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 homogeneous heterojunction photocatalyst as well as a preparation method and application thereof. The photocatalyst is preparedby taking carbon nitride as a carrier, and the carbon nitride is modified by phosphorus-doped carbon nitride. The preparation method comprises the steps of mixing the phosphorus-doped carbon nitridewith melamine, and calcining the obtained mixture precursor to obtain the phosphorus doped carbon nitride / carbon nitride homogeneous heterojunction photocatalyst. The photocatalyst provided by the invention has the advantages of green and environmental friendlyness, completely free from metal doping, strong in absorption of visible light, large in specific surface area, fast in photo-generated charge separation rate, high in photocatalytic activity, stable in chemical properties, corrosion-resistant, and the like; the preparation method of the photocatalyst has the advantages of simple preparation process, easy control, easy obtaining of raw materials, low cost, is suitable for continuous large-scale mass production, and the like. The photocatalyst provided by the invention can be used fordegrading antibiotic wastewater, and has the advantages of stable photocatalytic performance, high corrosion resistance and high degradation efficiency, thus having a very good practical applicationprospect.

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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