Preparation method and application of a sandwich-type solar-driven interface evaporator

By preparing a sandwich-type solar-driven interfacial evaporator and utilizing hydrothermal and electrospinning technologies, the problem of decreased evaporation efficiency caused by salt accumulation was solved, efficient seawater desalination and photothermal conversion were achieved, and drinking water quality requirements were met.

CN119192660BActive Publication Date: 2025-09-26WUHAN TEXTILE UNIV
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Patent Information

Application Number
CN202411329622.9
Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Filing Date
2024-09-24
Publication Date
2025-09-26
Estimated Expiration
2044-09-24

AI Technical Summary

Technical Problem

After long-term use, the existing solar-driven interfacial evaporator will lose capillary force, resulting in salt accumulation and reduced evaporation effect, making it difficult to effectively desalinate seawater.

Method used

A sandwich-structured solar-driven interfacial evaporator was used to prepare molybdenum disulfide nanoflowers by a hydrothermal method, and polyimide aerogel was prepared by combining electrospinning. Polyvinyl pyrrolidone was used as a binder to form a coating with excellent photothermal conversion performance and salt resistance.

Benefits of technology

It achieves efficient photothermal conversion and salt resistance, maintains a good evaporation rate and photothermal conversion efficiency, can effectively desalinate seawater, significantly reduce ion concentration, and meet drinking water standards.

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Abstract

The present invention relates to a preparation method and application of a sandwich-type solar-driven interface evaporator, and belongs to the technical field of polymer materials. The present invention constructs a sandwich-type wetting gradient aerogel with hydrophilic-hydrophobic-hydrophilic properties, and sprays molybdenum disulfide, a two-dimensional material with high photothermal conversion effect, on the upper surface of the porous electrospun polyimide aerogel, and performs a hydrophilic treatment on the bottom surface of the super-hydrophobic three-dimensional polyimide aerogel, which is beneficial to the supply and transmission of water. Thanks to this reasonable design, the evaporator has excellent photothermal conversion efficiency, which can reach 98.8% under one sunlight intensity. The prepared sandwich-type solar-driven interface evaporator is applied to the field of seawater desalination. Its good cycle stability, salt resistance and structural stability provide a new way for solar-driven efficient and stable acquisition of fresh water.
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