Forward osmosis membranes tailored by hydrogel coatings

Detalhes bibliográficos
Autor(a) principal: Monteiro, Maria Inês Gonçalves
Data de Publicação: 2012
Tipo de documento: Dissertação
Idioma: eng
Título da fonte: Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)
Texto Completo: http://hdl.handle.net/10362/9833
Resumo: Dissertação para obtenção do Grau de Mestre em Engenharia Química e Bioquímica
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spelling Forward osmosis membranes tailored by hydrogel coatingsForward osmosis (FO)Surface coatingHydrogelPoly(ethylene glycol)DiacrylateInternal concentration polarizationDissertação para obtenção do Grau de Mestre em Engenharia Química e BioquímicaForward osmosis (FO) is a promising process to substitute reverse osmosis (RO), as a lower cost and more environmentally friendly desalination process. However, FO still presents some drawbacks, in particular the several internal concentration polarization (CP) effects and insufficient salt selectivity. In order to overcome these disadvantages, this study focuses on the use of hydrogel surface-coated FO membranes to minimize internal CP effect in water purification, and also to improve membrane salt rejection. For this, a series of crosslinked poly(ethylene glycol) (PEG)-based hydrogels were synthesized, by the photopolymerization of poly(ethylene glycol) diacrylate (PEGDA) and the monomer (PEG) in the presence of a photoinitiator. The water uptake and salt permeability of the resulting films were controlled by manipulating the composition ratio of PEGDA and the monomer PEG, by varying the water content in the prepolymerization mixture and the UV-exposure time. High water uptake and low salt permeability values were observed for the films prepared with 50wt% of water content(50%PEGDA). The hydrogels were applied using different techniques (pressure, soaking and coating) to a cellulose acetate (CA) membrane prepared by phase inversion. However, only one technique was effective, surface coating. The CA membranes coated with these hydrogels materials showed an improvement in NaCl rejection (≅100%) and in some cases an enhancement of 100 and 120% of the original water flux (50% PEGDA coating on the active layer and on the porous support, respectively; in PRO mode). The 50%PEGDA coated membrane (with a coating on the porous support) has also shown reduction of the internal CP effects.Faculdade de Ciências e TecnologiaLivingston, AndrewCoelhoso, IsabelKochanov, RuslanRUNMonteiro, Maria Inês Gonçalves2013-06-07T08:42:42Z20122012-01-01T00:00:00Zinfo:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/masterThesisapplication/pdfhttp://hdl.handle.net/10362/9833enginfo:eu-repo/semantics/openAccessreponame:Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)instname:Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informaçãoinstacron:RCAAP2024-03-11T03:43:10Zoai:run.unl.pt:10362/9833Portal AgregadorONGhttps://www.rcaap.pt/oai/openaireopendoar:71602024-03-20T03:19:04.040535Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) - Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informaçãofalse
dc.title.none.fl_str_mv Forward osmosis membranes tailored by hydrogel coatings
title Forward osmosis membranes tailored by hydrogel coatings
spellingShingle Forward osmosis membranes tailored by hydrogel coatings
Monteiro, Maria Inês Gonçalves
Forward osmosis (FO)
Surface coating
Hydrogel
Poly(ethylene glycol)
Diacrylate
Internal concentration polarization
title_short Forward osmosis membranes tailored by hydrogel coatings
title_full Forward osmosis membranes tailored by hydrogel coatings
title_fullStr Forward osmosis membranes tailored by hydrogel coatings
title_full_unstemmed Forward osmosis membranes tailored by hydrogel coatings
title_sort Forward osmosis membranes tailored by hydrogel coatings
author Monteiro, Maria Inês Gonçalves
author_facet Monteiro, Maria Inês Gonçalves
author_role author
dc.contributor.none.fl_str_mv Livingston, Andrew
Coelhoso, Isabel
Kochanov, Ruslan
RUN
dc.contributor.author.fl_str_mv Monteiro, Maria Inês Gonçalves
dc.subject.por.fl_str_mv Forward osmosis (FO)
Surface coating
Hydrogel
Poly(ethylene glycol)
Diacrylate
Internal concentration polarization
topic Forward osmosis (FO)
Surface coating
Hydrogel
Poly(ethylene glycol)
Diacrylate
Internal concentration polarization
description Dissertação para obtenção do Grau de Mestre em Engenharia Química e Bioquímica
publishDate 2012
dc.date.none.fl_str_mv 2012
2012-01-01T00:00:00Z
2013-06-07T08:42:42Z
dc.type.status.fl_str_mv info:eu-repo/semantics/publishedVersion
dc.type.driver.fl_str_mv info:eu-repo/semantics/masterThesis
format masterThesis
status_str publishedVersion
dc.identifier.uri.fl_str_mv http://hdl.handle.net/10362/9833
url http://hdl.handle.net/10362/9833
dc.language.iso.fl_str_mv eng
language eng
dc.rights.driver.fl_str_mv info:eu-repo/semantics/openAccess
eu_rights_str_mv openAccess
dc.format.none.fl_str_mv application/pdf
dc.publisher.none.fl_str_mv Faculdade de Ciências e Tecnologia
publisher.none.fl_str_mv Faculdade de Ciências e Tecnologia
dc.source.none.fl_str_mv reponame:Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)
instname:Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informação
instacron:RCAAP
instname_str Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informação
instacron_str RCAAP
institution RCAAP
reponame_str Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)
collection Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)
repository.name.fl_str_mv Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) - Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informação
repository.mail.fl_str_mv
_version_ 1799137835076288512

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