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Abstract:
The development of tight ultrafiltration membranes has opened new avenues for the fractionation of organics and inorganic salts from highly saline organic-rich wastewaters, showing great potential as alternatives to nanofiltration membranes for the sustainable recovery of high value-added products. In this work, polypeptide-based antimicrobial tight-ultrafiltration membranes were developed through the interfacial polymerization of ε-polylysine (ε-pl) and trimesoyl chloride (TMC) on porous ultrafiltration substrates for the sustainable management of highly saline textile wastewater. Systematic characterization was conducted to demonstrate the formation of continuous, thin and smooth ε-pl/TMC cross-linked networks. The designed tight ε-pl/TMC composite ultrafiltration membrane with a MWCO of 3185 Da showed exceptional dye/salt fractionation performance in highly saline textile wastewater, achieving >99.80 % rejection for various dyes (0.2 g L−1 direct red 80, reactive black 5 or reactive blue 2) and a <3.35 % salt rejection (20.0 g L−1 NaCl), with favorable water permeation (39.13–44.46 L m−2 h−1·bar−1). In addition, the long-term stability of the polypeptide-based tight ultrafiltration membrane was confirmed to be sufficient for enduring dye/salt separation. Furthermore, the intercalation of ε-polylysine onto the membrane surface strongly enhanced the antibacterial activity (i.e., 99.97 % bacterial inhibition) of the tight ultrafiltration membranes. This competitive performance highlights the potential of tight ε-pl/TMC composite ultrafiltration membranes for the sustainable management of highly saline organic wastewater. © 2025
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Journal of Membrane Science
ISSN: 0376-7388
Year: 2025
Volume: 720
8 . 4 0 0
JCR@2023
Cited Count:
SCOPUS Cited Count: 1
ESI Highly Cited Papers on the List: 0 Unfold All
WanFang Cited Count:
Chinese Cited Count:
30 Days PV: 4
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