Nano composite photocatalytic material and method for preparing same

Abstract

The invention relates to a silver doped grapheme-zinc oxide nano composite photocatalytic material and a method for preparing the same and belongs to the technical field of nano composite materials and photocatalysis. Graphite oxide is subjected to ultrasonic dispersion to obtain a dispersion solution of graphene oxide; precursors of silver ions and zinc ions are added in the dispersion solution of the graphene oxide, and the mixture is placed into a reaction kettle to be subjected to hydro-thermal treatment to be prepared into the silver doped grapheme-zinc oxide nano composite photocatalytic material in situ after the pH is regulated to an alkaline condition. Photocatalytic degradation experiments show that the silver doped grapheme-zinc oxide nano composite photocatalytic material prepared through the method has good adsorption and visible light photocatalytic degradation effects on rhodamine B and is an ideal nano composite photocatalytic material.

Description

technical field [0001] The invention relates to a silver-doped graphene-zinc oxide nanocomposite photocatalytic material and a preparation method thereof, in particular to a method for in-situ preparation of a silver-doped graphene-zinc oxide nanocomposite photocatalyst material by a hydrothermal method The method belongs to the technical field of nanocomposite materials and photocatalysis. Background technique [0002] In recent years, the use of photocatalytic technology to degrade dye wastewater has become a research hotspot. Photocatalytic technology has the advantages of non-toxic, harmless, low cost, high activity, easy operation and reusable. At the same time, this technology can effectively destroy many biological structures with stable structures. Compared with traditional water treatment technology, refractory pollutants have obvious advantages. Photocatalytic technology has become an environmental treatment method with important application prospects, whic...

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Problems solved by technology

[0003] Photocatalyst is an important part of photocatalytic technology. Factors such as photocatalyst composition, crystal structure, size and morphology directly affect the photocatalytic effect. There is almost no absorption in the region, so its response to visible light is poor, and the visible light photocatalytic performance cannot be reflected; in recent years, the research on the modification of visible light photocatalysts based on zinc oxide has mainly focused on two aspects: first, through the modification of zinc oxide The doped zinc oxide visible light photocatalytic material is prepared by doping, and the doped components include non-metallic C, N, noble metal Ag, Pt and rare earth ions, etc.; second, the preparation of nanocomposite photocatalytic materials based on zinc oxide, graphene Due to its large specific surface area and excellent electrical and thermal conductivity, the base material is the first choice for the preparation of ZnO nanocomposites. Yuan Liqiu [Journal of Capital Normal University (Natural Science Edition), 2012, 33, 43] used graphene oxide and oxide Zinc is used as raw material, and the solution system uses hydrazine hydrate and ammonia water to prepare graphene-zinc oxide composite material in situ under water bath conditions. The method is simple, but the zinc oxide in the obtained composite material is the added raw material zinc oxide, so in The structure does not have good characteristics, and the paper did not investigate the visible light photocatalytic performance of the composite material; Yuan Wenhui et al. used graphite oxide and zinc sulfate heptahydrate as reactants, first synthesized graphene oxide-zinc oxide at 80 ° C, and then The graphene-zinc oxide composite material was prepared by the exfoliation method at a vacuum of 200°C. The degree of graphene reduction in the obtained composite material was high, and the composite of graphene oxide and graphene was better, but the visible light of the composite material was not investigated. Catalytic performance

[0004] From the above literature research, it can be found that the preparation of silver-doped zinc oxide materials and graphene-zinc oxide composite materials has made some progress, but using graphene oxide, silver acetate and zinc acetate as precursors, in situ under hydrothermal conditions Preparation of silver-doped graphene / zinc oxide nanocomposite photocatalytic materials has not been reported

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