Phosphorus-doped carbon nitride/carbon nitride homogeneous heterojunction photocatalyst and its preparation method and application

Abstract

The invention discloses a phosphorus-doped carbon nitride / carbon nitride homojunction photocatalyst and its preparation method and application. The photocatalyst uses carbon nitride as a carrier, and the carbon nitride is modified with phosphorus-doped nitride. carbon. The preparation method includes: mixing phosphorus-doped carbon nitride and melamine, and calcining the resulting mixture precursor to obtain a phosphorus-doped carbon nitride / carbon nitride homo-heterojunction photocatalyst. The photocatalyst of the present invention has the advantages of being green and environmentally friendly, completely free of metal doping, strong visible light absorption ability, increased specific surface area, fast photogenerated charge separation rate, high photocatalytic activity, stable chemical properties, corrosion resistance, etc. Its preparation method has the following advantages: The process is simple, easy to control, the raw materials are easily available, the cost is low, and it is suitable for continuous large-scale batch production. The photocatalyst of the present invention can be used to degrade antibiotic wastewater, has the advantages of stable photocatalytic performance, strong corrosion resistance, and high degradation efficiency, and has good practical application prospects.

Description

technical field [0001] The invention belongs to the technical field of photocatalysis, and in particular relates to a phosphorus-doped carbon nitride / carbon nitride homogeneous heterojunction photocatalyst and a preparation method and application thereof. Background technique [0002] In recent years, due to the increasingly prominent problems of energy crisis and environmental pollution, the use of photocatalysts to degrade pollutants in the environment has attracted extensive attention as an environmentally friendly and low-cost technology. At present, the commonly used photocatalyst is titanium dioxide. Although titanium dioxide has the advantages of non-toxicity, high efficiency and low cost, its wide bandgap makes it only able to absorb about 4% of the ultraviolet light in sunlight, which greatly limits its application. Therefore, it is very important to develop a photocatalyst or its composite material that can catalyze under visible light, is cheap, and has stable pe...

AI Technical Summary

Problems solved by technology

Although heterogeneous heterojunctions based on carbon nitride can improve the photocatalytic effect of carbon nitride, there are often obvious differences in physicochemical properties between foreign substances and carbon nitride, which may greatly affect the performance of the resulting heterojunction. Compatibility, homogeneity and stability, also undercut the inherent advantages of metal-free carbon nitride

Therefore, how to comprehensively improve the problems of carbon nitride photogenerated electron-hole pair recombination rate, low specific surface area, low light absorption efficiency, and poor photocatalytic activity is of great significance for expanding the application range of carbon nitride materials.

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