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Article: Effect of membrane chemistry and coating layer on physiochemical properties of thin film composite polyamide RO and NF membranes. II. Membrane physiochemical properties and their dependence on polyamide and coating layers

TitleEffect of membrane chemistry and coating layer on physiochemical properties of thin film composite polyamide RO and NF membranes. II. Membrane physiochemical properties and their dependence on polyamide and coating layers
Authors
KeywordsCoating
Membrane
Nanofiltration
Reverse Osmosis
Thin Film Composite
Issue Date2009
PublisherElsevier BV. The Journal's web site is located at http://www.elsevier.com/locate/desal
Citation
Desalination, 2009, v. 242 n. 1-3, p. 168-182 How to Cite?
AbstractThe physiochemical properties of 17 widely used commercial RO and NF polyamide (PA) membranes were fully characterized by atomic force microscopy, transmission electron microscopy, contact angle measurement, streaming potential analysis, and flux and rejection performance tests. The surface properties (roughness, hydrophilicity, and surface charge) and bulk properties (permeability and rejection) were demonstrated to be highly inter-dependent, as all these were determined by the polyamide chemistry and any associated surface coating layer. The 1,3-benzenediamine and trimesoyl chloride based fully aromatic membranes had surface roughness on the order of 100 nm, an order of magnitude rougher than the semi-aromatic poly(piperazinamide) membranes. Furthermore, the uncoated fully aromatic membranes were significantly more hydrophobic (contact angles 43-49°) than the semi-aromatic ones (~30°). The presence of a neutral polyvinyl alcohol (PVA) coating layer can significantly enhance hydrophilicity and reduce surface charge and roughness for fully aromatic PA membranes, while its effect was only marginal for semi-aromatic poly(piperazinamide) membranes. The selectivity of a membrane appeared to be inversely related with its permeability. The highly permeable piperazine based membranes were much less selective than the fully aromatic ones. The salt rejection of a membrane was enhanced upon coating with a PVA layer, at the expense of reduced permeability. The current study suggests that the physiochemical properties can be used to diagnose the polyamide and coating chemistry, in addition to the conventional spectroscopic methods. Understanding such dependence of membrane properties and performances on their structure and chemistry might also be important for membrane synthesis, modification, and their applications in water and wastewater treatment. © 2008 Elsevier B.V. All rights reserved.
Persistent Identifierhttp://hdl.handle.net/10722/185382
ISSN
2015 Impact Factor: 4.412
2015 SCImago Journal Rankings: 1.549
ISI Accession Number ID
References

 

DC FieldValueLanguage
dc.contributor.authorTang, CYen_US
dc.contributor.authorKwon, YNen_US
dc.contributor.authorLeckie, JOen_US
dc.date.accessioned2013-07-30T07:32:04Z-
dc.date.available2013-07-30T07:32:04Z-
dc.date.issued2009en_US
dc.identifier.citationDesalination, 2009, v. 242 n. 1-3, p. 168-182en_US
dc.identifier.issn0011-9164en_US
dc.identifier.urihttp://hdl.handle.net/10722/185382-
dc.description.abstractThe physiochemical properties of 17 widely used commercial RO and NF polyamide (PA) membranes were fully characterized by atomic force microscopy, transmission electron microscopy, contact angle measurement, streaming potential analysis, and flux and rejection performance tests. The surface properties (roughness, hydrophilicity, and surface charge) and bulk properties (permeability and rejection) were demonstrated to be highly inter-dependent, as all these were determined by the polyamide chemistry and any associated surface coating layer. The 1,3-benzenediamine and trimesoyl chloride based fully aromatic membranes had surface roughness on the order of 100 nm, an order of magnitude rougher than the semi-aromatic poly(piperazinamide) membranes. Furthermore, the uncoated fully aromatic membranes were significantly more hydrophobic (contact angles 43-49°) than the semi-aromatic ones (~30°). The presence of a neutral polyvinyl alcohol (PVA) coating layer can significantly enhance hydrophilicity and reduce surface charge and roughness for fully aromatic PA membranes, while its effect was only marginal for semi-aromatic poly(piperazinamide) membranes. The selectivity of a membrane appeared to be inversely related with its permeability. The highly permeable piperazine based membranes were much less selective than the fully aromatic ones. The salt rejection of a membrane was enhanced upon coating with a PVA layer, at the expense of reduced permeability. The current study suggests that the physiochemical properties can be used to diagnose the polyamide and coating chemistry, in addition to the conventional spectroscopic methods. Understanding such dependence of membrane properties and performances on their structure and chemistry might also be important for membrane synthesis, modification, and their applications in water and wastewater treatment. © 2008 Elsevier B.V. All rights reserved.en_US
dc.languageengen_US
dc.publisherElsevier BV. The Journal's web site is located at http://www.elsevier.com/locate/desalen_US
dc.relation.ispartofDesalinationen_US
dc.subjectCoatingen_US
dc.subjectMembraneen_US
dc.subjectNanofiltrationen_US
dc.subjectReverse Osmosisen_US
dc.subjectThin Film Compositeen_US
dc.titleEffect of membrane chemistry and coating layer on physiochemical properties of thin film composite polyamide RO and NF membranes. II. Membrane physiochemical properties and their dependence on polyamide and coating layersen_US
dc.typeArticleen_US
dc.identifier.emailTang, CY: tangc@hku.hken_US
dc.identifier.authorityTang, CY=rp01765en_US
dc.description.naturelink_to_subscribed_fulltexten_US
dc.identifier.doi10.1016/j.desal.2008.04.004en_US
dc.identifier.scopuseid_2-s2.0-64649085686en_US
dc.relation.referenceshttp://www.scopus.com/mlt/select.url?eid=2-s2.0-64649085686&selection=ref&src=s&origin=recordpageen_US
dc.identifier.volume242en_US
dc.identifier.issue1-3en_US
dc.identifier.spage168en_US
dc.identifier.epage182en_US
dc.identifier.isiWOS:000266152500014-
dc.publisher.placeNetherlandsen_US
dc.identifier.scopusauthoridTang, CY=35489259800en_US
dc.identifier.scopusauthoridKwon, YN=14123466400en_US
dc.identifier.scopusauthoridLeckie, JO=7006717360en_US

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