TY - JOUR
T1 - Surface modification of thin-film composite forward osmosis membranes with polyvinyl alcohol–graphene oxide composite hydrogels for antifouling properties
AU - Akther, Nawshad
AU - Ali, Syed Muztuza
AU - Phuntsho, Sherub
AU - Shon, Hokyong
N1 - KAUST Repository Item: Exported on 2021-03-11
Acknowledged KAUST grant number(s): CRG2017, URF/1/3404-01
Acknowledgements: The research reported in this paper was supported by the ARC Industrial Transformation Research Hub (IH170100009) and the King Abdullah University of Science and Technology (KAUST), Saudi Arabia through the Competitive Research Grant Program – CRG2017 (CRG6), Grant # URF/1/3404-01.
This publication acknowledges KAUST support, but has no KAUST affiliated authors.
PY - 2020/10
Y1 - 2020/10
N2 - In this study, the polyamide (PA) layers of commercial thin-film composite (TFC) forward osmosis (FO) membranes were coated with glutaraldehyde cross-linked polyvinyl alcohol (PVA) hydrogel comprising of graphene oxide (GO) at various loadings to enhance their fouling resistance. The optimal GO concentration of 0.02 wt% in hydrogel solution was confirmed from the FO membrane performance, and its influence on membrane antifouling properties was studied. The properties of the modified membranes, such as surface morphology, surface charge and wettability, were also investigated. PVA/GO coating was observed to increase the smoothness and hydrophilicity of the membrane surface. The foulant resistances of the pristine, PVA-coated and PVA/GO-coated membranes were also reported. PVA hydrogel-coated TFC membrane with a GO loading of 0.02 wt% showed a 55% reduction in specific reverse solute flux, only a marginal reduction in the water flux, and the best antifouling property with a 58% higher flux recovery than the pristine TFC membrane. The significant improvement in the selectivity of the modified membranes meant that the hydrogel coating could be used to seal PA defects. The biocidal GO flakes in PVA hydrogel coating also improved the biofouling resistance of the modified membranes, which could be attributed to their morphologies and superior surface properties.
AB - In this study, the polyamide (PA) layers of commercial thin-film composite (TFC) forward osmosis (FO) membranes were coated with glutaraldehyde cross-linked polyvinyl alcohol (PVA) hydrogel comprising of graphene oxide (GO) at various loadings to enhance their fouling resistance. The optimal GO concentration of 0.02 wt% in hydrogel solution was confirmed from the FO membrane performance, and its influence on membrane antifouling properties was studied. The properties of the modified membranes, such as surface morphology, surface charge and wettability, were also investigated. PVA/GO coating was observed to increase the smoothness and hydrophilicity of the membrane surface. The foulant resistances of the pristine, PVA-coated and PVA/GO-coated membranes were also reported. PVA hydrogel-coated TFC membrane with a GO loading of 0.02 wt% showed a 55% reduction in specific reverse solute flux, only a marginal reduction in the water flux, and the best antifouling property with a 58% higher flux recovery than the pristine TFC membrane. The significant improvement in the selectivity of the modified membranes meant that the hydrogel coating could be used to seal PA defects. The biocidal GO flakes in PVA hydrogel coating also improved the biofouling resistance of the modified membranes, which could be attributed to their morphologies and superior surface properties.
UR - http://hdl.handle.net/10754/667364
UR - https://linkinghub.elsevier.com/retrieve/pii/S0011916420308602
UR - http://www.scopus.com/inward/record.url?scp=85086411179&partnerID=8YFLogxK
U2 - 10.1016/j.desal.2020.114591
DO - 10.1016/j.desal.2020.114591
M3 - Article
SN - 0011-9164
VL - 491
SP - 114591
JO - Desalination
JF - Desalination
ER -