Silver iodide nanoparticles modified bismuth oxybromide composite photocatalyst and its preparation method and application

Abstract

The invention discloses a silver iodide nanoparticle-modified bismuth oxybromide composite photocatalyst and its preparation method and application. The composite photocatalyst uses bismuth oxybromide as a carrier, and the bismuth oxybromide is modified with silver iodide nanoparticles. The preparation method includes the following steps: dispersing bismuth oxybromide in water, adding silver nitrate solution and potassium iodide to perform a co-precipitation reaction, and obtaining a silver iodide nanoparticle-modified bismuth oxybromide composite photocatalyst. The composite photocatalyst of the present invention has the advantages of green environmental protection, high photogenerated electron-hole separation efficiency, high light absorption efficiency, strong photocatalytic redox ability, good photocatalytic performance stability, and good reusability, and its preparation method has the following preparation process It has the advantages of simplicity, easy control of operating conditions, easy availability of raw materials, and low preparation cost. The composite photocatalyst of the present invention can be used to degrade antibiotic wastewater, has the advantages of simple application method, high degradation efficiency, good reusability, and has good practical application prospects.

Description

technical field [0001] The invention belongs to the technical field of photocatalysis, and relates to a bismuth oxybromide composite photocatalyst and its preparation method and application, in particular to a silver iodide nanoparticle-modified bismuth oxybromide composite photocatalyst, its preparation method and application. Background technique [0002] Due to its low cost, no pollution and high efficiency, photocatalytic technology has broad application prospects in energy storage, conversion and environmental protection. [0003] Bismuth oxybromide (BiOBr) is a photocatalytic material with visible light response, which is widely used in photocatalysis due to its suitable band gap, relatively high photostability, unique crystal structure and green and non-toxic properties. Fields, such as photocatalytic water splitting, selective photoorganic synthesis, and purification of organic pollutants in air or water. However, bismuth oxybromide has disadvantages such as low lig...

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Problems solved by technology

However, these traditional modification methods usually cannot improve the conduction band position of bismuth oxybromide, because the photogenerated electrons of the bismuth oxybromide photocatalyst cannot convert oxygen (O 2 ) into superoxide radicals (·O 2 - ), thus severely limiting the photocatalytic performance of the modified bismuth oxybromide photocatalyst

Therefore, how to comprehensively improve the problems of bismuth oxybromide photogenerated electron-hole pair recombination rate, low light absorption efficiency, low conduction band position, poor photocatalytic activity, and poor stability of photocatalytic performance are technical problems that need to be solved urgently in this field.

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