Preparation method of defective titanium dioxide/ultrathin carbon nitride/defective titanium dioxide Z-type heterojunction photocatalyst

Abstract

The invention discloses a preparation method of a defective titanium dioxide / ultrathin carbon nitride / defective titanium dioxide Z-type heterojunction photocatalyst, and belongs to the field of photocatalytic water treatment. Comprising the following steps: 1, preparing TiO2 nanoparticles by a sol-gel method; 2, carrying out secondary high-temperature calcination to obtain thin g-C3N4 / ; 3, carrying out ball milling and compounding to obtain TiO2-x / ultrathin g-C3N4 / TiO2-x of a sandwich structure; and 4, carrying out solid-phase reduction to obtain the final defective titanium dioxide / ultrathin carbon nitride / defective titanium dioxide Z-type heterojunction photocatalyst. According to the preparation method of the defective titanium dioxide / ultrathin carbon nitride / defective titanium dioxide Z-type heterojunction photocatalyst, oxygen vacancies are introduced to broaden the light absorption range of the catalyst, a sandwich structure is constructed to increase space conduction and separation of photon-generated carriers, the Z-type heterojunction improves the ability of the photocatalyst to generate strong oxidizing species, and the photocatalytic activity of the photocatalyst is improved. Therefore, the activity and stability of the photocatalyst are stimulated in multiple aspects, and tetracycline or other types of pollutants in water are effectively removed.

Description

technical field [0001] The invention belongs to the field of photocatalytic water treatment, and in particular relates to a preparation method of a defective titanium dioxide / ultra-thin carbon nitride / defective titanium dioxide Z-type heterojunction photocatalyst, which can more efficiently remove tetracycline in water. Background technique [0002] Antibiotics have played an important role in safeguarding human health for decades. Among them, tetracyclines are of great significance because of their wide application. However, excessive antibiotics entering the environment will cause a series of harms, such as destroying the ecological balance, threatening the human body, and seriously disturbing the ecosystem. Therefore, a lot of research has been done to solve this problem. Among them, visible light photocatalysis is considered as a promising method. [0003] TiO 2 As a traditional photocatalyst, it has been proved to have good engineering application value. However, i...

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Problems solved by technology

[0005] The present invention aims at the deficiency of existing photocatalysts, in order to more effectively remove tetracycline or other pollutants in water, and provides a method for preparing a defect-type titanium dioxide / ultra-thin carbon nitride / defect-type titanium dioxide Z-type heterojunction photocatalyst, In this method, TiO containing oxygen vacancies 2 Nanoparticles distributed in the ultrathin g-C 3 N 4 On both sides, a sandwich-like three-dimensional structure can be formed, which can effectively shorten the transport path of the carrier and provide more reaction sites, thereby improving the photocatalytic performance of the photocatalyst and more effectively removing tetracycline from water.

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