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Enol-ketone covalent organic framework/graphite phase carbon nitride composite photocatalyst and its preparation method and application

A technology of covalent organic framework and graphite phase carbon nitride, which is applied in organic compound/hydride/coordination complex catalysts, physical/chemical process catalysts, chemical instruments and methods, etc., can solve the problem of insufficient light absorption performance, reaction Few active sites, high electron-hole pair recombination rate, etc., to achieve the effect of favorable photocatalytic performance, strong chemical and thermal stability, and improved photocatalytic activity

Active Publication Date: 2022-02-22
HUNAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the constructed carbon nitride-based semiconductor heterojunction still has the following problems: low specific surface area, few reactive active sites, insufficient light absorption performance, easy recombination of photogenerated carriers, high electron-hole pair recombination rate, catalytic degradation Insufficient performance, etc., the existence of these problems seriously limits the application range of carbon nitride-based semiconductor heterojunction
In addition, the existing composite methods still have disadvantages such as complicated process, difficult to obtain raw materials, high raw material cost, poor preparation efficiency, and low yield. Wide application in
In addition, due to the poor crystallinity of the existing covalent organic framework / carbon nitride composite materials, the structure is prone to dissociation during the photocatalytic reaction process and the stability is poor.

Method used

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  • Enol-ketone covalent organic framework/graphite phase carbon nitride composite photocatalyst and its preparation method and application
  • Enol-ketone covalent organic framework/graphite phase carbon nitride composite photocatalyst and its preparation method and application
  • Enol-ketone covalent organic framework/graphite phase carbon nitride composite photocatalyst and its preparation method and application

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Embodiment 1

[0037] A kind of enol-ketone covalent organic framework / graphite carbon nitride composite photocatalyst, including graphite phase carbon nitride and enol-ketone covalent organic framework, enol-ketone covalent organic framework supported on graphite Phase carbon nitride, wherein the mass ratio of graphite phase carbon nitride and enol-ketone covalent organic framework is 1:0.01. Graphite phase carbon nitride is lamellar. The enol-ketone covalent organic framework is fibrous rod-shaped with a diameter of 116nm.

[0038] A preparation method of the enol-ketone covalent organic framework / graphite phase carbon nitride composite photocatalyst in the above-mentioned present embodiment specifically comprises the following steps:

[0039] (1) Put 8g of melamine into a crucible, place it in a muffle furnace, heat it up to 550°C at a heating rate of 2.3°C / min, and keep it at 550°C for 4 hours, take it out after natural cooling, and grind it with a mortar , to obtain a yellow powder sa...

Embodiment 2

[0043] A kind of enol-ketone type covalent organic framework / graphite phase carbon nitride composite photocatalyst, basically the same as embodiment 1, the difference is only: graphite phase carbon nitride and enol-ketone type covalent organic framework in embodiment 2 The mass ratio of the skeleton is 1:0.05.

[0044] A preparation method of the enol-ketone covalent organic framework / graphite phase carbon nitride composite photocatalyst in the above-mentioned embodiment is basically the same as in Example 1, the only difference being that in Example 2 the enol-ketone covalent The dosage of the valent organic framework is 25mg.

[0045] The enol-ketone covalent organic framework / graphite phase carbon nitride composite photocatalyst prepared in Example 2 is named 5% TpMa / CN.

Embodiment 3

[0047] A kind of enol-ketone type covalent organic framework / graphite phase carbon nitride composite photocatalyst, basically the same as embodiment 1, the difference is only: in embodiment 3, graphite phase carbon nitride and enol-ketone type covalent organic framework The mass ratio of the skeleton is 1:0.25.

[0048] A preparation method of the enol-ketone covalent organic framework / graphite phase carbon nitride composite photocatalyst in the above-mentioned embodiment is basically the same as in Example 1, the only difference being that in Example 3 the enol-ketone covalent The dosage of the valent organic framework is 125 mg.

[0049] The enol-ketone covalent organic framework / graphite phase carbon nitride composite photocatalyst prepared in Example 3 is named 25% TpMa / CN.

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Abstract

The invention discloses an enol-ketone type covalent organic framework / graphite-phase carbon nitride composite photocatalyst and its preparation method and application. The composite photocatalyst includes graphite-phase carbon nitride on which enol-ketone is loaded covalent organic framework. The preparation method comprises mixing graphite-phase carbon nitride dispersion liquid with enol-ketone covalent organic skeleton, ultrasonication and stirring to obtain the composite catalyst. The enol-ketone type covalent organic framework / graphite phase carbon nitride composite photocatalyst of the present invention has high specific surface area, many reaction active sites, wide light absorption range, low electron-hole pair recombination rate, good photocatalytic performance, It has the advantages of good stability and environmental protection, and can be widely used to degrade organic pollutants, and the degradation effect is good, so it has good application value and application prospect. The preparation method of the invention has the advantages of simple process, convenient operation, readily available raw materials, low cost, high preparation efficiency, high yield, etc., is suitable for large-scale preparation, and is beneficial to industrialized production.

Description

technical field [0001] The invention belongs to the technical field of material preparation and environmental catalysis, and relates to a preparation method of a carbon nitride composite photocatalyst, in particular to an enol-ketone type covalent organic framework modified graphite phase carbon nitride composite photocatalyst and its Preparation methods and applications. Background technique [0002] In the past few decades, environmental problems have become increasingly serious. As a major source of environmental pollution, water pollution from industrial organic chemicals and agricultural fertilizer discharges has become an urgent problem to be solved. Persistent organic pollutants such as pharmaceuticals and personal care products, pesticides and herbicides are observed in natural and wastewater. Traditional sewage treatment technologies are difficult to deal with new pollutants. Photocatalysis has proven to be an ideal solution for harnessing solar energy. In fact,...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J27/24B01J31/06B01J35/10C02F1/30C02F101/30C02F101/34C02F101/38
CPCB01J27/24B01J31/069C02F1/30C02F2101/30C02F2101/34C02F2101/38C02F2305/10B01J35/39B01J35/61
Inventor 王晗曾光明许飘王紫薇周成赟汪文军秦红黄丹莲姜丹妮何阳卓
Owner HUNAN UNIV
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