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Issue 3, 2020
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Cellulose nanocrystal/silver (CNC/Ag) thin-film nanocomposite nanofiltration membranes with multifunctional properties

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Abstract

The trade-off between membrane permeability and selectivity and membrane fouling, including both physical and bio-fouling, are major challenges that limit the practical application of nanofiltration (NF) membranes. In order to address these issues simultaneously, multifunctional membranes with maximized water permeability/salt selectivity and enhanced antifouling and antibacterial properties are desired. In this work, we prepare a novel multifunctional thin film nanocomposite (TFN) NF membrane by embedding cellulose nanocrystal/silver (CNC/Ag) nanocomposites into a polyamide layer. The CNC/Ag TFN NF membranes exhibit excellent properties by taking advantage of both CNCs, a highly hydrophilic, low-cost, bio-renewable, and environmentally friendly nanomaterial, and Ag nanoparticles, one of the most effective bactericidal materials. With the incorporation of only 0.01 wt% CNC/Ag nanocomposites, a high pure water permeability (25.4 L m−2 h−1 bar) and a high rejection rate of Na2SO4 (99.1%) of the CNC/Ag TFN NF membrane can be achieved, respectively. Besides, the membrane also exhibits exceptional antifouling (flux recovery ratio reaches 92.6% for humic acid) and antibacterial performance (99.4% reduction of Escherichia coli viability). Ag+ leaching tests also demonstrate the good stability of Ag nanoparticles in the active thin-film layer of the CNC/Ag NF membranes. These findings have strong positive implications for the development of next-generation high performance NF membranes for water treatment.

Graphical abstract: Cellulose nanocrystal/silver (CNC/Ag) thin-film nanocomposite nanofiltration membranes with multifunctional properties

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Supplementary files

Article information


Submitted
30 Nov 2019
Accepted
18 Feb 2020
First published
20 Feb 2020

Environ. Sci.: Nano, 2020,7, 803-816
Article type
Paper

Cellulose nanocrystal/silver (CNC/Ag) thin-film nanocomposite nanofiltration membranes with multifunctional properties

C. Xu, W. Chen, H. Gao, X. Xie and Y. Chen, Environ. Sci.: Nano, 2020, 7, 803
DOI: 10.1039/C9EN01367A

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