Novel zero-dimensional ZnSe-two-dimensional SnSe heterojunction catalyst and preparation and application thereof

Abstract

The invention relates to a novel zero-dimensional ZnSe-two-dimensional SnSe heterojunction catalyst as well as preparation and application of the novel zero-dimensional ZnSe-two-dimensional SnSe heterojunction catalyst. The method comprises the following steps: mixing SnCl2, SeO2, oleamide, hydrazine hydrate and water to form a precursor solution, and putting the precursor solution into a hydrothermal reaction kettle for hydrothermal reaction to obtain two-dimensional nano-sheet SnSe; the preparation method comprises the following steps: mixing two-dimensional nano-sheet SnSe, ZnNO3. 6H2O, SeO2, sodium hexadecyl benzene sulfonate, hydrazine hydrate and water to obtain a precursor solution, putting the precursor solution into a hydrothermal reaction kettle, and carrying out secondary hydrothermal reaction to obtain the zero-dimensional ZnSe-two-dimensional SnSe heterojunction catalyst. The photocatalytic degradation performance of the zero-dimensional ZnSe-two-dimensional SnSe heterojunction catalyst prepared by the preparation scheme is obviously enhanced, and the degradation rates of the zero-dimensional ZnSe-two-dimensional SnSe heterojunction catalyst for photocatalytic degradation of methylene blue and levofloxacin are 3.8 times and 1.7 times of those of a single SnSe product respectively. The method is simple in process, easy to control and high in production efficiency.

Description

technical field [0001] The invention relates to a novel zero-dimensional ZnSe-two-dimensional SnSe heterojunction catalyst and its preparation and application. Background technique [0002] SnSe is a new type of photoelectric material, and it has been reported that two-dimensional nanosheet SnSe materials can be obtained by hydrothermal synthesis. This two-dimensional nanosheet SnSe material is suitable for building composite materials with nanoparticle, rod, and sheet materials. ZnSe is a zero-dimensional nanoparticle material with a large specific surface area and exhibits certain photoelectric conversion and catalytic properties. Studies have shown that constructing catalysts with heterojunction structures can improve the catalytic activity of traditional single catalyst materials. There is no report of obtaining a zero-dimensional ZnSe-two-dimensional SnSe heterojunction catalyst. The applicant found that the zero-dimensional nano-particle ZnSe single material has a la...

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Problems solved by technology

There is no report of obtaining a zero-dimensional ZnSe-two-dimensional SnSe heterojunction catalyst. The applicant found that the zero-dimensional nano-particle ZnSe single material has a large band gap (2.7eV), high internal resistance, and internal carrier The separation and transmission efficiency is not high. If it can be combined with the two-dimensional narrow-bandgap semiconductor SnSe, it is expected to obtain a zero-dimensional ZnSe-two-dimensional SnSe heterojunction catalyst with enhanced performance.

However, the synthesis conditions of zero-dimensional nano-particle ZnSe and two-dimensional nano-sheet SnSe are quite different, and it is difficult to obtain composites compatible with these two nanomaterials. Therefore, the present invention provides a mature and reliable method to prepare zero-dimensional ZnSe- Two-dimensional SnSe heterojunction catalyst and its application in photocatalytic degradation of dyes (methylene blue) and antibiotics (levofloxacin)

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