PVA hydrogel-based photo-thermal evaporation material and preparation and application thereof

Abstract

The invention relates to a PVA hydrogel-based photo-thermal evaporation material and preparation and application thereof. The preparation method comprises the following steps: step 1, respectively preparing an aqueous polyvinyl alcohol (PVA) solution, an aqueous nanometer photo-thermal material dispersion solution, an aqueous glutaraldehyde solution and a low-concentration hydrochloric acid solution; 2, fully mixing and stirring the aqueous PVA solution, the aqueous nanometer photo-thermal material dispersion solution, the aqueous glutaraldehyde solution and the low-concentration hydrochloricacid solution in the step 1 according to a certain sequence under a certain temperature condition; and 3, transferring the mixed and stirred product into a forming mold when the mixed and stirred product is not cured, and carrying out standing until a cross-linking reaction is complete, thereby obtaining the hydrogel material. The preparation method disclosed by the invention has the beneficial effects that preparation process is environment-friendly, pollution-free, simple and feasible; preparation cost is low; the obtained hydrogel can be used as an ideal photo-thermal evaporation and solarseawater desalination material; and the prepared hydrogel has high light absorption efficiency, photo-thermal conversion efficiency and evaporation efficiency, and can be applied to the field of solarseawater desalination.

Description

technical field [0001] The invention relates to the field of hydrogel, photothermal evaporation and its preparation and application, especially including a photothermal evaporation material based on PVA hydrogel and its preparation and application. Background technique [0002] Hydrogel is a three-dimensional network structure formed by the cross-linking of hydrophilic polymer chains, and a special dispersion system in which a large amount of water is filled in the structural voids. Common polymer hydrogels include polyvinyl alcohol (Poly (vinylcohol), PVA), polyacrylamide (Polyacrylamide, PAM), chitosan (Chitosan, CS) and gelatin. Among them, PVA hydrogel has become a kind of polymer hydrogel that has been widely studied because of its high water content, environmental protection, easy degradation, and good biocompatibility. However, the hydrogel composed of a single PVA has low cross-linking degree, uneven internal structure and lack of effective energy dissipation mechan...

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Problems solved by technology

However, although the gel obtained by the chemical cross-linking method has a high water content, its water conductivity is poor. It is necessary to continue to cooperate with the physical cycle freezing-thawing method to expand its porous structure and obtain efficient water-conducting channels.

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