Reusable reduced graphene oxide-based photothermal conversion film and preparation method thereof

Abstract

The invention relates to a reusable reduced graphene oxide-based photothermal conversion film and a preparation method thereof. The method comprises the steps of firstly connecting a graphene oxide sheet by adopting a crosslinking agent under the action of agitation and ultrasound and then carrying out vacuum suction filtration on the mixed dispersion liquid to a mixed cellulose filter film; and quickly reducing the prepared graphene oxide/mixed cellulose film by using a reducing agent under a microwave assist to obtain the reduced graphene oxide-based double-layer photothermal conversion film. A steam performance test shows that the reduced graphene oxide-based double-layer photothermal conversion film achieves 60% of steam conversion efficiency under illumination of 1Kw/m<2>. A cyclic test result shows that the reduced graphene oxide-based double-layer photothermal conversion film still keeps the stable performance after repeated experiments for 30 times. The prepared photothermal conversion film is capable of directly converting solar energy into steam energy, is high in photothermal conversion efficiency, wide in application prospect, simple in preparation technology and low in cost, and has excellent mechanical stability and reusability.

Description

technical field [0001] The invention relates to the field of preparation of nanocomposite materials, in particular to a reusable reduced graphene oxide-based light-to-heat conversion film and a preparation method thereof. Background technique [0002] In the 21st century, troubled by the increasingly serious energy crisis and environmental pollution, solar energy, as a clean and renewable energy source, has attracted more and more attention. The system will help to solve the above problems. The local heat generated by the surface plasmon resonance effect of nanoparticles can efficiently convert solar energy to generate hot steam, which is different from the traditional photothermal conversion that needs to heat the bulk liquid. The local heat energy at the nanoscale minimizes heat conduction losses and achieves high vaporization efficiency. This technology has broad application prospects, such as: rapid water evaporation, desalination of seawater, disinfection of medical e...

AI Technical Summary

Problems solved by technology

[0003] At present, the reported materials that can be used for photothermal vaporization conversion include gold, silver and other precious metal nanofluids and their macroscopic assembly materials, but the expensive price, the nature of easy agglomeration and the fragile stability of the assembly materials limit their practical application. application

In addition to noble metals, inorganic nanomaterials such as titanium nitride, carbon nanotubes, and carbon black also have good light-to-heat conversion capabilities, but most of them are used as dispersions. The hot steam bubbles generated in this system need to pass through the entire solution to rise to The liquid surface is released, which will cause unnecessary heat loss

In addition, there are also a few reports on macroscopic assemblies of these inorganic nanoparticles, but these structures are only connected by physical adsorption and do not have good reusability.

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