zhang-dopamineincorporating-2018.pdf (1.48 MB)
Dopamine incorporating forward osmosis membranes with enhanced selectivity and antifouling properties
journal contribution
posted on 2018-01-01, 00:00 authored by Y Wang, Z Fang, Shuaifei ZhaoShuaifei Zhao, D Ng, Jane Zhang, Z XieA new type of polyamide thin-film composite forward osmosis (FO) membranes were prepared by controlling dopamine self-polymerization in the aqueous phase during interfacial polymerization. The as-prepared membranes were investigated by attenuated total reflection Fourier transform infrared, X-ray photoelectron spectroscopy, field-emission scanning electron microscopy, atomic force microscopy and water contact angle measurements. The influence of the dopamine self-polymerization degree with different polydopamine particle sizes on membrane morphologies and chemical properties was studied by regulating dopamine concentrations in the aqueous phase. FO performance of the membrane was evaluated under two different modes, i.e. active layer facing draw solution (AL-DS) and active layer facing feed solution (AL-FS). The optimized FO membranes achieved a doubly enhanced water flux (22.08 L m-2h-1) compared with the control membrane without dopamine incorporation, and a half-reduced reverse salt flux (32.77 mmol m-2h-1) with deionized water as the feed and 1 M NaCl as the draw in the AL-FS mode. The optimized FO membrane showed a significantly reduced structural parameter (176 μm) compared with the control membrane (635 μm), indicating the minimised internal concentration polarization. Moreover, the new FO membranes had less flux decline than the control membrane, suggesting the improved antifouling performance of the membrane. Incorporation of dopamine during interfacial polymerization can be an effective strategy to fabricate high-performance FO membranes with excellent antifouling properties.
History
Journal
RSC advancesVolume
8Issue
40Pagination
22469 - 22481Publisher
Royal Society of ChemistryLocation
Cambridge, Eng.Publisher DOI
Link to full text
eISSN
2046-2069Language
engPublication classification
C1 Refereed article in a scholarly journalCopyright notice
2018, The Royal Society of ChemistryUsage metrics
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forward osmosis (FO) membranesdopamineself-polymerizationaqueous phaseFourierX-ray photoelectron spectroscopyelectron microscopyatomic force microscopyScience & TechnologyPhysical SciencesChemistry, MultidisciplinaryChemistryTHIN-FILM COMPOSITEWASTE-WATER TREATMENTINTERFACIAL POLYMERIZATIONREVERSE-OSMOSISSEPARATION PERFORMANCESURFACE MODIFICATIONACTIVE LAYERFO MEMBRANEPOLYAMIDETFC
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