A kind of graphene-based photocatalyst and preparation method thereof

Abstract

The application discloses a graphene-based photocatalyst and a preparation method thereof, belonging to the technical field of photocatalysis. Firstly, the amino-terminated hyperbranched polysiloxane was compounded with copper bismuthate and nickel ferrite to obtain nanocomposite powder; then graphene oxide was placed in silica airgel, and octadecyl trichlorosilane was used to It is modified to obtain a modified airgel; finally, the nanocomposite powder and the modified airgel are compounded to obtain a photocatalyst; After entering the polluted water body, the catalyst can float on the water surface, continuously absorb oil and other pollutants in the water, and carry out photocatalysis through the nano-composite powder loaded on it, so that the pollutants can be decomposed into carbon dioxide and water. The catalyst can effectively reduce the interfacial transport resistance and recombination rate of photogenerated carriers while improving the photocatalytic efficiency. The catalyst is simple in process, easy to recycle, reusable, and very practical.

Description

technical field [0001] The present application relates to the technical field of photocatalysis, in particular to a graphene-based photocatalyst and a preparation method thereof. Background technique [0002] Energy is the material basis for human survival and social development, and the development of human society is inseparable from the promotion of energy. In today's society, traditional fossil energy is still in the leading position in my country's energy structure. As a non-renewable energy, fossil energy continues to The consumption of solar energy will cause human beings to face the problem of resource depletion in the near future. Therefore, the development and utilization of new energy is a top priority for human beings. Among many new energy sources, sunlight has the advantages of being green, environmentally friendly and inexhaustible. get people's attention. [0003] Photocatalysis technology has unique advantages and broad application prospects in the field of n...

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Problems solved by technology

[0005] In order to alleviate the problem of water pollution, people choose to use photoresponsive nanomaterials such as titanium dioxide in the field of water environmental degradation and pollution. Although nanoscale photoresponsive materials have certain effects on degrading water pollution, it is easy to directly place nanomaterials in water. Colloids are formed in water, which is difficult to separate and reuse, and it is easy to cause waste of materials, which limits the application of nano-based photoresponsive materials.

[0006] Graphene oxide is mainly composed of single-layer graphite, which has rich mesoporous structure and large specific surface area, and has a large number of active sites on the surface. Introducing light-responsive nanomaterials on graphene oxide and making it into a photocatalyst can not only Effectively enhance the conductivity of the composite material, promote the transmission rate of photogenerated electrons, and increase the utilization efficiency of photocatalysts for light energy; however, directly compounding photoresponsive nanomaterials with graphene will easily lead to serious material agglomeration and photogenerated current carrying Increased sub-interface transmission resistance and high recombination rate limit its application

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