Abstract
Numerous oil/water mixtures are produced by industrial processes and residential activities, leading to the need for effective separation technologies for wastewater treatment and environmental remediation. In the present study, we report a cellulose-based nanofiber membrane with exceptional hydrophilicity and oleophobicity that rejects organic solvents and allows the penetration of water, thus avoiding fouling by organic residues, which has been a serious issue for conventional oil/water separation membranes. The cellulose-based nanofiber membrane was fabricated through the electrospinning of cellulose acetate and subsequent deacetylation. The resulting surface hydroxyl groups were utilized to bind with the zwitterionic copolymer poly(sulfobetaine methacrylate-r-glycidyl methacrylate) via a ring-opening reaction with the epoxy groups in the copolymer. The resulting copolymer-grafted cellulose nanofiber membrane allowed the highly selective penetration of the water phase from three different oil/water mixtures. The average filtration efficiency was higher than 98% with outstanding reusability and stability over at least 20 cycles following decontamination by washing the membrane with water. The proposed material platform expands the potential use of cellulose materials to a wide range of applications in which hydrophilic coating is required.
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Acknowledgments
We are grateful for support of National Research Foundation of Korea (NRF) (Grant No. 2021R1A2C1093999 and 2022R1F1A1074129) and Korea Institute of Industrial Technology (KITECH).
Funding
This work was supported by National Research Foundation of Korea (NRF) (Grant No. 2021R1A2C1093999 and 2022R1F1A1074129) and Korea Institute of Industrial Technology (KITECH).
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DS and SK contributed equally to this work. DS, SK, and DK conducted the experiments and wrote the manuscript. JK synthesized the poly(SBMA-r-GMA), and investigated the XPS results. SR and YL conducted the spectroscopic analysis. MK and HL conceived, planned, and oversaw the study. All authors have given approval to the final version of the manuscript.
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Son, D., Kim, S., Kim, J. et al. Surface grafting of a zwitterionic copolymer onto a cellulose nanofiber membrane for oil/water separation. Cellulose 30, 9635–9645 (2023). https://doi.org/10.1007/s10570-023-05475-3
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DOI: https://doi.org/10.1007/s10570-023-05475-3