Journal
JOURNAL OF MEMBRANE SCIENCE
Volume 637, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.memsci.2021.119621
Keywords
Cellulose nanocrystals; Cellulose acetate; Dopamine; Composite membrane; Filtration performance
Categories
Funding
- National Natural Science Founda-tion of China [22075189, 51803128, 52073186]
- Strategic Coop-eration between Sichuan University and Yibin City [2019CDYB-30]
- Strategic Project of Zi Gong Science & Technology Bureau [2019CDZG-S15, 2020CDZG-15]
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Coating cellulose nanocrystals with a thin layer of polydopamine significantly enhances the performance of composite membranes, including filtration capacity, antifouling properties, and mechanical strength. PDA@CNCs/CA composite membrane shows broad application prospects in various fields.
A thin layer of polydopamine (PDA) was coated on the surface of cellulose nanocrystals (CNCs) by the self polymerization of dopamine (DA) in water to improve the hydrophilicity and lipophilicity of CNCs. Then, the CNCs coated with PDA (PDA@CNCs) were blended with pore forming agent and cellulose acetate (CA), and the CA composite membrane reinforced by PDA@CNCs (PDA@CNCs/CA) was prepared by solution phase transformation method. The effects of PDA@CNCs content on the filtration performance, antifouling ability and mechanical properties of the composite membrane were studied. The results show that adding a small amount of PDA@CNCs can significantly improve the filtration capacity, antifouling performance and tensile strength of CA membrane. When the content of PDA@CNCs was 4 wt%, the hydraulic permeability, flux recovery ratio and tensile strength of PDA@CNCs/CA composite membrane increased by 33%, 15% and 76%, respectively. Simple DA modification improves the lipophilicity and dispersion of CNCs, enhances the binding force between CNCs filler and CA matrix, and improves the performance of CA composite membrane, thus widen the industrial application of CA materials, and shows a broad application prospect in the field of biological separation membrane and water treatment membrane.
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