation method thereof

A technology of silicon dioxide and titanium dioxide, applied in physical/chemical process catalysts, chemical instruments and methods, chemical/physical processes, etc., can solve problems such as unfavorable photocatalytic activity and improvement, and achieve good photocatalytic activity and mild preparation conditions. , the effect of high purity of anatase phase

Inactive Publication Date: 2019-03-22
HUAIHUA UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The titanium dioxide gel prepared by the traditional sol-gel method needs to be combined with high-temperature calcination to achieve better photocatalytic activity after drying, but the prepared nanoparticles have a large particle size and usually contain a certain amount of rutile phase, which is not conducive to photocatalysis. Increased activity

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  • Titanium dioxide/silicon dioxide photocatalyst and preparation method thereof
  • Titanium dioxide/silicon dioxide photocatalyst and preparation method thereof

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preparation example Construction

[0028] The preparation method of the titania / silica photocatalyst of an embodiment of the present invention, comprises the following steps:

[0029] (1) Take titanate and add it to the mixed solution of ethanol and glacial acetic acid, add water dropwise while stirring, after the dropwise addition is completed, stir and react at 40°C to 65°C to obtain a hydrolyzate;

[0030] (2) Dropping a strengthening oxidizing acid into the hydrolyzate, and continuing to stir and react at 60°C to 85°C after the dropwise addition, to obtain a titanium dioxide sol;

[0031] (3) Add titanium dioxide sol into silica gel, stir ultrasonically, and dry to obtain the product.

[0032] In the above preparation method, water is added dropwise to the system of titanate, ethanol and glacial acetic acid to control the hydrolysis rate of titanate to obtain amorphous titanium dioxide particles with smaller particle diameters. In one example, the volume ratio of glacial acetic acid, titanate, ethanol and ...

Embodiment 1

[0047] (1) Preparation of titania sol

[0048] Take a certain amount of absolute ethanol and add it to the flask, add a certain amount of glacial acetic acid, and stir for 20 minutes. A certain amount of tetrabutyl titanate was added to the above mixed solution, and after stirring for 20 minutes, a certain amount of deionized water was slowly added dropwise while stirring for 20 minutes to obtain a white turbid hydrolyzate. After the deionized water was added dropwise, the water bath was heated to 50° C. and stirred continuously for 20 min. Wherein, the volume ratio of glacial acetic acid, tetrabutyl titanate, absolute ethanol and deionized water is 1:10:100:200.

[0049] Take a certain amount of 0.2mol / L nitric acid solution, add it dropwise to the above hydrolyzed solution under stirring, and drop it in 5-10 minutes. The volume ratio of the nitric acid solution to the above reaction solution is 1:1.5. After the dropwise addition, a condenser was added to the flask, the tem...

Embodiment 2

[0062] (1) Preparation of titania sol

[0063] Take a certain amount of absolute ethanol and add it to the flask, add a certain amount of glacial acetic acid, and stir for 5 minutes. Add a certain amount of tetrabutyl titanate into the above mixed solution, stir for 30 minutes, and slowly add a certain amount of deionized water dropwise while stirring for 15 minutes to obtain a white turbid hydrolyzate. After the deionized water was added dropwise, the water bath was heated to 65° C. and stirred continuously for 10 min. Wherein, the volume ratio of glacial acetic acid, tetrabutyl titanate, absolute ethanol and deionized water is 1:8:80:150.

[0064] Take a certain amount of 0.2mol / L nitric acid solution, add it dropwise to the above hydrolyzed solution under stirring, and drop it in 10 minutes. The volume ratio of the nitric acid solution to the above reaction solution is 1:1.2. After the dropwise addition, a condenser was added to the flask, the temperature of the water bat...

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Abstract

The invention relates to a titanium dioxide/silicon dioxide photocatalyst and a preparation method thereof. The preparation method comprises the steps: firstly, dropwise adding water into a titanate,ethyl alcohol and glacial acetic acid mixed system and controlling the titanate hydrolyzing speed to obtain amorphous titanium dioxide particles with a smaller particle size; then dropwise adding strong oxidizing acid to react to obtain titanium dioxide sol; converting the amorphous titanium dioxide into anatase titanium dioxide. The prepared titanium dioxide particles have the advantages of smallparticle size, high anatase phase purity and favorability for improving photocatalytic activity. The titanium dioxide sol particles are ultrasonically stirred and dispersed into silicon dioxide sol,and the titanium dioxide particles can be loaded on silicon dioxide particles after being dried; as the silicon dioxide particles have a larger specific surface area and the silicon dioxide can inhibit phase change of titanium dioxide, photocatalytic activity is further improved. According to the method, the preparation conditions are moderate, roasting treatment is avoided, energy is saved, and meanwhile, good photocatalytic activity can be obtained.

Description

technical field [0001] The invention relates to the technical field of catalysts, in particular to a titanium dioxide / silicon dioxide photocatalyst and a preparation method thereof. Background technique [0002] Titanium dioxide is a wide bandgap semiconductor. Under the action of ultraviolet rays, anatase titanium dioxide nanoparticles have a good photocatalytic effect. The band gap of anatase titanium dioxide is 3.2eV, which is equivalent to the photon energy of 387.5nm. When irradiated by light with a wavelength less than 387.5nm, the electrons in titanium dioxide are excited and transition. After the electrons and holes are separated, they react with oxygen and water on the surface of titanium dioxide to generate strong oxidative free radicals, which make titanium dioxide exhibit strong catalytic activity. The smaller the particle size of titanium dioxide, the larger the specific surface area, the more electrons and holes it can generate when it is irradiated by ultravi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J21/08
CPCB01J21/08B01J35/004
Inventor 向柏霖林红卫陈桂罗正红
Owner HUAIHUA UNIV
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