Titanium dioxide/graphene composite nanometer photocatalyst, method for preparing same and application of titanium dioxide/graphene composite nanometer photocatalyst

Abstract

The invention discloses a titanium dioxide / graphene composite nanometer photocatalyst, a method for preparing the same and application of the titanium dioxide / graphene composite nanometer photocatalyst. The titanium dioxide / graphene composite nanometer photocatalyst, the method and the application have the advantages that solvothermal processes are adopted, alcohol is used as a solvent, hexamethylene tetramine is decomposed under solvothermal conditions to generate alkaline and reduction species, accordingly, the titanium dioxide / graphene composite nanometer photocatalyst can be prepared at one step, and the problems of secondary stacking of graphene lamellar structures and aggregation of TiO2 nanometer particles in procedures for preparing titanium dioxide and graphene composite materials by the aid of fractional-step methods can be solved; the titanium dioxide / graphene composite nanometer photocatalyst is high in dispersion, has a large specific surface area and is extremely high in photocatalytic degradation capacity for nitrogen-containing organic dyestuff in printing and dyeing wastewater, and accordingly the titanium dioxide / graphene composite nanometer photocatalyst and the method have broad application prospects.

Description

technical field [0001] The invention belongs to the technical field of photocatalyst preparation, and in particular relates to a titanium dioxide / graphene composite nano photocatalyst and its preparation method and application. Background technique [0002] The printing and dyeing industry is a traditional industry in my country. With the rapid development of my country's chemical industry and printing and dyeing industry, while enriching and facilitating people's daily life, the discharge of printing and dyeing wastewater has also caused serious water pollution. At present, reactive dye molecules widely used in cotton, hemp, silk, wool and fiber contain active groups that can covalently interact with hydroxyl, amino or amide groups in fabrics such as cotton, wool and fiber, and the composition is relatively complex. Most of them are based on aromatic hydrocarbons and heterocyclic compounds, with high chroma and COD, poor biological or chemical degradability, coupled with la...

AI Technical Summary

Problems solved by technology

Currently TiO 2 Although semiconductor photocatalytic materials and related photocatalytic degradation technologies have accumulated certain research results and practical applications, there are still many key scientific problems to be solved: 1) TiO 2 Bandgap Width ( E g =3.2 eV) is large, the photoresponse range is narrow, the solar energy utilization rate is low, and only the ultraviolet part can be used; 2) TiO 2 It is a semiconductor material with poor conductivity and high recombination probability of photogenerated electrons and holes, resulting in low utilization efficiency of photogenerated carriers; 3) The specific surface area is relatively low. For a photocatalytic reaction where adsorption is dominant, It is bound to affect the improvement of its catalytic performance; 4) Suspended ultra-fine or nano-sized TiO 2 The photocatalytic performance has been greatly improved, but it is difficult to recycle

However, the extremely high surface energy of the graphene sheet structure makes it easy to undergo secondary stacking between the two-dimensional sheet structures in the application, which seriously affects its performance. Therefore, how to suppress the secondary stacking between the graphene sheet structures Stacking and improving the dispersion between sheet structures is the key to expanding the application of graphene in practical fields

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