A heterojunction interface doped composite photocatalyst and its preparation method

A composite light and heterojunction technology, applied in the direction of catalyst activation/preparation, chemical instruments and methods, physical/chemical process catalysts, etc., can solve problems such as unfavorable utilization of visible light, many by-products of carbon dioxide reduction, and difficulties in industrial production. Achieve the effect of good prospects for industrial application, enhanced recycling capacity, and large scale

Inactive Publication Date: 2020-04-10
HUAIBEI NORMAL UNIVERSITY
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, there are many by-products of carbon dioxide reduction in this technology, and zinc oxide is a wide-bandgap semiconductor that is not conducive to the utilization of visible light, so it has caused difficulties for actual industrial production.

Method used

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  • A heterojunction interface doped composite photocatalyst and its preparation method

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Experimental program
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Effect test

Embodiment 1

[0029] First, 10 g of melamine was heated to 700 °C at room temperature at 5 °C / min, and then cooled to room temperature at 20 °C / min for 5 h to prepare porous g-C. 3 N 4 Nanosheets. Then add g-C to the glycerol solution of bismuth chloride 3 N 4 The nanosheets were stirred and dispersed evenly, and then 10 mol / l sodium hydroxide was added dropwise to adjust the pH of the solution to 9. The precipitate was washed with water, centrifuged and dried. Heterojunction interfacially doped Bi 12 o 17 Cl 2 / g -C 3 N 4 composite photocatalyst.

[0030] The methane conversion rate reaches 323μmol / g / h.

Embodiment 2

[0032] First, 5 g urea and 10 g thiourea were heated to 800 °C at room temperature at 8 °C / min, and then cooled to room temperature at 30 °C / min for 6 h to prepare porous g-C. 3 N 4 Nanosheets. Then add g-C to the ethylene glycol solution of bismuth nitrate 3 N 4 The nanosheets were stirred and dispersed evenly, and then 3 mol / l ammonia water was added dropwise to adjust the pH of the solution to 10. The precipitate was washed with water, centrifuged and dried. Heterojunction interfacially doped Bi 12 o 17 Cl 2 / g -C 3 N 4 composite photocatalyst.

[0033] The methane conversion rate reaches 516μmol / g / h.

Embodiment 3

[0035] First, 150 g melamine and 50 g urea were heated to 600 °C at room temperature at 8 °C / min, and then cooled to room temperature at 5 °C / min for 3 h to prepare porous g-C. 3 N 4 Nanosheets. Then add g-C to the glycerol solution of bismuth carbonate 3 N 4 The nanosheets were stirred and dispersed evenly, and then 10 mol / l potassium hydroxide was added dropwise to adjust the pH of the solution to 12. The precipitate was washed with water, centrifuged and dried. Heterojunction interface-doped Bi 12 o 17 Cl 2 / g -C 3 N 4 composite photocatalyst.

[0036] The methane conversion rate reaches 364μmol / g / h.

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Abstract

The invention discloses a composite photocatalyst doped in a heterojunction interface and a preparation method. The prepared Bi12O17Cl2 / g-C3N4 composite photocatalyst doped in a heterojunction interface has extremely strong capability in converting carbon dioxide into methane under visible light. Since g-C3N4 and Bi12O17Cl2 nanosheets are adopted to be combined, a large-area heterojunction can be more easily formed, and thereby the separation of current carriers is promoted; by thermal diffusion, bismuth atoms on Bi12O17Cl2 at the heterojunction interface are successfully doped into a g-C3N4 crystal lattice, consequently, a super strong electric field at the heterojunction interface is induced, and super performance in reducing carbon dioxide under the visible light is achieved; the extremely large specific surface area and countless pores of porous g-C3N4 provide convenience for interface doping; the flow direction of current carriers is successfully controlled by matched band-gap structure and interface doping, selectively reducing carbon dioxide into methane is realized, and the recyclability of the photocatalyst is enhanced; material synthesis is simple and green, the scale is large, and the industrial application prospect is good.

Description

technical field [0001] The invention relates to a heterojunction interface doped composite photocatalyst and a preparation method thereof, belonging to the technical fields of energy environment and nanometer materials. Background technique [0002] Energy and environmental issues are related to sustainable economic and social development and human survival. Although fossil fuels can temporarily meet the needs of human development, fossil fuels are non-renewable energy sources. The long-term use of fossil fuels will not only reduce the reserves of fossil fuels, but also the emission of carbon dioxide, a large amount of combustion products, will lead to the greenhouse effect. Photocatalysts use solar energy to convert carbon dioxide into organic fuels such as methane, methanol, formaldehyde, and carbon monoxide, providing an ideal way to solve energy and environmental problems. The whole process of utilizing solar energy to reduce carbon dioxide into organic fuel is green a...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J27/24B01J37/08C07C1/12C07C9/04
CPCB01J27/24B01J35/004B01J37/08C07C1/12C07C9/04
Inventor 代凯王中辽吕佳丽李真霍瑶胡太平
Owner HUAIBEI NORMAL UNIVERSITY
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