Graphene titanium dioxide composite nano material and preparation method thereof

Abstract

The invention discloses a graphene titanium dioxide composite nano material and a preparation method thereof. The preparation method of the graphene titanium dioxide composite nano material includes the steps of: dissolving graphite oxide prepared by a Hummers method in an acetone solution, and conducting ultrasonic dispersion to prepare graphene oxide suspension A; adding a titanate compound to an alcohol solution, and stirring at room temperature to prepare a titanium dioxide precursor solution B; adding the titanium dioxide precursor solution B into the graphene oxide suspension A to be evenly mixed and stand still, and performing centrifugal separation of precipitates to obtain the precipitates; adding deionized water to the precipitates, and cooling to room temperature after hydrothermal reaction is over to obtain reaction liquid C; separating products from the reaction liquid C by centrifugation, carrying out ultrasonic dispersion, washing, conducting separation and precipitation, and drying the precipitates to obtain the graphene titanium dioxide composite nano material. The preparation method of the graphene titanium dioxide composite nano material has the advantages of being simple, suitable for large-scale production, and capable of performing one-step synthesis of the graphene titanium dioxide nano composite material with high specific surface and good photocatalyticproperties by a hydrothermal method under mild conditions.

Description

technical field [0001] The invention belongs to the field of nanomaterials, and relates to a graphene-titanium dioxide composite nanomaterial and a preparation method thereof. Background technique [0002] Titanium dioxide semiconductor materials are widely used in solar energy conversion and pollutant treatment due to their high oxidation ability, non-toxicity, stable chemical properties and reusable properties, and have great applications in the field of photocatalysis. It has a good effect on the degradation of organic dyes. However, the high photogenerated electron-hole recombination rate greatly reduces its photocatalytic activity and degradation efficiency. To solve this problem, people have done a lot of work, and one of the main ways is to combine with other semiconductor materials or carbon materials. [0003] As a new type of two-dimensional structured carbon material, graphene has excellent electrical, thermal and mechanical properties, and has been widely studi...

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Problems solved by technology

[0004] At present, there are many reports on the preparation of graphene-titanium dioxide nanocomposites, and the preparation methods are diverse, but most of these methods rely on the complex control of reaction conditions (for example, high-temperature roasting under protective atmosphere, the addition of acid and alkali solutions and toxic additives, and Operation and control under complex conditions such as light-proof environment), and it is difficult to apply catalytic degradation of organic pollutants and large-scale production in practice

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