Titanium dioxide-based photocatalytic nanofiber membrane, preparation method and application thereof in printing and dyeing wastewater treatment

By preparing titanium dioxide-based photocatalytic nanofiber membranes, and utilizing the composite method of silver acetate and zirconium oxide and electrospinning technology, a hierarchical porous structure was formed and silver nanoparticles were precipitated. This solved the problems of narrow light response range and easy recombination of photogenerated electron-hole pairs in practical applications of TiO2 photocatalytic nanofilms, and achieved highly efficient visible light catalysis and water evaporation performance.

CN122124645APending Publication Date: 2026-06-02NANTONG UNIV
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
NANTONG UNIV
Filing Date
2026-03-18
Publication Date
2026-06-02

AI Technical Summary

Technical Problem

Existing TiO2 photocatalytic nanofilms suffer from narrow light response range, easy recombination of photogenerated electron-hole pairs, low contact efficiency between dye molecules and catalyst, and large mass transfer resistance in membrane structure, making it difficult to improve degradation efficiency in practical applications.

Method used

Titanium dioxide-based photocatalytic nanofiber membranes were prepared using a composite method of silver acetate, polyvinylpyrrolidone, and zirconium oxide. A hierarchical porous structure was formed through electrospinning and calcination, and silver nanoparticles were precipitated under light irradiation to construct a metal-semiconductor heterojunction, thereby enhancing light absorption and photothermal conversion capabilities.

Benefits of technology

It broadens the spectral response range, improves photocatalytic degradation efficiency, enhances the corrosion resistance and toughness of the membrane, achieves highly efficient visible light photocatalytic degradation and water evaporation performance, and also has antibacterial properties.

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Abstract

This invention belongs to the field of inorganic metal oxides, and relates to a titanium dioxide-based photocatalytic nanofiber membrane, its preparation method, and its application in the treatment of dyeing and printing wastewater. The method uses a metal complex precursor and a polyvinylpyrrolidone / polyethylene oxide dual polymer template, which are sequentially prepared through electrospinning, programmed temperature calcination, and photoreduction treatment. A multi-level porous structure is constructed within the fibers through the pyrolysis and volatilization of PVP and PEO; the mechanical properties and acid and alkali corrosion resistance of the membrane are significantly improved through zirconium oxide lattice doping; the uniform dispersion of silver ions is achieved through polymer coordination, and the reduction of silver nanoparticles is achieved by photogenerated electrons generated by TiO2 under light irradiation. The resulting nanofiber membrane achieves a viscosity of 2.35 kg·m³ under simulated sunlight. ‑2 ·h ‑1 The interfacial water evaporation rate is high, and the photocatalytic degradation rate of methylene blue reaches 99.1% after 2 hours of light irradiation, making it suitable for the simultaneous purification of dyeing and printing wastewater and freshwater extraction.
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