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Microbial fabrication of cellulose nanofiber-based ultrafiltration membrane: a sustainable strategy for membrane manufacture

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Abstract

Developing a sustainable separation membrane is imperative due to the growing environmental pollution caused by petrochemical-based polymers. Cellulose-based materials, including bacterial cellulose (BC), have exhibited potential as separation materials. Here, a novel BC membrane (BCM) is in-situ fabricated via microbial fermentation and physical post-treatment. Owing to the randomly assembled BC nanofibers and abundant hydroxyls on their surface, the obtained BCMs possess three-dimensional network structure with strong hydrophilicity. The BCMs properties can be manipulated by adjusting fermentation and drying conditions, satisfying different purposes for practical use. Extending fermentation time from 3 to 10 days, bacteria secret more BC nanofibers and form a denser membrane structure. Freeze-dried BCMs have the most porous structure and exhibit the highest flux (up to 52 L m−2 h−1) and molecular weight cut-off (up to 1000 KDa) under 2 bar. Press-dried BCMs obtain the highest tensile strength (up to 241.16 MPa) and BSA retention (up to 94.44%). Heat-dried BCMs show good prospects in the pressure-driven membrane process considering flux and retention and demonstrate favorable stability and flux recovery ratios (85.51%~96.43%). Modification of BCMs by carboxymethyl cellulose further promotes membrane hydrophilicity but causes denser structures than original BCMs. The present study proposes a sustainable cellulose membrane manufacturing strategy and demonstrates BCMs can be favorable alternatives to petrochemical-based membranes.

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Acknowledgments

The authors gratefully acknowledge the funding support by Key R&D Plan of Shaanxi Province, China (Project No: 2022NY-006).

Funding

This work was supported by Key R&D Plan of Shaanxi Province, China [Project No: 2022NY-006].

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Y.G. and Y.W. contributed equally to this work. Z.L.: Funding acquisition, conceptualization, writing—review & editing. Y.G., Y.W.: Investigation, experiments, data collection and analysis, visualization and writing—original draft. F.J., S.L.: Partial data collection, investigation. S.L., S.S., W.Y.: Formal analysis, writing—review & editing.

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Correspondence to Zhenyu Li.

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Guo, Y., Wang, Y., Jia, F. et al. Microbial fabrication of cellulose nanofiber-based ultrafiltration membrane: a sustainable strategy for membrane manufacture. Cellulose 30, 5001–5017 (2023). https://doi.org/10.1007/s10570-023-05201-z

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  • DOI: https://doi.org/10.1007/s10570-023-05201-z

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