Layer-by-Layer Assembly of Graphene Oxide Nanosheets on Polyamide Membranes for Durable Reverse-Osmosis Applications

Title
Layer-by-Layer Assembly of Graphene Oxide Nanosheets on Polyamide Membranes for Durable Reverse-Osmosis Applications
Authors
최완석최정규방준하이정현
Keywords
Desalination; Reverse Osmosis Membrane; Layer-by-Layer (LbL); Graphene oxide; Polyamide; layer-by-layer assembly; fouling resistance; chlorine resistance
Issue Date
2013-12
Publisher
ACS Applied Materials & Interfaces
Citation
VOL 5, NO 23, 12510-12519
Abstract
Improving membrane durability associated with fouling and chlorine resistance remains one of the major challenges in desalination membrane technology. Here, we demonstrate that attractive features of graphene oxide (GO) nanosheets such as high hydrophilicity, chemical robustness, and ultrafast water permeation can be harnessed for a dual-action barrier coating layer that enhances resistance to both fouling and chlorine-induced degradation of polyamide (PA) thin-film composite (TFC) membranes while preserving their separation performance. GO multilayers were coated on the PA-TFC membrane surfaces via layer-by-layer (LbL) deposition of oppositely charged GO nanosheets. Consequently, it was shown that the conformal GO coating layer can increase the surface hydrophilicity and reduce the surface roughness, leading to the significantly improved antifouling performance against a protein foulant. It was also demonstrated that the chemically inert nature of GO nanosheets enables the GO coating layer to act as a chlorine barrier for the underlying PA membrane, resulting in a profound suppression of the membrane degradation in salt rejection upon chlorine exposure.
URI
http://pubs.kist.re.kr/handle/201004/46963
ISSN
19448244
Appears in Collections:
KIST Publication > Article
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