A double-network hydrogel evaporator for interfacial water evaporation, preparation method and application

By employing a dual-network hydrogel design, combining PVA and AMPS networks with Ti4O7 material, the structural stability and evaporation efficiency of hydrogel evaporators in high-salt and high-radiation environments were solved, enabling efficient seawater desalination applications.

CN122501951APending Publication Date: 2026-08-04SHAANXI UNIV OF SCI & TECH
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Patent Information

Application Number
CN202610755526.3
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2026-05-28
Publication Date
2026-08-04

AI Technical Summary

Technical Problem

Existing hydrogel-based evaporators lack structural stability and mechanical strength under high evaporation rates, making it difficult to maintain long-term operational reliability in environments with high salt concentrations and high solar radiation.

Method used

A dual-network hydrogel design is adopted, with the first network being a polyvinyl alcohol (PVA) network and the second network being a 2-acrylamide-2-methylpropanesulfonic acid (AMPS) network. Combined with a multi-level porous structure and the photothermal absorbing material Ti4O7, the structural stability and evaporation efficiency are enhanced through a sacrificial bond breaking-continuous network bearing mechanism.

Benefits of technology

It significantly improves the mechanical stability and evaporation efficiency of hydrogel evaporators, maintains structural integrity under high salinity and high radiation conditions, enhances evaporation rate and salt resistance, and is suitable for seawater desalination.

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Abstract

The present application relates to the technical field of seawater desalination material preparation, and particularly relates to a double-network hydrogel evaporator for interfacial water evaporation, a preparation method and application, comprising a polyvinyl alcohol first network and a 2-acrylamide-2-methylpropanesulfonic acid second network which penetrate each other, and Ti4O7 photo-thermal absorption material is dispersed in the first network; the evaporator has a macroporous skeleton formed by the first network and a multistage pore composed of nanoscale fibrous and membranous secondary structures derived from the second network on the macroporous skeleton, the mechanical stability is improved through a double-network synergistic enhancement mechanism, the multistage pore structure is used to accelerate water transmission and increase the evaporation interface, so that the evaporator has a high evaporation rate, excellent salt resistance and long-term operation stability, and is more suitable for solar-driven seawater desalination, and solves the problems of weak mechanical strength, poor structural stability and poor environmental adaptability of the hydrogel-based evaporator in the prior art.
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