Abstract
Membrane fouling is always the biggest problem in the practice of membrane separation technologies, which strongly impacts their applicability, separation efficiency, cost effectiveness, and service lifespan. Herein, a simple but effective 3D modification approach was designed for permanently functionalizing polymeric membranes by directly cross-linking polyvinyl alcohol (PVA) under gamma-ray irradiation at room temperature without any additives. After the modification, a PVA layer was constructed on the membrane surface and the pore inner surface of polyvinylidene fluoride (PVDF) membranes. This endowed them with good hydrophilicity, low adsorption of protein model foulants, and easy recoverability properties. In addition, the pore size and distribution were customized by controlling the PVA concentration, which enhanced the rejection ability of the resultant membranes and converted them from microfiltration to ultrafiltration. The cross-linked PVA layer was equipped with the resultant membranes with good resistance to chemical cleaning by acidic, alkaline, and oxidative reagents, which could greatly prolong the membrane service lifetime. Furthermore, this approach was demonstrated as a universal method to modify PVDF membranes with other hydrophilic macromolecular modifiers, including polyethylene glycol, sodium alginate, and polyvinyl pyrrolidone. This modification of the membranes effectively endowed them with good hydrophilicity and antifouling properties, as expected.
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Acknowledgements
The authors would like to thank Prof. Wan-Zhong Lang and his group from Shanghai Normal University for their enthusiastic help and support for the characterization of membranes, and they also have pleasure in acknowledging the support from the Shanghai Engineering Research Centre of Green Energy Chemical Engineering.
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All authors contributed to the study conception and design. Material preparation, data collection and analysis were performed by Yu Gu and Bo-Wu Zhang. The first draft of the manuscript was written by Yu Gu and all authors commented on previous versions of the manuscript. All authors read and approved the final manuscript.
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This work was supported by the National Natural Science Foundation of China (Nos. 11875313, 12075153, and 11575277).
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Gu, Y., Zhang, BW., Guo, Z. et al. Radiation-induced cross-linking: a novel avenue to permanent 3D modification of polymeric membranes. NUCL SCI TECH 32, 70 (2021). https://doi.org/10.1007/s41365-021-00905-y
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DOI: https://doi.org/10.1007/s41365-021-00905-y