Two-dimensional carbon nitride photocatalyst containing D-A structure as well as preparation method and application thereof

A D-A, catalyst technology, applied in catalyst activation/preparation, physical/chemical process catalysts, chemical instruments and methods, etc., can solve the problems of high electron-hole pair recombination rate, insufficient visible light absorption, and high exciton binding energy, Achieve the effect of many active sites, efficient photocatalytic reduction of CO2 activity, and wide light response range

Active Publication Date: 2021-02-19
JIANGSU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But 2D g-C 3 N 4 Defects in the structure and poor crystallinity make it have some inherent disadvantages, such as insufficient visible light absorption, high exciton binding energy, high electron-hole pair recombination rate, etc., which limit the 2D g-C 3 N 4 Applications

Method used

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  • Two-dimensional carbon nitride photocatalyst containing D-A structure as well as preparation method and application thereof
  • Two-dimensional carbon nitride photocatalyst containing D-A structure as well as preparation method and application thereof
  • Two-dimensional carbon nitride photocatalyst containing D-A structure as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] (1) Bulk phase g-C 3 N 4 Preparation of:

[0032] Put 3 g of melamine in a 2×4 cm porcelain boat, and seal it with tin foil. Then in the muffle furnace, the temperature was raised to 550°C at a rate of 2°C / min, roasted for 4 hours, cooled naturally, and the obtained yellow blocky solid was ground into powder;

[0033] (2)2D g-C 3 N 4 Preparation of nanosheets:

[0034] bulk phase g-C 3 N 4 The powder was added to a 2×4cm porcelain boat and sealed with tin foil. Use a 1mm diameter needle to make a row of small holes (5 pcs) in the middle of the foil. Then in the muffle furnace, the temperature was raised to 550 °C at a rate of 5 °C / min, and it was calcined at this temperature for 4 h, and cooled naturally to obtain 2D g-C 3 N 4 Nanosheets.

[0035] (3) 2D g-C 3 N 4 - Preparation of DA

[0036] Disperse 0.005g, 0.01g, 0.03g, 0.05g of 3,6-dibromocarbazole into 10mL of acetone, ultrasonic power 1000W, ultrasonic time 0.5h, ultrasonic to obtain solution 1. The...

Embodiment 2

[0039] (1) Bulk phase g-C 3 N 4 Preparation of:

[0040] Put 3 g of melamine in a 2×4 cm porcelain boat, and seal it with tin foil. Then in the muffle furnace, the temperature was raised to 550°C at a rate of 2°C / min, roasted for 4 hours, cooled naturally, and the obtained yellow blocky solid was ground into powder;

[0041] (2)2D g-C 3 N 4 Preparation of nanosheets:

[0042] bulk phase g-C 3 N 4 The powder was added to a 2×4cm porcelain boat and sealed with tin foil. Use a 1mm diameter needle to make a row of small holes (5 pcs) in the middle of the foil. Then in the muffle furnace, the temperature was raised to 550 °C at a rate of 5 °C / min, and it was calcined at this temperature for 4 h, and cooled naturally to obtain 2D g-C 3 N 4 Nanosheets.

[0043] (3) 2D g-C 3 N 4 - Preparation of DAb

[0044] Disperse 0.01g of 1,4-dibromobenzene into 10mL of acetone, ultrasonic power 1000W, ultrasonic time 0.5h, ultrasonic to obtain solution 1. Then 0.2g 2D g-C 3 N 4 T...

Embodiment 3

[0047] (1) Bulk phase g-C 3 N 4 Preparation of:

[0048] Put 3 g of melamine in a 2×4 cm porcelain boat, and seal it with tin foil. Then in the muffle furnace, the temperature was raised to 550°C at a rate of 2°C / min, roasted for 4 hours, cooled naturally, and the obtained yellow blocky solid was ground into powder;

[0049] (2)2D g-C 3 N 4 Preparation of nanosheets:

[0050] bulk phase g-C 3 N 4 The powder was added to a 2×4cm porcelain boat and sealed with tin foil. Use a 1mm diameter needle to make a row of small holes (5 pcs) in the middle of the foil. Then in the muffle furnace, the temperature was raised to 550 °C at a rate of 5 °C / min, and it was calcined at this temperature for 4 h, and cooled naturally to obtain 2D g-C 3 N 4 Nanosheets.

[0051] (3) 2D g-C 3 N 4 - Preparation of DAdbt

[0052] Disperse 0.01g of 4,7-dibromo-2,1,3-benzothiadiazole into 10mL of methanol, ultrasonic power 1000W, ultrasonic time 0.5h, ultrasonic to obtain solution 1. Then 0....

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Abstract

The invention belongs to the technical field of preparation of new energy conversion materials, and particularly relates to a two-dimensional carbon nitride photocatalyst containing a D-A structure aswell as a preparation method and application thereof. Firstly, a bulk-phase carbon nitride material (g-C3N4) is prepared by a high-temperature polymerization method, and then two-dimensional carbon nitride (2D g-C3N4) nanosheets are prepared by an oxidative stripping method at high temperature. Finally, a 2D g-C3N4-DA catalytic material with an intra-molecular DA structure is prepared through reaction of 2D g-C3N4 and organic molecules. The photocatalytic material with an intra-molecular DA structure is prepared by simple high-temperature polymerization and reaction with organic molecules, and the operation is simple and convenient; and the obtained 2D g-C3N4-DA photocatalytic material is used for preparing hydrocarbon fuel through catalytic conversion of CO2 molecules, extra energy investment is not needed in the reaction process, a cocatalyst and a sacrificial agent do not need to be added, and the method is green and environmentally friendly.

Description

technical field [0001] The invention belongs to the technical field of preparation of new energy conversion materials, in particular to a two-dimensional carbon nitride photocatalyst containing a D-A structure, a preparation method and an application. The present invention firstly prepares bulk phase carbon nitride material (g-C 3 N 4 ), and then two-dimensional carbon nitride (2D g-C 3 N 4 )Nanosheets. Final pass 2D g-C 3 N 4 2D g-C with intramolecular donor-acceptor (D-A) structure prepared by reacting with organic molecules 3 N 4 (2D g-C 3 N 4 -DA) catalytic material and used for photocatalytic CO 2 Reduction to produce CO, CH 4 and other hydrocarbon fuel fields. Background technique [0002] Photocatalytic technology refers to the technology that uses light energy to convert chemical reactions that need to be carried out under severe conditions into reactions under mild conditions in the presence of catalysts. This technology uses clean and unlimited sunligh...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/24B01J31/02B01J35/00B01J37/08C01B32/40C07C1/02C07C9/04
CPCB01J27/24B01J31/0244B01J31/02B01J31/0271B01J35/004B01J37/082B01J37/08C01B32/40C07C1/02C07C9/04
Inventor 宋相海汪梅张馨予李鑫霍鹏伟
Owner JIANGSU UNIV
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