Preparation method of hierarchical pore structure accelerated solar water evaporation hydrogel

Abstract

The invention provides a preparation method of a hierarchical pore structure accelerated solar water evaporation hydrogel. The preparation method comprises the following steps: (1) firstly, fully mixing graphene oxide (GO) and cysteine in deionized water, and uniformly stirring; then adding a copper chloride (CuCl2) solution dissolved at a certain concentration into a mixed solution of GO and cysteine, finally transferring into a hydrothermal reaction kettle to react for a certain period of time, and finally washing with water; (2) weighing a certain amount of polyvinyl alcohol, and adding thepolyvinyl alcohol into a proper amount of water to prepare a polyvinyl alcohol aqueous solution with a certain concentration; (3) adding the CuS / rGO photo-thermal conversion material prepared in thestep (1), a cross-linking agent and a catalyst into the mixture obtained in the step (2), and uniformly mixing; (4) transferring the precursor obtained in the step (3) into a mold, and carrying out thermocuring molding; and (5) cleaning redundant substances of the hierarchical pore hydrogel obtained in the step (4) with deionized water. Therefore, the hierarchical pore structure accelerated solarwater evaporation hydrogel can be obtained. The novel hydrogel has excellent light absorption capacity, not only can accelerate rapid evaporation of water, but also has excellent mechanical propertiesand water retention rate, and can meet actual production requirements. In addition, the method is simple in process and low in cost and can be put into actual production and application on a large scale.

Description

technical field [0001] The invention relates to the field of functional materials, in particular to a method for preparing a hydrogel with a multi-level porous structure to accelerate solar water evaporation. Background technique [0002] At present, more than one-third of the world's population is short of fresh water resources. With population growth, industrialization and environmental pollution, the current situation of water shortage will be exacerbated. Because the total amount of water is certain, and 97% of the water on the earth is composed of seawater, desalination of seawater is currently the most effective solution. Seawater desalination methods mainly include distillation, reverse osmosis, electrodialysis, and solar distillation. The first three methods all require additional energy consumption to achieve seawater desalination, while the solar distillation method does not consume conventional energy and is pollution-free, which is the general direction of seawa...

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Problems solved by technology

Fu et al. (Applied Thermal Engineering, 2017, 114, 961-968) et al. made the composite material prepared by loading Au on graphene oxide to effectively improve the light-to-heat conversion efficiency, but its cost is high and it is not easy to mass-produce

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