Potassium element doped porous carbon nitride photocatalyst and its preparation method and application

Abstract

The invention discloses a potassium-doped porous carbon nitride photocatalyst and a preparation method thereof, and an application. The photocatalyst includes a porous carbon nitride material which isdoped with potassium. The preparation method includes mixing the porous carbon nitride material with a sylvite solution, and performing drying; and performing high temperature calcining on the mixture so that the potassium-doped porous carbon nitride photocatalyst can be obtained. The photocatalyst has advantages of large specific surface area, large number of holes, fast photogenerated carrier separation and migration rate, strong light absorption capacity and high photocatalytic activity; the photocatalyst is a novel visible photocatalyst with a novel structure and excellent photocatalysisperformance, and has good use values and application values; and the preparation method has advantages of simple process, easy operation and low cost. The photocatalyst can be widely used for degrading organic pollutants so that effective removal of the organic pollutants can be realized; and the photocatalyst has advantages of being simple in operation, low in cost and good in removing effect, and has good application prospects.

Description

technical field [0001] The invention belongs to the field of visible light catalysis, and relates to a potassium element-doped porous carbon nitride photocatalyst, a preparation method and application thereof. Background technique [0002] Environmental pollution and energy crisis have become two stumbling blocks to the sustainable development of modern society. Among them, the pollution of antibiotic wastewater is becoming more and more serious, threatening the health of animals, plants and even human beings in water. Although researchers have adopted a variety of methods to treat antibiotic wastewater, conventional chemical adsorption methods, physical methods and biological methods are not ideal for the treatment of antibiotic wastewater. In order to solve the problem of antibiotic pollution in wastewater, the researchers proposed a new way, that is, photocatalytic technology that uses photocatalysts to catalyze reactions under sunlight. The photocatalytic technology is ...

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Problems solved by technology

However, monomeric g-C 3 N 4 There are also disadvantages that cannot be ignored, such as small specific surface area, fast recombination rate of photogenerated carriers, low quantum efficiency, and weak ability to use solar energy.

In order to improve the above-mentioned problems of monomeric carbon nitride, the researchers proposed to use the hard template method to prepare porous carbon nitride. However, hydrofluoric acid will be used in the process of preparing porous carbon nitride by the hard template method, which is likely to cause secondary pollution. , will cause great harm to the environment, and the resulting porous carbon nitride still has small specific surface area, small number of holes, fast recombination rate of photogenerated carriers, low quantum efficiency, poor light absorption ability, and poor photocatalytic activity. The existence of these problems seriously limits the application of porous carbon nitride in the field of photocatalysis

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