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Carbon-doped titanium dioxide photocatalyst, and preparation method and application thereof

A technology of titanium dioxide and photocatalyst, which is applied in the direction of titanium dioxide, titanium oxide/hydroxide, physical/chemical process catalyst, etc., can solve the problems of small specific surface area, limitation, large band gap and unable to use visible light, etc., and achieve high degradation efficiency, fast degradation effect

Pending Publication Date: 2020-06-02
GUANGDONG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, pure TiO 2 There are still many shortcomings in practical applications, such as the large band gap (3.2eV), the inability to use visible light, the high recombination rate of photogenerated electron-hole pairs, and the small specific surface area, which seriously limit its use in photocatalytic treatment of environmental pollution. practical application of the problem

Method used

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  • Carbon-doped titanium dioxide photocatalyst, and preparation method and application thereof
  • Carbon-doped titanium dioxide photocatalyst, and preparation method and application thereof
  • Carbon-doped titanium dioxide photocatalyst, and preparation method and application thereof

Examples

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Embodiment 1

[0032] This embodiment is the preparation of carbon-doped titanium dioxide photocatalyst

[0033] S1. Terephthalic acid and isopropyl titanate [Ti(OC) with a molar ratio of 3:5:40:194 3 h 7 ) 4 ], methyl alcohol and DMF are mixed and added in the reactor with polytetrafluoroethylene;

[0034] S2. Place the reaction kettle in an oven, set the program, raise it to 150°C at a rate of 1°C / min, then keep it for 24h, and cool it down to room temperature naturally to obtain a precipitate;

[0035] S3. Cross-wash the precipitate obtained in step S2 with methanol and DMF, centrifuge, and vacuum-dry at 150° C. for 12 hours to obtain an activated titanium-based MOFs material;

[0036] S4. Transfer the activated MOFs material prepared in step S3 to a clean ceramic ark, then put it into a muffle furnace, raise the temperature to 350°C at a rate of 2°C / min and keep it warm for 8 hours, and then cool to room temperature with the furnace, A carbon-doped titania photocatalyst was obtained....

Embodiment 2

[0041] In this example, the carbon-doped titanium dioxide prepared in Example 1 is tested for its photocatalytic performance

[0042] The substrate of the photocatalytic reaction is bisphenol A, and the specific experimental process is as follows: 20 mg of the carbon-doped titanium dioxide sample prepared in Example 1 is added to a bisphenol A solution (100 mL) with a concentration of 20 ppm, and then under the action of visible light Carry out photocatalytic degradation reaction; Take out a certain amount of reaction solution every 30 minutes, carry out concentration measurement, degradation percentage is calculated according to the following formula: D (%)=(C 0 -C)×100 / C 0 , C 0 , C are the original concentration and final concentration, respectively. See the result image 3 .

[0043] image 3 The degradation curve of the carbon-doped titanium dioxide prepared in Example 1 of the present invention under visible light to degrade the organic pollutant bisphenol A. From ...

Embodiment 3

[0045] In this example, the carbon-doped titanium dioxide prepared in Example 1 is tested for its photocatalytic performance

[0046] The substrate of the photocatalytic reaction is phenol, and the specific experimental process is as follows: 20 mg of the carbon-doped titanium dioxide sample obtained in Example 1 is added to a phenol solution (100 mL) with a concentration of 20 ppm, and then photocatalytic degradation is carried out under the action of visible light Reaction, after 180min photocatalytic reaction, 20ppm phenol was degraded by 89%.

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Abstract

The invention relates to the technical field of catalytic materials, and concretely relates to a carbon-doped titanium dioxide photocatalyst, and a preparation method and an application thereof. A titanium-based metal organic framework is prepared from an organic ligand and a titanium source, and the titanium-based metal organic framework is used as a template to prepare the carbon-doped titaniumdioxide photocatalyst with a porous structure and a high specific surface area. According to the photocatalyst, the contact area with pollutants can be increased, photo-generated charges can be rapidly transferred to the surface of the photocatalyst, electron-hole separation is promoted, meanwhile, the band gap of TiO2 can be reduced through doping of the carbon element, and the absorption range of visible light in sunlight is widened, so the photocatalytic degradation activity is improved.

Description

technical field [0001] The invention relates to the technical field of catalytic materials, in particular to a preparation method and application of a carbon-doped titanium dioxide photocatalyst. Background technique [0002] In recent decades, with the serious water pollution problem on a global scale, it has posed a serious threat to human health and ecological environment safety. Therefore, the development of an efficient and scientific water pollution control technology has become a research hotspot. Photocatalytic technology has attracted much attention due to its advantages of high efficiency, simple process, low cost, and low secondary pollution. TiO 2 Because of its excellent photocatalytic performance, high chemical stability, low cost and environmental friendliness, it has become the main photocatalyst for the photocatalytic degradation of pollutants in the environment. However, pure TiO 2 There are still many shortcomings in practical applications, such as the...

Claims

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Application Information

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IPC IPC(8): B01J21/18B01J35/10C01G23/047C02F1/30C02F101/34
CPCB01J21/18C02F1/30C01G23/047C02F2101/345C02F2305/10C01P2006/12B01J35/39B01J35/615
Inventor 敖志敏何鑫伍明王少彬安太成
Owner GUANGDONG UNIV OF TECH
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