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Nitrogen-doped mesoporous -carbon-wrapped titanium dioxide composite photocatalyst as well as preparation method and application thereof

A nitrogen-doped mesoporous carbon, titanium dioxide technology, applied in catalyst activation/preparation, organic compound/hydride/coordination complex catalyst, physical/chemical process catalyst, etc., can solve the problem of VOCs reducing photocatalytic efficiency, sunlight Low utilization rate and other problems, to achieve the effect of efficient solar photocatalytic degradation of VOCs, improved catalytic activity and stability, and increased specific surface area

Active Publication Date: 2018-03-23
GUANGDONG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The material can greatly improve its catalytic activity driven by sunlight, solving the problem of TiO 2 As a photocatalyst, the utilization rate of sunlight is low, and in the photocatalytic degradation of VOCs in the actual atmosphere, it cannot effectively absorb low-concentration VOCs and reduce the photocatalytic efficiency.

Method used

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  • Nitrogen-doped mesoporous -carbon-wrapped titanium dioxide composite photocatalyst as well as preparation method and application thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0031] 1. Photocatalytic material preparation

[0032] S1. 2-aminoterephthalic acid, Ti(OC) with a molar ratio of 3:2:23:118 3 h 7 ) 4 , methanol and DMF are mixed and then added to the reaction kettle with polytetrafluoroethylene;

[0033] 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 48h, and lower it to room temperature at a rate of 5°C / h to obtain a precipitate;

[0034]S3. Cross-washing the precipitate obtained in step S2 with methanol and DMF, centrifuging, and vacuum drying at 150° C. for 12 hours to obtain an activated titanium-based MOFs material;

[0035] S4. Put an appropriate amount of the activated titanium-based MOFs material prepared in step S3 into a tube furnace, raise it from room temperature to 600° C. at a rate of 1° C. / min under an Ar atmosphere, and keep it at this temperature for 6 hours; then Replace Ar with CO when cooling down to 500°C at a rate of 1°C / min 2 , and keep it for 3...

Embodiment 2

[0039] S1. A mixture of 2-aminoterephthalic acid and terephthalic acid with a molar ratio of 3:2:23:118, Ti(OC 3 h 7 ) 4 , methanol and DMF are mixed and then added to the reaction kettle with polytetrafluoroethylene;

[0040] S2. Put the reaction kettle in an oven, set the program, raise it to 150°C at a rate of 5°C / min, then keep it for 72h, and lower it to room temperature at a rate of 5°C / h to obtain a precipitate;

[0041] S3. The precipitate obtained in step S2 is cross-washed with methanol and DMF, centrifuged, and then vacuum-dried at 120° C. for 24 hours to obtain an activated titanium-based MOFs material;

[0042] S4. Put an appropriate amount of the catalyst prepared in step S3 into a tube furnace, raise the temperature from room temperature to 700° C. at a rate of 2° C. / min under an Ar atmosphere, and keep it at this temperature for 7 hours; Nitrogen-doped mesoporous carbon-wrapped TiO can be prepared by lowering the rate at room temperature 2 composite photoca...

Embodiment 3

[0044] S1. 2-aminoterephthalic acid, Ti(OC) with a molar ratio of 3:2:23:118 3 h 7 ) 4 , methanol and DMF are mixed and then added to the reaction kettle with polytetrafluoroethylene;

[0045] S2. Put 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 48 hours, and lower it to room temperature at a rate of 5°C / h to obtain a precipitate;

[0046] S3. The precipitate obtained in step S2 is cross-washed with methanol and DMF, centrifuged, and then vacuum-dried at 150° C. for 8 hours to obtain an activated titanium-based MOFs material;

[0047] S4. Put an appropriate amount of the catalyst prepared in step S3 into a tube furnace, raise the temperature from room temperature to 500° C. at a rate of 3° C. / min under an Ar atmosphere, and keep this temperature for 9 hours; When the rate of min drops to 300°C, Ar is replaced by CO 2 , keep for 60min; finally switch back to the Ar atmosphere, and continue to cool down to room tem...

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Abstract

The invention discloses a nitrogen-doped mesoporous carbon-wrapped titanium dioxide composite photocatalyst as well as a preparation method and application thereof. The preparation method comprises the following steps: dissolving an organic ligand and Ti(OC3H7)4 into a mixed liquid of methanol and DMF according to a certain ratio, performing a hydrothermal synthesis reaction, performing centrifugation, and performing drying to obtain a titanium-based metal organic skeleton material (Ti-MOF); and performing pyrolysis on the obtained Ti-MOF in an inert atmosphere, and performing oxidation etching to prepare the nitrogen-doped mesoporous carbon-wrapped TiO2 composite photocatalyst. The obtained composite photocatalyst provided by the invention not only facilitates the adsorption, enrichment and mass transfer of low-concentration VOCs, but also can efficiently degrade the VOCs under driving of sunlight; and the composite photocatalyst has high degradation activity and stability in catalytic purification of the VOCs by visible light, the synthesis of the catalyst is simple, the preparation cost is low, and the composite photocatalyst has broad environmental protection application potentiality.

Description

technical field [0001] The invention belongs to the technical field of adsorption-type photocatalytic materials, and more specifically relates to a nitrogen-doped mesoporous carbon-wrapped titanium dioxide (TiO 2 ) composite photocatalyst and its preparation method and application. Background technique [0002] Volatile organic pollutants (VOCs) are an important source of air pollution, which have caused varying degrees of pollution to the indoor environment and the atmospheric environment, seriously threatening human health and the ecological environment. How to adopt efficient scientific and technological methods to eliminate VOCs in the atmosphere has become the focus and problem of environmental protection researchers. Photocatalytic oxidation is a new type of environmental pollution control technology. This technology has the advantages of simple application process, low one-time investment and low equipment maintenance cost, and is expected to eventually oxidize VOCs ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/24B01D53/86B01D53/72
CPCB01D53/8668B01J27/24B01J35/004B01J37/086B01J37/12B01J37/14B01D2255/20707B01D2255/802B01D2257/7027B01D2257/708B01D2255/702B01D2253/204B01D53/02B01D2258/06B01D2259/802B01D2259/804B01J2531/0216B01J2531/46B01J31/1691B01J31/2239B01J31/1805Y02A50/20B01J21/063B01J27/20B01J37/06
Inventor 刘宏利马亚萍安太成李桂英陈江耀
Owner GUANGDONG UNIV OF TECH
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