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Electrically Polarized Graphene-Blended Spacers for Organic Fouling Reduction in Forward Osmosis

Author(s)
Yanar, NumanLiang, YejinYang, EunmokPark, HosikSon, MoonChoi, Heechul
Issued Date
2021-01
DOI
10.3390/membranes11010036
URI
https://scholarworks.unist.ac.kr/handle/201301/55406
Fulltext
https://www.mdpi.com/2077-0375/11/1/36
Citation
MEMBRANES, v.11, no.1, pp.36
Abstract
In membrane processes, a spacer is known to play a key role in the mitigation of membrane fouling. In this study, the effect of electric polarization on a graphene-blended polymer spacer (e.g., poly(lactic acid), PLA) for organic fouling on membrane surfaces was investigated. A pristine PLA spacer (P-S), a graphene-blended spacer (G-S), and an electrically polarized graphene-blended spacer (EG-S) were successfully fabricated by 3D printing. Organic fouling tests were conducted by the 5-h filtration of CaCl2 and a sodium alginate solution through commercially available membranes, which were placed together with the fabricated spacers. Membranes utilizing P-S, G-S, and EG-S were characterized in terms of the fouling amount on the membrane surface and fouling roughness. Electrostatic forces of EG-S provided 70% less and 90% smoother fouling on the membrane surface, leading to an only 14% less water flux reduction after 5 h of fouling. The importance of nanomaterial blending and polarization was successfully demonstrated herein.
Publisher
MDPI
ISSN
2077-0375
Keyword (Author)
organic foulingelectrically polarized spacer3D printed spacerforward osmosisgraphene-blended spacersnanomaterial-blended spacers
Keyword
FEED SPACERSMEMBRANEPERFORMANCEREVERSEULTRAFILTRATIONSOLUTELAYERFLUX

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