Oxygen-doped porous g-C3N4 photocatalyst, preparation method thereof and application of the photocatalyst

A photocatalyst, g-c3n4 technology, applied in the field of photocatalytic materials, can solve the problems of seldom processing precursor element doping, low photocatalytic activity, easy recombination of photogenerated electrons, etc., to achieve easy and effective separation and increase specific surface area. , the effect of promoting electron transfer

Active Publication Date: 2018-09-25
LIAONING UNIVERSITY
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But the current g-C 3 N 4 The problem is that the photocatalytic activity is not high, the specific surface area is small, the photogenerated electrons are easy to recombine, and the quantum efficiency is low.
But in most of the previous studies all the doping is on the g-C 3 N 4 , few studies have been conducted on the treatment of precursors for the purpose of element doping
Although hydrogen peroxide is used as an oxidant to achieve the purpose of oxygen doping, this not only increases the cost, but also challenges the degree of oxidation. Therefore, a simple and convenient way to construct oxygen-doped porous g-C 3 N 4 imminent

Method used

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  • Oxygen-doped porous g-C3N4 photocatalyst, preparation method thereof and application of the photocatalyst
  • Oxygen-doped porous g-C3N4 photocatalyst, preparation method thereof and application of the photocatalyst
  • Oxygen-doped porous g-C3N4 photocatalyst, preparation method thereof and application of the photocatalyst

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] Example 1 Pure g-C 3 N 4 (CNO) photocatalyst

[0032] (1) Preparation method

[0033] Calcinate 2.52g of melamine directly at 550°C for 2-4h under nitrogen atmosphere, and the heating rate is 5°C / min to obtain pure g-C 3 N 4 (CNO) photocatalyst.

[0034] (2) Detection

[0035] figure 1 is the XRD test chart of sample CN0, by figure 1 It can be seen that the sample has two diffraction peaks at 13° and 27°.

[0036] figure 2 is the SEM image of sample CN0, by figure 2 Visible, pure g-C 3 N 4 The particles are relatively large, all reunited together.

Embodiment 2

[0037] Example 2 Oxygen-doped porous g-C 3 N 4 catalyst of light

[0038] (1) Preparation method

[0039] 1) Add 2.52 g of melamine into 100 mL of deionized water, heat in a water bath at 80° C. and magnetically stir for 30 minutes until dissolved to obtain a melamine solution. Under the condition of heating and stirring at 80°C, add 4.59 μL formaldehyde dropwise to the melamine solution, heat and continue to stir for 2 hours, put the resulting mixture in an oven, and dry it at 120°C for 24 hours to obtain a solid, which is the precursor;

[0040] 2) Grind the precursor in a mortar, put it into an alumina crucible, and calcinate it in a tube furnace at 550°C for 4 hours in a nitrogen atmosphere to obtain the intermediate product GN1;

[0041] 3) The intermediate product GN1 was calcined in a muffle furnace at 550°C for 4 hours in an air environment to remove the carbon residue of formaldehyde and obtain the target product—oxygen-doped porous g-C 3 N 4 Photocatalyst (CN1)....

Embodiment 3

[0046] Example 3 Oxygen-doped porous g-C 3 N 4 composite photocatalyst

[0047] (1) Preparation method

[0048] 1) Add 2.52 g of melamine into 100 mL of deionized water, heat it in a water bath at 60° C. and stir it magnetically for 30 minutes until it dissolves to obtain a melamine solution. Under heating and stirring at 60°C, add 11.46 μL of formaldehyde dropwise to the melamine solution, heat and continue to stir for 2 hours, put the resulting mixture in an oven, and dry it at 100°C for 24 hours to obtain a solid, which is the precursor;

[0049] 2) Grind the precursor in a mortar, put it into an alumina crucible, and calcinate it in a tube furnace at 550°C for 3 hours in a nitrogen atmosphere to obtain the intermediate product GN2;

[0050] 3) The intermediate product GN2 was calcined in a muffle furnace at 550°C for 3 hours in an air environment to remove the carbon residue of formaldehyde, and the target product was oxygen-doped porous g-C 3 N 4 Photocatalyst (CN2)....

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Abstract

The invention discloses a preparation method of an oxygen-doped porous g-C3N4 photocatalyst. The method comprises dissolving melamine in deionized water, adding an organic substance containing an aldehyde group dropwise under heating and stirring conditions, putting the obtained solution into an oven, drying the solution at 80-150 DEG C to obtain a precursor, grinding the precursor, calcining theprecursor in an inert gas atmosphere to obtain an intermediate product, and calcining the intermediate product in an air atmosphere to obtain a target product. The porous oxygen-doped g-C3N4 nanometermaterial prepared by the method of the invention can effectively promote electron transfer, reduce the recombination rate and increase photocatalytic activity, and precursor treatment in this mannercan not only change the structure but also introduce useful foreign atoms. Moreover, the method is cheaper than conventional oxygen doping methods and is simple and convenient to operate. The photocatalyst can effectively degrade organic pollutants under visible light irradiation.

Description

technical field [0001] The invention belongs to the technical field of photocatalytic materials, in particular to oxygen-doped and porous g-C 3 N 4 Photocatalyst and its preparation method and application. Background technique [0002] At present, with the development of industry, environmental problems have begun to affect human life. Although a large number of methods have been used to solve this problem, most of these methods will cause secondary pollution to the environment. However, photocatalytic technology relies on its economy and cannot Secondary pollution becomes one of the most promising methods. g-C 3 N 4 It is an inorganic non-metallic material with a relatively small band gap and stable photochemical properties, and is effective in degrading CO 2 , Nitrogen oxide reduction and other fields have a wide range of applications, and g-C 3 N 4 It is also an efficient photocatalyst for visible light degradation of organic pollutants. But the current g-C 3 N ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/24B01J35/00B01J35/10B01J37/08C07C45/00C07C49/08
CPCB01J27/24B01J35/004B01J35/1019B01J35/1042B01J37/082C07C45/002C07C49/08
Inventor 郭强韩东远范晓星宋朋韩宇王绩伟
Owner LIAONING UNIVERSITY
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