Preprint Article Version 1 Preserved in Portico This version is not peer-reviewed

Fabrication of Loose Nanofiltration Membrane by Crosslinking TEMPO-Oxidized Cellulose Nanofibers for Effective Dye/Salt Separation

Shasha Liu
ORCID logo ,
Mei Sun
,
Can Wu
,
Kaixuan Zhu
,
Ying Hu
,
Meng Shan
,
Meng Wang
,
Kai Wu
,
Jingyi Wu
,
Zongli Xie
* ORCID logo ,
Hai Tang
*
Version 1 : Received: 17 April 2024 / Approved: 17 April 2024 / Online: 17 April 2024 (13:22:36 CEST)

How to cite: Liu, S.; Sun, M.; Wu, C.; Zhu, K.; Hu, Y.; Shan, M.; Wang, M.; Wu, K.; Wu, J.; Xie, Z.; Tang, H. Fabrication of Loose Nanofiltration Membrane by Crosslinking TEMPO-Oxidized Cellulose Nanofibers for Effective Dye/Salt Separation. Preprints 2024, 2024041160. https://doi.org/10.20944/preprints202404.1160.v1 Liu, S.; Sun, M.; Wu, C.; Zhu, K.; Hu, Y.; Shan, M.; Wang, M.; Wu, K.; Wu, J.; Xie, Z.; Tang, H. Fabrication of Loose Nanofiltration Membrane by Crosslinking TEMPO-Oxidized Cellulose Nanofibers for Effective Dye/Salt Separation. Preprints 2024, 2024041160. https://doi.org/10.20944/preprints202404.1160.v1

Abstract

Dye/salt separation has gained increasing attention in recent years, prompting the quest for cost-effective and environmentally-friendly raw materials for synthesis high performance nanofiltration (NF) membrane for effective dye/salt separation. Herein, a high-performance loose structured NF membrane was fabricated by via a simple vacuum filtration method using a green nanomaterial, 2,2,6,6-tetramethylpiperidine-1-oxide radical (TEMPO)-oxidized cellulose nanofiber (TOCNF), by sequentially filtrating larger-size and finer-size TOCNFs on a microporous substrate, followed by cross-linked with trimesoyl chloride. The resultant TCM membrane possesses a separating layer composed entirely of pure TOCNF, eliminating the need for other polymer or nanomaterials additives. TCM membranes exhibits high performance and effective dye/salt selectivity. Scanning Electron Microscope (SEM) analysis shows that the TCM membrane with Fine-TOCNF layer has a tight layered structure. Further characterizations via Fourier transform infrared spectroscopy (FTIR) and X-ray diffraction (XRD) confirm the presence of functional groups and chemical bonds of the crosslinked membrane. Notably, the optimized TCM-5 membrane exhibits a rejection rate of over 99% for various dyes (Congo red, orange yellow) and 14.2% for NaCl, showcasing a potential candidate for efficient dye wastewater treatment.

Keywords

Tempo-oxidized cellulose nanofibers; Nanofiltration membrane; Dye/salt separation

Subject

Chemistry and Materials Science, Surfaces, Coatings and Films

Copyright: This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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