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Article: Novel molecular level insights into forward osmosis membrane fouling affected by reverse diffusion of draw solutions based on thermodynamic mechanisms

TitleNovel molecular level insights into forward osmosis membrane fouling affected by reverse diffusion of draw solutions based on thermodynamic mechanisms
Authors
KeywordsFOMBR membrane fouling
Reverse diffusion of draw solution
Molecular chains observation
Chemical potential barrier
Density functional theory
Issue Date2021
PublisherElsevier BV. The Journal's web site is located at http://www.elsevier.com/locate/memsci
Citation
Journal of Membrane Science, 2021, v. 620, p. article no. 118815 How to Cite?
AbstractForward osmosis membrane bioreactor (FOMBR) has a more intricate membrane fouling mechanism than MBR because of the special existence of the reverse diffusion of draw solution. The mechanisms of membrane fouling affected by reverse diffusion of draw solution and ion content in gel layer were investigated from thermodynamic perspective and molecular level in this study. Phase-contrast microscopy non-invasively observed that the molecular chain structure of the gel layer containing low content of reverse diffused solute (NaCl) was sparse, while the alginate molecular chains with high NaCl content were parallel and compact. Density functional theory (DFT) further simulated the formation mechanism of different alginate chain structures, that is, the reverse diffused solute shortened the distance between hydrogen bonds and reduced the interaction energy at the terminals of alginate chains. This proved that the NaCl trapped in alginate layer directly affected its structure. Heating experiments indicated that gel layer acted as a “chemical potential barrier” that prevented bound water from turning into free water. Accordingly, the “chemical potential barrier” described by Flory-Huggins theory was proposed, which was confirmed to account for the filtration of alginate gels affected by reverse diffusion of draw solution. To the best of our knowledge, this is the first membrane fouling study that explores the effect of reverse diffusion of draw solution on the “chemical potential barrier” of gel layer from perspective of molecular chain structure. This study investigated FOMBR fouling mechanism at molecular level and provided a new strategy for FOMBR system fouling quantification.
Persistent Identifierhttp://hdl.handle.net/10722/306365
ISSN
2023 Impact Factor: 8.4
2023 SCImago Journal Rankings: 1.848
ISI Accession Number ID

 

DC FieldValueLanguage
dc.contributor.authorTeng, J-
dc.contributor.authorZhang, H-
dc.contributor.authorTang, C-
dc.contributor.authorLin, H-
dc.date.accessioned2021-10-20T10:22:35Z-
dc.date.available2021-10-20T10:22:35Z-
dc.date.issued2021-
dc.identifier.citationJournal of Membrane Science, 2021, v. 620, p. article no. 118815-
dc.identifier.issn0376-7388-
dc.identifier.urihttp://hdl.handle.net/10722/306365-
dc.description.abstractForward osmosis membrane bioreactor (FOMBR) has a more intricate membrane fouling mechanism than MBR because of the special existence of the reverse diffusion of draw solution. The mechanisms of membrane fouling affected by reverse diffusion of draw solution and ion content in gel layer were investigated from thermodynamic perspective and molecular level in this study. Phase-contrast microscopy non-invasively observed that the molecular chain structure of the gel layer containing low content of reverse diffused solute (NaCl) was sparse, while the alginate molecular chains with high NaCl content were parallel and compact. Density functional theory (DFT) further simulated the formation mechanism of different alginate chain structures, that is, the reverse diffused solute shortened the distance between hydrogen bonds and reduced the interaction energy at the terminals of alginate chains. This proved that the NaCl trapped in alginate layer directly affected its structure. Heating experiments indicated that gel layer acted as a “chemical potential barrier” that prevented bound water from turning into free water. Accordingly, the “chemical potential barrier” described by Flory-Huggins theory was proposed, which was confirmed to account for the filtration of alginate gels affected by reverse diffusion of draw solution. To the best of our knowledge, this is the first membrane fouling study that explores the effect of reverse diffusion of draw solution on the “chemical potential barrier” of gel layer from perspective of molecular chain structure. This study investigated FOMBR fouling mechanism at molecular level and provided a new strategy for FOMBR system fouling quantification.-
dc.languageeng-
dc.publisherElsevier BV. The Journal's web site is located at http://www.elsevier.com/locate/memsci-
dc.relation.ispartofJournal of Membrane Science-
dc.subjectFOMBR membrane fouling-
dc.subjectReverse diffusion of draw solution-
dc.subjectMolecular chains observation-
dc.subjectChemical potential barrier-
dc.subjectDensity functional theory-
dc.titleNovel molecular level insights into forward osmosis membrane fouling affected by reverse diffusion of draw solutions based on thermodynamic mechanisms-
dc.typeArticle-
dc.identifier.emailTang, C: tangc@hku.hk-
dc.identifier.authorityTang, C=rp01765-
dc.description.naturelink_to_subscribed_fulltext-
dc.identifier.doi10.1016/j.memsci.2020.118815-
dc.identifier.scopuseid_2-s2.0-85092762077-
dc.identifier.hkuros326752-
dc.identifier.volume620-
dc.identifier.spagearticle no. 118815-
dc.identifier.epagearticle no. 118815-
dc.identifier.isiWOS:000609142200002-
dc.publisher.placeNetherlands-

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