Gypsum (CaSO42H2O) scaling on polybenzimidazole and cellulose acetate hollow fiber membranes under forward osmosis

Handle URI:
http://hdl.handle.net/10754/325363
Title:
Gypsum (CaSO42H2O) scaling on polybenzimidazole and cellulose acetate hollow fiber membranes under forward osmosis
Authors:
Chen, Si Cong; Su, Jincai; Fu, Feng-Jiang; Mi, Baoxia; Chung, Neal Tai-Shung ( 0000-0003-3704-8609 )
Abstract:
We have examined the gypsum (CaSO42H2O) scaling phenomena on membranes with different physicochemical properties in forward osmosis (FO) processes. Three hollow fiber membranes made of (1) cellulose acetate (CA), (2) polybenzimidazole (PBI)/polyethersulfone (PES) and (3) PBI-polyhedral oligomeric silsesquioxane (POSS)/polyacrylonitrile (PAN) were studied. For the first time in FO processes, we have found that surface ionic interactions dominate gypsum scaling on the membrane surface. A 70% flux reduction was observed on negatively charged CA and PBI membrane surfaces, due to strong attractive forces. The PBI membrane surface also showed a slightly positive charge at a low pH value of 3 and exhibited a 30% flux reduction. The atomic force microscopy (AFM) force measurements confirmed a strong repulsive force between gypsum and PBI at a pH value of 3. The newly developed PBI-POSS/PAN membrane had ridge morphology and a contact angle of 51.42 14.85 after the addition of hydrophilic POSS nanoparticles and 3 min thermal treatment at 95 C. Minimal scaling and an only 1.3% flux reduction were observed at a pH value of 3. Such a ridge structure may reduce scaling by not providing a locally flat surface to the crystallite at a pH value of 3; thus, gypsum would be easily washed away from the surface. 2013 by the authors; licensee MDPI, Basel, Switzerland.
KAUST Department:
Water Desalination and Reuse Research Center (WDRC)
Citation:
Chen S, Su J, Fu F-J, Mi B, Chung T-S (2013) Gypsum (CaSO4·2H2O) Scaling on Polybenzimidazole and Cellulose Acetate Hollow Fiber Membranes under Forward Osmosis. Membranes 3: 354-374. doi:10.3390/membranes3040354.
Publisher:
MDPI AG
Journal:
Membranes
Issue Date:
8-Nov-2013
DOI:
10.3390/membranes3040354
PubMed ID:
24957062
PubMed Central ID:
PMC4021950
Type:
Article
ISSN:
20770375
Appears in Collections:
Articles; Water Desalination and Reuse Research Center (WDRC)

Full metadata record

DC FieldValue Language
dc.contributor.authorChen, Si Congen
dc.contributor.authorSu, Jincaien
dc.contributor.authorFu, Feng-Jiangen
dc.contributor.authorMi, Baoxiaen
dc.contributor.authorChung, Neal Tai-Shungen
dc.date.accessioned2014-08-27T09:49:15Z-
dc.date.available2014-08-27T09:49:15Z-
dc.date.issued2013-11-08en
dc.identifier.citationChen S, Su J, Fu F-J, Mi B, Chung T-S (2013) Gypsum (CaSO4·2H2O) Scaling on Polybenzimidazole and Cellulose Acetate Hollow Fiber Membranes under Forward Osmosis. Membranes 3: 354-374. doi:10.3390/membranes3040354.en
dc.identifier.issn20770375en
dc.identifier.pmid24957062en
dc.identifier.doi10.3390/membranes3040354en
dc.identifier.urihttp://hdl.handle.net/10754/325363en
dc.description.abstractWe have examined the gypsum (CaSO42H2O) scaling phenomena on membranes with different physicochemical properties in forward osmosis (FO) processes. Three hollow fiber membranes made of (1) cellulose acetate (CA), (2) polybenzimidazole (PBI)/polyethersulfone (PES) and (3) PBI-polyhedral oligomeric silsesquioxane (POSS)/polyacrylonitrile (PAN) were studied. For the first time in FO processes, we have found that surface ionic interactions dominate gypsum scaling on the membrane surface. A 70% flux reduction was observed on negatively charged CA and PBI membrane surfaces, due to strong attractive forces. The PBI membrane surface also showed a slightly positive charge at a low pH value of 3 and exhibited a 30% flux reduction. The atomic force microscopy (AFM) force measurements confirmed a strong repulsive force between gypsum and PBI at a pH value of 3. The newly developed PBI-POSS/PAN membrane had ridge morphology and a contact angle of 51.42 14.85 after the addition of hydrophilic POSS nanoparticles and 3 min thermal treatment at 95 C. Minimal scaling and an only 1.3% flux reduction were observed at a pH value of 3. Such a ridge structure may reduce scaling by not providing a locally flat surface to the crystallite at a pH value of 3; thus, gypsum would be easily washed away from the surface. 2013 by the authors; licensee MDPI, Basel, Switzerland.en
dc.language.isoenen
dc.publisherMDPI AGen
dc.rightsThis article is an open access article distributed under the terms and conditions of the Creative Commons Attribution license (http://creativecommons.org/licenses/by/3.0/).en
dc.rights.urihttp://creativecommons.org/licenses/by/3.0/en
dc.subjectCellulose acetateen
dc.subjectForward osmosisen
dc.subjectFoulingen
dc.subjectGypsum scalingen
dc.subjectPolybenzimidazoleen
dc.subjectPolyhedral oligomeric silsesquioxaneen
dc.subjectCellulose acetatesen
dc.subjectPolyhedral oligomeric silsesquioxanesen
dc.subjectAtomic force microscopyen
dc.subjectCelluloseen
dc.subjectGypsumen
dc.subjectOligomersen
dc.subjectOsmosisen
dc.subjectpHen
dc.subjectVolatile fatty acidsen
dc.subjectOsmosis membranesen
dc.titleGypsum (CaSO42H2O) scaling on polybenzimidazole and cellulose acetate hollow fiber membranes under forward osmosisen
dc.typeArticleen
dc.contributor.departmentWater Desalination and Reuse Research Center (WDRC)en
dc.identifier.journalMembranesen
dc.identifier.pmcidPMC4021950en
dc.eprint.versionPublisher's Version/PDFen
dc.contributor.institutionNUS Graduate School for Integrative Sciences and Engineering (NGS), National University of Singapore, 28 Medical Drive, 117456, Singaporeen
dc.contributor.institutionDepartment of Chemical and Biomolecular Engineering, National University of Singapore, 4 Engineering Drive 4, 117576, Singaporeen
dc.contributor.institutionMann+Hummel Ultra-Flo Pte Ltd, 18 Tuas Avenue 8, 639233, Singaporeen
dc.contributor.institutionDepartment of Civil and Environmental Engineering, University of Maryland, College Park, MD 20742, United Statesen
dc.contributor.affiliationKing Abdullah University of Science and Technology (KAUST)en
kaust.authorChung, Neal Tai-Shungen

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