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2D/2Dg-C3N4CoAl-LDH hydrogen production heterojunction material as well as preparation method and application of 2D/2Dg-C3N4CoAl-LDH hydrogen production heterojunction material

A 2dg-c3n4coal-ldh, 2dg-c3n4 technology, applied in the field of material preparation and renewable clean energy utilization, can solve the problems of small contact interface area and low reactivity, achieve high purity, good photoelectric performance, and reduce production costs Effect

Inactive Publication Date: 2020-08-18
NINGDE NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In order to solve the above problems, the object of the present invention is to provide a 2D / 2D g-C 3 N 4 The preparation of / CoAl-LDH heterojunction materials and the application of photocatalytic water splitting to produce hydrogen solve the traditional C 3 N 4 The contact interface area between the matrix composite photocatalysts is small and the reactivity is low

Method used

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  • 2D/2Dg-C3N4CoAl-LDH hydrogen production heterojunction material as well as preparation method and application of 2D/2Dg-C3N4CoAl-LDH hydrogen production heterojunction material
  • 2D/2Dg-C3N4CoAl-LDH hydrogen production heterojunction material as well as preparation method and application of 2D/2Dg-C3N4CoAl-LDH hydrogen production heterojunction material
  • 2D/2Dg-C3N4CoAl-LDH hydrogen production heterojunction material as well as preparation method and application of 2D/2Dg-C3N4CoAl-LDH hydrogen production heterojunction material

Examples

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Effect test

Embodiment 1

[0022] Get 10 g of melamine in a crucible, put the lid on and place it in a muffle furnace at 550 o Calcined at C for 4 h (heating rate 2.3 o C / min) After naturally cooling to room temperature, the sample was taken out and ground to obtain a yellow carbon nitride precursor, marked as g-C 3 N 4 ; Take 0.5 g of g-C 3 N 4 Sonicate in 50 mL of deionized water for 2 h, and centrifuge the resulting suspension at 3000 rpm to remove g-C at the bottom. 3 N 4 Precipitate, giving g-C 3 N 4 nanosheet suspension.

Embodiment 2

[0024] Get 10 g of melamine in a crucible, put the lid on and place it in a muffle furnace at 550 o Calcined at C for 4 h (heating rate 2.3 o C / min) After naturally cooling to room temperature, the sample was taken out and ground to obtain a yellow carbon nitride precursor, marked as g-C 3 N 4 ; Take 0.5 g of g-C 3 N 4 Sonicate in 50 mL of deionized water for 2 h, and centrifuge the resulting suspension at 3000 rpm to remove g-C at the bottom. 3 N 4 Precipitate, giving g-C 3 N 4nanosheet suspension. Add 0.003 mol Co(NO 3 ) 2 and 0.001 mol Al(NO 3 ) 2 , 0.5 g urea and stirred for 0.5 h at 120 o C under hydrothermal reaction for 12 h, cooled to room temperature and centrifuged, the precipitate was washed with distilled water and ethanol, 60 o The powder solid obtained by C vacuum drying is marked as CN-CoAl 0.003 .

Embodiment 3

[0026] Get 10 g of melamine in a crucible, put the lid on and place it in a muffle furnace at 550 o Calcined at C for 4 h (heating rate 2.3 o C / min) After naturally cooling to room temperature, the sample was taken out and ground to obtain a yellow carbon nitride precursor, marked as g-C 3 N 4 ; Take 0.5 g of g-C 3 N 4 Sonicate in 50 mL of deionized water for 2 h, and centrifuge the resulting suspension at 3000 rpm to remove g-C at the bottom. 3 N 4 Precipitate, giving g-C 3 N 4 nanosheet suspension. Add 0.006 mol Co(NO 3 ) 2 and 0.002 mol Al(NO 3 ) 2 , 0.5 g urea and stirred for 0.5 h at 120 o C under hydrothermal reaction for 12 h, cooled to room temperature and centrifuged, the precipitate was washed with distilled water and ethanol, 60 o The powder solid obtained by C vacuum drying is marked as CN-CoAl 0.006 .

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Abstract

The invention discloses preparation of a 2D / 2D g-C3N4 / CoAl-LDH heterojunction material and application of the 2D / 2D g-C3N4 / CoAl-LDH heterojunction material in photocatalytic decomposition of water into hydrogen, and belongs to the technical field of material preparation and renewable clean energy utilization. According to the preparation of the heterojunction material, a g-C3N4 nanosheet is used as a template, and CoAl-LDH is loaded on the surface of the C3N4 nanosheet through an in-situ one-step hydrothermal method to form a two-dimensional / two-dimensional planar heterojunction composite material. The larger contact interface area of the obtained planar heterostructure provides more high-speed channels for migration and separation of photon-generated carriers; meanwhile, due to the surface characteristics of the 2D nanosheets, the 2D nanosheets are similar to modification between molecular layers, the proportion of surface atoms is kept as large as possible, and more active sites areprovided for a photocatalytic reaction. Therefore, the composite heterojunction sample shows excellent performance in a photocatalytic hydrogen production reaction. The preparation method disclosed bythe invention is simple to operate, high in catalyst activity and stability and relatively great in application potential.

Description

technical field [0001] The invention belongs to the technical field of material preparation and renewable clean energy utilization, and specifically relates to a 2D / 2Dg-C 3 N 4 Preparation of / CoAl-LDH heterojunction materials and application of photocatalytic water splitting for hydrogen production. Background technique [0002] As a pollution-free clean energy, hydrogen energy has attracted extensive attention of researchers in recent years. The energy generated by hydrogen combustion is as high as 122KJ·g -1 , 2.75 times that of hydrocarbon fuels and 5 times that of methanol and ethanol. Therefore, hydrogen is considered to be the most ideal fuel and energy carrier in the future. However, the current source of hydrogen energy is mainly through the distillation and reforming of fossil fuels and the pyrolysis and electrolysis of natural gas and coal gas. These methods all need to consume a large amount of fossil fuels, which is not conducive to the sustainable developm...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/24B01J37/08B01J37/34B01J37/10B01J37/03C01B3/04
CPCB01J27/24B01J37/082B01J37/343B01J37/10B01J37/031C01B3/042B01J35/39Y02E60/36
Inventor 夏宇宙颜桂炀翟苓帆许贺可胡一凡吴同业王希虎
Owner NINGDE NORMAL UNIV
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