Micronano-structured and graphene based composite visible light catalytic material and preparing method thereof

Abstract

The invention relates to the technical field of photocatalysis, in particular to a micro-nano structured graphene-based composite visible light catalytic material and a preparation method thereof. The steps are as follows: dissolve graphene oxide in water, and ultrasonically treat it to obtain a graphene oxide dispersion; ultrasonically disperse silver nitrate and zinc oxide in deionized water to obtain a mixed solution, and add it dropwise to graphene oxide to disperse under stirring conditions. solution to obtain a mixed precursor; slowly add the configured phosphate solution dropwise to the mixed precursor of graphene oxide, silver nitrate and zinc oxide and continue to stir, and transfer the gray-green product obtained by the reaction into a hydrothermal reaction In the kettle, hydrothermal reaction is carried out at a certain temperature, after being cooled to room temperature, centrifuged, washed with deionized water and absolute ethanol respectively, and vacuum-dried to obtain the composite material. The invention has the advantages of simple preparation process, sufficient required raw materials and superior product performance, and exhibits strong degradation activity to the organic dye rhodamine B under excitation of visible light.

Description

technical field [0001] The invention relates to the technical field of photocatalysis, in particular to a graphene-based composite visible light catalytic material with a micro-nano structure and a preparation method thereof, specifically to a rapid preparation of graphene / silver phosphate / zinc oxide with a micro-nano structure by a hydrothermal method The invention discloses a method for compounding visible light catalytic materials, belonging to the fields of composite materials, photocatalytic technology and water pollution control. Background technique [0002] Zinc oxide is a semiconductor material with unique photoelectric properties. It has the advantages of high activity, no pollution, large reserves, and low price, making it widely concerned in the field of photocatalysis. However, due to the large band gap of zinc oxide (3.7 eV), only It can use about 4% of the entire visible spectrum to stimulate the generation of electron-hole pairs; and its energy band structur...

AI Technical Summary

Problems solved by technology

[0004] Graphene is a new material with a single-layer sheet structure composed of carbon atoms. The thickness of a single-layer carbon source not only makes it suitable for the growth of functional nanomaterials, but also has good electronic conductivity. It has been recognized as a catalyst. As an ideal carrier material, graphene oxide is used as a precursor material in the experiment, and the nucleation and growth of silver phosphate are controlled during the reaction process, so that the final zinc oxide / silver phosphate / graphene composite photocatalytic material has a uniform morphology and relatively The small size, high light transmittance and high specific surface area of ​​graphene make the prepared composite photocatalytic material have good dispersibility and adsorption in solution; its high electrical conductivity further accelerates the separation of photogenerated electron pairs , prolong the life of the active components, and enhance the catalytic activity of the composite photocatalytic material. According to the data verification, using commercial zinc oxide, graphene oxide, silver nitrate and phosphate as raw materials, the hydrothermal method is used to rapidly synthesize micro-nano structure The graphene / zinc oxide / silver phosphate composite visible light photocatalytic material and used for photocatalytic degradation of organic pollutants and water purification have not been reported

Images