Preparation method of bismuth oxychloride@bismuth oxybromide composite ultrathin nanosheet of three-dimensional structure

Abstract

The invention discloses a preparation method of a bismuth oxychloride@bismuth oxybromide composite ultrathin nanosheet of a three-dimensional structure, and belongs to the technical field of synthesisof photocatalytic materials. The preparation method is characterized by comprising the steps that bismuth nitrate pentahydrate and sodium dodecyl benzene sulfonate are dissolved in a mannitol solution, stirring is conducted at room temperature until bismuth nitrate pentahydrate and sodium dodecyl benzene sulfonate are completely dissolved, a saturated sodium chloride solution is slowly added to the solution above, stirring continues to obtain a white turbid solution, the obtained solution is transferred into a hydrothermal reaction kettle for a reaction to prepare ultrathin bismuth oxychloride nanosheet products, the ultrathin bismuth oxychloride three-dimensional nanosheets are taken and dispersed in a saturated potassium bromide solution, and the bismuth oxychloride / bismuth oxybromide composite ultrathin nanosheet of the three-dimensional structure is formed through high-temperature ion exchange. The preparation method has the advantages that the operation process is simple and easyto implement, and the synthesized oxychloride / bismuth oxybromide composite material has a three-dimensional structure formed by self-assembly of the ultrathin two-dimensional nanosheets and is largein specific surface area and stable in structure.

Description

technical field [0001] The invention belongs to the technical field of preparation of photocatalytic materials, and specifically relates to a method for synthesizing three-dimensional structure bismuth oxychloride by a solvothermal method, and preparing a three-dimensional structure bismuth oxychloride@bismuth oxybromide composite ultra-thin nanosheet by an ion exchange method. Background technique [0002] In recent years, environmental pollution and energy shortage are major challenges facing mankind. Photocatalytic technology can directly use solar energy as light to drive deep reaction at room temperature, so it has broad development prospects in environmental purification and new energy development. Using semiconductor oxides as catalysts to convert light energy into electrical energy and chemical energy provides us with an ideal method for energy utilization and environmental pollution control. However, the main problems in the research of semiconductor photocatalysts...

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Problems solved by technology

In addition, the two-dimensional ultra-thin structure makes the photocatalytic material have a higher specific surface area and more unsaturated surface atoms, and the exposed atoms on the surface are easy to escape from the lattice to generate vacancies, which greatly affects the physical and chemical properties of the material. nature

The patent application number CN201210082112.7 discloses a preparation method of porous bismuth oxyiodide nanophotocatalysis, mainly to solve the existing technical problem of poor photodegradation performance of bismuth oxyiodide in the visible light region, but the preparation process of this method is cumbersome And the use of a large amount of organic solvents is not conducive to large-scale production. In addition, the specific surface area of ​​bismuth oxyiodide prepared by this method has not fundamentally changed the photocatalytic performance of bismuth oxyiodide, and the room for improvement is limited.

The patent with the publication number CN101724839A provides a method for preparing BiOCl thin film by vapor deposition and chemical oxidation. The prepared thin film has a flower-like structure, but the preparation process needs to go through a complex physical vapor deposition process, requiring special equipment and High-purity gas is used as shielding gas, the cost is high, and the operation is complicated

The patent with the publication number CN101857382A adopts the continuous ion layer adsorption reaction method to prepare BiOI thin film electrodes, which has potential application in the field of solar cells, but this method needs to be repeated many times to obtain the required thin film, and the operation process is relatively cumbersome

The patent with the publication number N102974373 A discloses a preparation method of a bismuth oxychloride / bismuth oxyiodide heterogeneous visible light photocatalytic material, mainly to provide a material with high catalytic activity and stability, but the preparation of the precursor bismuth oxychloride is time-consuming It is tedious, and the reaction with bismuth oxyiodide in the later stage needs to be calcined, and the formed nanosheets are thicker, which is not conducive to the effective separation of electrons and holes

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