Enol-ketone type covalent organic framework/graphite phase carbon nitride composite photocatalyst as well as preparation method and application thereof

Abstract

The invention discloses an enol-ketone covalent organic framework/graphite phase carbon nitride composite photocatalyst as well as a preparation method and application thereof. The composite photocatalyst comprises graphite phase carbon nitride, and an enol-ketone covalent organic framework is loaded on the graphite phase carbon nitride. The preparation method comprises the following steps: mixing a graphite phase carbon nitride dispersion liquid with the enol-ketone covalent organic framework, and carrying out ultrasonic treatment and stirring to obtain the composite catalyst. The enol-ketone type covalent organic framework/graphite-phase carbon nitride composite photocatalyst has the advantages of high specific surface area, multiple reaction active sites, wide light absorption range, low electron-hole pair recombination rate, good photocatalytic performance, good stability, environmental protection and the like, can be widely used for degrading organic pollutants, has a good degradation effect, and can be widely applied to degradation of organic pollutants. Good application values and application prospects are realized. The preparation method disclosed by the invention has the advantages of simple process, convenience in operation, easily available raw materials, low cost, high preparation efficiency, high yield and the like, is suitable for large-scale preparation and is beneficial to industrial 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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