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Nitrogen-defect graphite-phase carbon nitride nanosheet photocatalyst, method for preparing same and application

A graphitic carbon nitride and photocatalyst technology, applied in the field of photocatalytic materials, can solve the problems of low photocatalytic activity, small specific surface area, large particle size, etc., and achieve the effects of simple operation, cheap raw materials, and reduced recombination rate

Active Publication Date: 2018-08-10
LIAONING UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the nitrogen-deficient materials reported in previous studies have large particle size, small specific surface area, single morphology, and low photocatalytic activity.

Method used

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  • Nitrogen-defect graphite-phase carbon nitride nanosheet photocatalyst, method for preparing same and application
  • Nitrogen-defect graphite-phase carbon nitride nanosheet photocatalyst, method for preparing same and application
  • Nitrogen-defect graphite-phase carbon nitride nanosheet photocatalyst, method for preparing same and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Example 1 Pure g-C 3 N 4 (CNO) photocatalyst

[0030] (1) Preparation method

[0031] Calcinate 2.52g of melamine directly at 550°C for 4h under nitrogen atmosphere, and the heating rate is 5°C / min to obtain pure g-C 3 N 4 (CNO) photocatalyst.

[0032] (2) Detection

[0033] figure 1 For the XRD test figure of the CNO prepared in embodiment 1, by figure 1 It can be seen that the sample has two diffraction peaks at 13° and 27°. According to the formula, the grain size of the sample is calculated to be about 15.2nm.

Embodiment 2

[0035] Example 2 Nitrogen defect graphite phase carbon nitride nanosheet photocatalyst

[0036] (1) Preparation method

[0037] 1) Put 2.5g of melamine into the crucible for calcination at 350°C and keep it for 5 hours, then cool naturally to obtain precursor A (solid);

[0038] 2) Then, 2g of precursor A was dissolved in 60mL of deionized water to prepare a solution with a concentration of 0.2mol / L, heated at 60°C, magnetically stirred, then 0.75g of oxalic acid was added dropwise, and the resulting mixture was put into an oven , and dried at 100-110°C to obtain precursor B; put precursor B into a mortar and grind it, put it in an alumina crucible after grinding, and put it in a tube furnace under a nitrogen atmosphere at 550°C Calcined for 4h to obtain the target product nitrogen-deficient graphite phase carbon nitride g-C 3 N 4 Nanosheet photocatalyst (CN1);

[0039] 3) Put the target product GN1 in a muffle furnace and calcinate at 550°C for 2 hours in an air environme...

Embodiment 3

[0044] Example 3 Nitrogen-deficient graphite phase carbon nitride composite photocatalyst

[0045] (1) Preparation method

[0046] 1) Put 2.52g of melamine into the crucible for calcination at 420°C and keep it for 5 hours, then cool naturally to obtain precursor A (solid);

[0047] 2) Then, 2 g of precursor A was dissolved in 60 mL of deionized water to prepare a solution with a concentration of 0.2 mol / L, and 1.5 g of oxalic acid was added under heating conditions at 60°C and magnetic stirring, and the resulting mixture was put into an oven, Dry at 100-110°C to obtain precursor B; grind precursor B in a mortar, put it into an alumina crucible, and calcinate at 550°C for 4 hours in a tube furnace under nitrogen atmosphere. Obtain the target product nitrogen defect graphitic phase carbon nitride g-C 3 N 4Nanosheet photocatalyst (GN2);

[0048] 3) The product GN2 was calcined in a muffle furnace at 550°C for 2 hours in an air environment to remove the carbon residue of oxal...

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Abstract

The invention discloses a nitrogen-defect graphite-phase carbon nitride nanosheet photocatalyst, a method for preparing the same and application. The method includes 1), placing nitrogen-rich organicmatters such as melamine, dicyandiamide and thiourea urea into crucibles, keeping carrying out high-temperature calcination treatment on the nitrogen-rich organic matters at the temperatures ranging from 220-420 DEG C for 0.5-10 h, and carrying out cooling to obtain precursors; 2), grinding the precursors, and calcining the precursors in inert gas environments to obtain a product which is the nitrogen-defect graphite-phase carbon nitride nanosheet photocatalyst. The nitrogen-defect graphite-phase carbon nitride nanosheet photocatalyst, the method and the application have the advantages that large quantities of catalytic reaction sites can be provided by nitrogen-defect graphite-phase carbon nitride nanometer materials prepared by the aid of the method, photo-induced electrons can be trapped by nitrogen defects, photo-induced electron-hole separation can be effectively carried out, the composition rate can be reduced, and the photocatalytic activity can be improved; organic pollutants can be effectively degraded by the nitrogen-defect graphite-phase carbon nitride nanosheet photocatalyst in visible light irradiation.

Description

technical field [0001] The invention belongs to the technical field of photocatalytic materials, and in particular relates to a nitrogen-deficient carbon nitride nanosheet photocatalyst and a preparation method and application thereof. Background technique [0002] With the development of human society, the problem of environmental pollution has become increasingly prominent and needs to be solved urgently. Among the many environmental purification methods, photocatalytic environmental purification technology has attracted much attention. Photocatalytic technology is an environmentally friendly technology that can use sunlight to degrade organic pollutants. It has the characteristics of no secondary pollution and recyclable regeneration. In recent years, graphitic carbon nitride, as a metal-free material, has received great attention from scientific researchers. Graphite carbon nitride has a relatively small band gap and stable photochemical properties. It can degrade organi...

Claims

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Application Information

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IPC IPC(8): B01J27/24B01J35/10B01J35/02B01D53/86B01D53/72
CPCB01D53/8668B01J27/24B01J35/40B01J35/60B01J35/39
Inventor 郭强韩东远范晓星韩宇王绩伟宋朋
Owner LIAONING UNIVERSITY
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