Preparation method of photo-thermal water evaporation material

Abstract

The invention relates to a preparation method of a photo-thermal water evaporation material, cotton is used as a carrier, and is sequentially impregnated in a Tris buffer solution with the pH value of 8-8.9, a dopamine hydrochloride aqueous solution, a hydrogen peroxide aqueous solution of copper sulfate and a graphene dispersion solution to prepare cotton with a polydopamine and graphene modified layer, the method is simple, the preparation cost is low, and the preparation method is suitable for industrial production. The prepared material can reduce the heat loss problem of water in the transportation process and improve the photo-thermal conversion rate. Cotton is used as a carrier and is low in cost, environmentally friendly and non-toxic, the cotton has extremely low thermal conductivity and is a hydrophilic material, fibers are of a hollow structure, have a capillary effect and can effectively absorb water, graphene has good thermal conductivity and structural stability, and the photo-thermal conversion efficiency of the material can be improved; the polydopamine has good adsorption performance and photo-thermal characteristics, and connects the cotton and the graphene together, thereby being beneficial to forming a stable composite material, and being particularly suitable for being used in the fields of seawater desalination, sewage treatment and the like.

Description

technical field [0001] The invention relates to the technical field of photothermal materials, in particular to a photothermal material that effectively utilizes solar energy to accelerate water evaporation, which can be applied to seawater desalination, sewage treatment and the like. Background technique [0002] With the development of industry and the deterioration of the environment, the shortage of fresh water resources is becoming more and more serious. As an inexhaustible clean energy, solar energy has attracted extensive research in seawater desalination. Solar-driven water evaporation technology is generally divided into two types, one is to convert solar energy into heat energy to drive the phase change process of water; the other is to convert solar energy into electrical energy to drive water dialysis. Among them, the first is solar thermal technology. In real life, the ability of water to absorb solar energy is limited, and the conversion efficiency of light t...

AI Technical Summary

Problems solved by technology

In the prior art, typical photothermal materials are metal materials, which excite internal free electron gas oscillations through the plasmon resonance effect on the surface of metal particles to form thermal energy. Currently, the most reported materials are gold, silver and palladium. Most of them are gold nanomaterials, but the cost of the above-mentioned precious metal materials is too high, which limits their large-scale use. Other metal materials such as low-cost copper or aluminum have low conversion efficiency.

Another typical photothermal material is a semiconductor, such as copper chalcogenides, or some transition metals and their nitrides, carbides, borides, and sulfides, all of which have spectral selective absorption characteristics, but these materials also have There is a problem of low light-to-heat conversion efficiency

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