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Silver-carbon-codoped bicrystal mesoporous titanium dioxide visible light photocatalyst and preparation method thereof

A technology of mesoporous titanium dioxide and photocatalyst, which is applied in the direction of metal/metal oxide/metal hydroxide catalyst, physical/chemical process catalyst, chemical instrument and method, etc., can solve the problem of weak photocatalytic activity of visible light, and achieve improvement Effect of photocatalytic activity and high specific surface area

Inactive Publication Date: 2013-09-25
CHINA ACADEMY OF SPACE TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The purpose of the present invention is to solve the problem that the visible light photocatalytic activity of titanium dioxide-based photocatalysts is weak, and to provide a silver-carbon co-doped twin-crystal mesoporous titanium dioxide visible light photocatalyst and a preparation method thereof. The visible light photocatalyst of the titanium dioxide has good catalytic activity

Method used

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  • Silver-carbon-codoped bicrystal mesoporous titanium dioxide visible light photocatalyst and preparation method thereof
  • Silver-carbon-codoped bicrystal mesoporous titanium dioxide visible light photocatalyst and preparation method thereof
  • Silver-carbon-codoped bicrystal mesoporous titanium dioxide visible light photocatalyst and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Preparation of twin-crystal mesoporous titania:

[0031] Dissolve 0.8g of surfactant P123 in 30ml of ethanol, stir for 30 minutes, then slowly add 1.0g of titanium tetrachloride and 0.8g of titanium isopropoxide, continue stirring for 60 minutes, then pour the sol from the beaker into an evaporating dish, Place the evaporating dish containing the sol in a constant temperature and humidity box with a relative humidity of 80% and a temperature of 45° C. for 24 hours, and finally obtain a white mesoporous titanium dioxide powder;

[0032] The above mesoporous titanium dioxide powder was calcined for 4 hours in a nitrogen atmosphere at a temperature of 400°C, then switched to an air atmosphere at a temperature of 300°C, and continued to be calcined for 2 hours to obtain a twin-crystal mesoporous titanium dioxide with an anatase phase and a rutile phase skeleton , its small-angle XRD diffraction pattern is as follows figure 1 As shown, its TEM picture is shown in figure 2...

Embodiment 2

[0045] Preparation of twin crystal mesoporous titania

[0046] With embodiment 1.

[0047] Preparation of silver-carbon co-doped twin-crystal mesoporous titania

[0048] Experimental medicine used and operating procedure are the same as embodiment 1, and the consumption of changing silver nitrate is: 0.25g. The silver content of the sample was 2.6 wt.%.

[0049] Visible-light photocatalytic activity of silver-carbon co-doped bicrystalline mesoporous titania

[0050] The experimental conditions were the same as in Example 1, and the degradation rate of methylene blue was 68% after 180 minutes of visible light irradiation.

Embodiment 3

[0052] Preparation of twin crystal mesoporous titania

[0053] With embodiment 1.

[0054] Preparation of silver-carbon co-doped twin-crystal mesoporous titania

[0055] Used experimental medicine and operation steps are the same as embodiment 1, the consumption of changing silver nitrate is: 0.2g. The silver content of the sample was 2.1 wt.%.

[0056] Visible-light photocatalytic activity of silver-carbon co-doped bicrystalline mesoporous titania

[0057] The experimental conditions are the same as in Example 1, and the degradation rate of methylene blue after 180 minutes of visible light irradiation is 63%.

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Abstract

The invention relates to a silver-carbon-codoped bicrystal mesoporous titanium dioxide visible light photocatalyst and a preparation method thereof and belongs to the technical field of visible light photocatalytic materials. The visible light photocatalyst consists of silver nanoparticles, amorphous carbon and bicrystal mesoporous titanium dioxide. Compared with the commercial anatase phase titanium dioxide nano-particle (particle size is 5-10 nm), silver-carbon-codoped bicrystal mesoporous titanium oxide prepared by utilizing the method shows an obviously enhanced visible light photocatalytic activity.

Description

technical field [0001] The invention relates to a silver-carbon co-doped bicrystalline mesoporous titanium dioxide visible light photocatalyst and a preparation method thereof, belonging to the technical field of visible light photocatalytic materials. Background technique [0002] Titanium dioxide (TiO 2 ) is a very important semiconductor material for photocatalysis, which is widely used in the photodegradation reaction of various pollutants. However, due to its large semiconductor band gap (3.2eV), its photocatalytic activity is limited to the ultraviolet region with high photon energy. However, most of the energy (>70%) of sunlight is concentrated in the visible light region. In order to effectively utilize solar energy, researchers have done a lot of research on the visible light photocatalytic activity of titanium dioxide. One method is to narrow the band gap energy of titanium dioxide through element doping, so that it can absorb more visible light, such as nitro...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/50
Inventor 崔方明张晓媛
Owner CHINA ACADEMY OF SPACE TECHNOLOGY
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