Hollow tubular sulfur-doped carbon nitride/graphite-phase carbon nitride homojunction photocatalyst, and preparation method and application thereof

Abstract

The invention discloses a hollow tubular sulfur-doped carbon nitride / graphite-phase carbon nitride homojunction photocatalyst, and a preparation method and application thereof. The photocatalyst takeshollow tubular sulfur-doped carbon nitride as a carrier; graphite-phase carbon nitride is loaded on the hollow tubular sulfur-doped carbon nitride; and the hollow tubular sulfur-doped carbon nitrideand the graphite-phase carbon nitride form a homojunction. The preparation method comprises the following steps: mixing and stirring melamine and trithiocyanuric acid, carrying out a hydrothermal reaction to obtain a solid tubular melamine / trithiocyanuric acid compound, modifying the surface of the solid tubular melamine / trithiocyanuric acid compound with urea, and carrying out calcining to obtainthe product. The hollow tubular sulfur-doped carbon nitride / graphite-phase carbon nitride homojunction photocatalyst can efficiently degrade tetracycline hydrochloride or tetracycline-containing wastewater with a pH value of 2-11, and has the advantages of high light absorption capacity, low photo-induced electron-hole recombination rate, good photocatalytic performance, good stability, applicability to a wide pH scope and the like.

Description

technical field [0001] The invention belongs to the technical field of photocatalysis, and in particular relates to a hollow tubular sulfur-doped carbon nitride / graphite-phase carbon nitride homojunction photocatalyst and a preparation method and application thereof. Background technique [0002] With the development and progress of society, antibiotics have been widely used. Their excessive use and incomplete metabolism make antibiotics often detected in natural water, sewage, soil and other environmental media. These antibiotics that have not been metabolized are likely to be It affects the development of biological cells, the circulation of the ecosystem and promotes the reproduction of drug-resistant pathogenic bacteria, thus adversely affecting the ecological environment and human health. At present, the commonly used methods for removing antibiotics in water environment at home and abroad include biological methods, physicochemical methods, electrochemical methods and ...

AI Technical Summary

Problems solved by technology

However, in previous studies, the photocatalysts used for photocatalytic degradation still have the following problems: low light utilization efficiency, fast photogenerated electron-hole recombination, poor photocatalytic performance, and poor stability. Greatly limit the wide application of photocatalytic degradation

However, the existing carbon nitride-based heterojunction photocatalytic materials still have problems such as weak light absorption ability and slow photogenerated electron-hole separation rate, which limit the photocatalytic performance of the material.

Therefore, how to comprehensively improve the problems of weak light absorption, slow photogenerated electron-hole separation rate, and poor photocatalytic performance in the existing carbon nitride-based heterojunction materials, and obtain a light-absorbing, photogenerated electron-hole recombination Carbon nitride photocatalyst with low efficiency, high photocatalytic performance and good stability and its preparation method with simple process, easy control of conditions and low cost are of great significance for expanding the application range of photocatalytic degradation technology in the treatment of antibiotic wastewater

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