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Oxygen doped porous g-c 3 no 4 Photocatalyst and its preparation method and application

A photocatalyst, g-c3n4 technology, which is applied in the field of photocatalytic materials, can solve the problems of less processing precursor element doping, low photocatalytic activity, and easy recombination of photogenerated electrons, so as to achieve easy and effective separation and low dosage , to promote the effect of electron transfer

Active Publication Date: 2020-10-09
LIAONING UNIVERSITY
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  • Summary
  • 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-c <sub>3</sub> no <sub>4</sub> Photocatalyst and its preparation method and application
  • Oxygen doped porous g-c <sub>3</sub> no <sub>4</sub> Photocatalyst and its preparation method and application
  • Oxygen doped porous g-c <sub>3</sub> no <sub>4</sub> Photocatalyst and its preparation method and application

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, with a heating rate of 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 an oxygen-doped porous g-C 3 N 4 The preparation method of the photocatalyst includes dissolving melamine in deionized water, adding organic matter containing aldehyde groups dropwise under heating and stirring conditions, placing the resulting solution in an oven, and drying it at 80-150°C to obtain a precursor. The precursor is ground and calcined in an inert gas environment to obtain an intermediate product; the intermediate product is calcined in an air environment to obtain the target product. Porous oxygen-doped g-C prepared by the method of the present invention 3 N 4 Nanomaterials can effectively promote electron transfer, reduce recombination rate, and improve photocatalytic activity. Using this method to treat the precursor can not only change the system structure but also introduce useful foreign atoms. It is also cheaper, simpler, and more efficient than previous oxygen doping. It is easy to operate and 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 Patents(China)
IPC IPC(8): B01J27/24B01J35/00B01J35/10B01J37/08C07C45/00C07C49/08
CPCC07C45/002B01J27/24B01J37/082B01J35/615B01J35/635B01J35/39C07C49/08
Inventor 郭强韩东远范晓星宋朋韩宇王绩伟
Owner LIAONING UNIVERSITY
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