Composite photo-thermal evaporator based on molybdenum trioxide hydride, preparation method and application

By constructing a hydrophobic photothermal layer/hydrophilic water-transporting layer structure of hydrogenated molybdenum trioxide and polyvinyl alcohol foam, the problems of photothermal material shedding and process complexity are solved, achieving efficient photothermal conversion and stability, which is suitable for seawater desalination and industrial wastewater treatment.

CN122126916AActive Publication Date: 2026-06-02UNIV OF SCI & TECH OF CHINA
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Patent Information

Application Number
CN202610595543.5
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2026-04-30
Publication Date
2026-06-02
Estimated Expiration
2046-04-30

AI Technical Summary

Technical Problem

Existing photothermal evaporators suffer from weak adhesion between the photothermal material and the substrate during long-term water flow scouring and evaporation cycles, leading to detachment. Furthermore, adhesives increase process complexity and clog water molecule transport channels, reducing evaporation efficiency.

Method used

Janus asymmetric structure, which uses hydrogenated molybdenum trioxide and polyvinyl alcohol foam to construct a hydrophobic photothermal layer/hydrophilic water transport layer, is used to stabilize the photothermal material in situ through the chelation reaction of metal ions and chitosan. Combined with hydrophobic treatment, it achieves efficient photothermal conversion and anti-salt blockage performance.

Benefits of technology

It achieves efficient photothermal conversion, excellent anti-salt clogging performance and superior structural stability, and is suitable for solar-driven seawater desalination and saline industrial wastewater treatment, with simplified process and environmental advantages.

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Abstract

The invention discloses a composite photo-thermal evaporator based on molybdenum trioxide hydride, a preparation method and application, and relates to the technical field of clean energy and water resource utilization. The preparation method comprises the following steps: carrying out hydrogenation reduction reaction on molybdenum trioxide powder and low-work-function metal particles in a hydrochloric acid solution to obtain hydrogenated molybdenum trioxide powder and filtrate containing metal ions; dispersing molybdenum trioxide hydride powder in the filtrate to obtain a composite dispersion liquid; partially immersing the to-be-loaded end of the polyvinyl alcohol foam base material into the chitosan solution for preloading; immersing a pre-loaded area into the composite dispersion liquid, so that chitosan and metal ions in filtrate are subjected to an in-situ chelation reaction, and molybdenum trioxide hydride particles are synchronously fixed; and finally, local hydrophobic treatment is conducted on the load area, and the composite photo-thermal evaporator comprising the hydrophobic photo-thermal layer and the hydrophilic water conveying layer is obtained. The evaporator can be used for solar seawater desalination, high-salinity wastewater treatment or clean water production.
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