Flux self-increasing ZnIn2S4 / PVDF photocatalytic composite membrane as well as preparation method and anti-pollution application of flux self-increasing ZnIn2S4 / PVDF photocatalytic composite membrane

By uniformly dispersing the ZnIn2S4 nanophotocatalyst in the PVDF film, forming the ZnIn2S4/PVDF photocatalytic composite film, the problems of film pollution and flux reduction are solved, and efficient degradation of organic pollutants in water bodies and membrane self-cleaning functions are achieved.

CN119656889APending Publication Date: 2025-03-21SHANGHAI NORMAL UNIVERSITY
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Patent Information

Application Number
CN202411856781.4
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2024-12-17
Publication Date
2025-03-21

AI Technical Summary

Technical Problem

During the application process, existing membrane separation technology is susceptible to problems such as membrane pollution, reduced flux and poor photocatalyst stability, making it difficult to effectively remove organic pollutants in water bodies.

Method used

The ZnIn2S4 nanophotocatalyst was synthesized by hydrothermal method, and it was evenly dispersed into the PVDF film matrix by phase conversion method to form a ZnIn2S4/PVDF photocatalytic composite film, which improved the hydrophilicity, antifouling performance and photocatalytic activity of the film.

Benefits of technology

It realizes self-improvement and stability of water flux, significantly improves the degradation efficiency of organic pollutants in water, extends the service life of the membrane, and has dynamic self-cleaning function.

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Abstract

The invention discloses a flux self-lifting ZnIn2S4 / PVDF (polyvinylidene fluoride) photocatalytic composite membrane as well as a preparation method and anti-pollution application thereof, and the method comprises the following steps: synthesizing a ZnIn2S4 photocatalyst with a nano spherical structure by adopting a hydrothermal method, dispersing the ZnIn2S4 photocatalyst in a PVDF membrane casting solution, and preparing the composite membrane by adopting a phase inversion method. The membrane has an asymmetric spongy communicated pore channel structure, and ZnIn2S4 is uniformly distributed in a membrane matrix, so that the hydrophilicity, antifouling property and photocatalytic degradation capacity of the membrane are remarkably improved. The photocatalytic membrane shows excellent separation and degradation performance on humic acid in a water body under the condition of visible light, the retention rate exceeds 90%, meanwhile, the flux is continuously increased, the flux recovery rate exceeds 100%, and flux reduction caused by pollution and blockage of a traditional photocatalytic composite membrane is effectively avoided. The preparation method is simple to operate and controllable in condition, and the composite membrane has efficient antifouling and self-cleaning performance and is suitable for the fields of drinking water purification, industrial wastewater treatment and other water pollution treatment.
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