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 as well as a preparation method and an application thereof. The composite photocatalyst employsbismuth oxybromide as a carrier, and bismuth oxybromide is modified by silver iodide nanoparticles. The preparation method comprises the following steps: bismuth oxybromide is dispersed in water, a silver nitrate solution and potassium iodide are added for carrying out a coprecipitation reaction, in order to obtain the silver iodide nanoparticle modified bismuth oxybromide composite photocatalyst. The composite photocatalyst has the advantages of green and environmental protection, high separation efficiency of photogenerated electron-photogenerated hole, high luminous absorption efficiency,good photocatalysis redox capability, good photocatalytic performance stability, good re-utilizing property, and the like; the preparation method has the advantages of simple preparation technology, easily controlled operation conditions, simply and easily available raw materials, low preparation cost, and the like. The composite photocatalyst can be used for degrading antibiotic waste water, andthe photocatalyst has the advantages of simple application method, high degradation efficiency, good re-utilizing property, and 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...

AI Technical Summary

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.

Images