Tailor-Made Polyamide Membranes for Water Desalination

Title
Tailor-Made Polyamide Membranes for Water Desalination
Authors
최완석구정은Park, Sang-Hee김세영방준하백경열Park, Byoungnam이종석Edwin P. Chan이정현
Keywords
molecular layer-by-layer; polyamide; thin film composite membrane; reverse osmosis; water desalination
Issue Date
2015-01
Publisher
ACS Nano
Citation
VOL 9, NO 1, 345-355
Abstract
Independent control of the extrinsic and intrinsic properties of the polyamide (PA) selective layer is essential for designing thin-film composite (TFC) membranes with performance characteristics required for water purification applications besides seawater desalination. Current commercial TFC membranes fabricated via the well-established interfacial polymerization (IP) approach yield materials that are far from ideal because their layer thickness, surface roughness, polymer chemistry, and network structure cannot be separately tailored. In this work, tailor-made PA-based desalination membranes based on molecular layer-bylayer(mLbL) assembly are presented. The mLbL technique enables the construction of an ultrathin and highly cross-linked PA seletive layer in a precisely and independently controlled manner. The mLbL-assembled TFC membranes exhibit significant enhancements in performance compared to their IP-assembled counterparts. A maximum sodium chloride rejection of 98.2% is achieved along with over 2.5 times higher water flux than the IP-assembled counterpart. More importantly, this work demonstrates the broad applicability of mLbL in fabricating a variety of PA-based TFC membranes with nanoscale control of the selective layer thickness and roughness independent of the specific polyamide chemistry.
URI
http://pubs.kist.re.kr/handle/201004/49533
ISSN
19360851
Appears in Collections:
KIST Publication > Article
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