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

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,...

AI Technical Summary

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.

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