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Surface Grafting of Reverse Osmosis Membrane with Chlorhexidine Using Biopolymer Alginate Dialdehyde as a Facile Green Platform for In Situ Biofouling Control
journal contribution
posted on 2020-08-06, 22:20 authored by Rashid Khan, Han Wang, Yufang Li, Shuyan Yu, M. Kamran Khan, Kang Xiao, Xia HuangWe
report a new robust and green facile platform for nonoxidizing chemical
grafting to simultaneously improve antifouling and antibacterial properties
of thin film composite (TFC) polyamide (PA) reverse osmosis (RO) membranes.
In this work, alginate dialdehyde (ADA) was used as a green platform
to graft chlorhexidine (CH), a nonoxidizing chemical, on TFC-RO membrane
surface. A synergistic effect due to ADA and CH grafting was revealed.
The modified membrane surfaces were characterized using XPS, FT-IR,
AFM, SEM-EDS, contact angle, and zeta potential analysis. A simple
two-step Schiff base reaction was performed. Improved salt rejection
performances were observed for the grafted PA membranes at the expense
of negligible flux drop for the CH-ADA-PA membranes (38 to 42 L m–2 h–1) compared with the pristine
PA membrane (45 L m–2 h–1). All
the CH-ADA-PA membranes had excellent antibacterial activity against E. coli along with a highly superior resistance to the formation
of biofilms. Organic fouling behaviors with a protein (bovine serum
albumin, BSA) and a surfactant (dodecyl trimethylammonium bromide,
DTAB) were investigated as typical foulants for the grafted PA membranes.
The results indicated that the CH-ADA-PA membranes showed the best
antifouling performance followed by the ADA-PA membranes, the pristine
membrane being the most inferior. Hence, these results pave the way
for a new robust and green bioinspired route for practical application
in RO membrane fouling control.
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TFC-RO membrane surfaceXPSFT-IRSitu Biofouling ControlCH-ADA-PA membranessalt rejection performancesAFMBiopolymer Alginate Dialdehydenonoxidizing chemicalSchiff base reactionBSAPA membranesdodecyl trimethylammonium bromideDTABRO membrane fouling controlFacile Green PlatformOrganic fouling behaviorsSEM-EDS
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