Design and characterization of macroporous alumina membranes for passive samplers of water contaminants

Macroporous ceramic membranes with hierarchical pore structure were developed and characterized for the time-integrated analysis of water contaminants. The alumina membranes were boosted to allow a suitable diffusion rate for envisaged applications. Sacrificial fugitives as cornstarch and graphite a...

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Autores: Orera, V.M., Silva, J., Franquet-Griell, H., Lacorte, S.
Tipo de recurso: artículo
Estado:Versión aceptada para publicación
Fecha de publicación:2018
País:España
Institución:Universidad de Zaragoza
Repositorio:Zaguán. Repositorio Digital de la Universidad de Zaragoza
OAI Identifier:oai:zaguan.unizar.es:75916
Acceso en línea:http://zaguan.unizar.es/record/75916
Access Level:acceso abierto
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spelling Design and characterization of macroporous alumina membranes for passive samplers of water contaminantsOrera, V.M.Silva, J.Franquet-Griell, H.Lacorte, S.Macroporous ceramic membranes with hierarchical pore structure were developed and characterized for the time-integrated analysis of water contaminants. The alumina membranes were boosted to allow a suitable diffusion rate for envisaged applications. Sacrificial fugitives as cornstarch and graphite and partial sintering technique were utilized for the control of pore structure and morphology. The present study includes: (i) Development of ceramic membrane preparation methods based on wet forming techniques and partial sintering in order to control of membrane parameters such as porosity, tortuosity factor and thickness; (ii) Microstructural characterization of the ceramic membranes using two complementary techniques: Hg-porosimetry and SEM; (iii) the diffusion tests performed under laboratory conditions by an innovative, easy and accurate method based in the use of methylene blue (C16H18ClN3S) water solutions as test compound to study the characteristics of ceramic membranes. Using slip casting and partial sintering processing three different Al2O3 membrane configurations with high values 34.5, 36.9 and 39.6 vol% of interconnected porosity and 1.75, 1.7 and 1.3 mm thickness were prepared. The pore morphology consisted of spherical cavities of 5-10 µm diameter and small pores of 70–200 nm. This study also gathers the basis for the calculation of diffusion coefficients, membrane geometrical factor and sampling rates using methylene blue water solutions whose concentration can be accurately determined by optical absorption measurements at 664 nm. Diffusion coefficients for methylene blue range from 2.3 ± 0.5E-8 to 3.0 ± 0.5E-8 cm2 s-1 increasing as connected porosity increases and membrane thickness decreases. The membrane geometrical factors are low, between 0.6 and 1E-02 and Archie''s constants large 4.5–5.5. This has been associated to the bimodal pore structure with coexistence of large and small pores that may increase the tortuosity factors in membranes. The macroporous ceramic membranes herein developed are suitable for the fabrication of passive samplers aimed at preconcentrating organic contaminants in water.2018info:eu-repo/semantics/articleinfo:eu-repo/semantics/acceptedVersionapplication/pdfhttp://zaguan.unizar.es/record/75916reponame:Zaguán. Repositorio Digital de la Universidad de Zaragozainstname:Universidad de ZaragozaInglésinfo:eu-repo/grantAgreement/ES/MINECO/BES-2012-053000-FPIinfo:eu-repo/grantAgreement/ES/MINECO/CTM2014-60199-Pinfo:eu-repo/grantAgreement/ES/MINECO/MAT2015-68078-Rinfo:eu-repo/semantics/openAccessoai:zaguan.unizar.es:759162026-05-29T13:59:51Z
dc.title.none.fl_str_mv Design and characterization of macroporous alumina membranes for passive samplers of water contaminants
title Design and characterization of macroporous alumina membranes for passive samplers of water contaminants
spellingShingle Design and characterization of macroporous alumina membranes for passive samplers of water contaminants
Orera, V.M.
title_short Design and characterization of macroporous alumina membranes for passive samplers of water contaminants
title_full Design and characterization of macroporous alumina membranes for passive samplers of water contaminants
title_fullStr Design and characterization of macroporous alumina membranes for passive samplers of water contaminants
title_full_unstemmed Design and characterization of macroporous alumina membranes for passive samplers of water contaminants
title_sort Design and characterization of macroporous alumina membranes for passive samplers of water contaminants
dc.creator.none.fl_str_mv Orera, V.M.
Silva, J.
Franquet-Griell, H.
Lacorte, S.
author Orera, V.M.
author_facet Orera, V.M.
Silva, J.
Franquet-Griell, H.
Lacorte, S.
author_role author
author2 Silva, J.
Franquet-Griell, H.
Lacorte, S.
author2_role author
author
author
description Macroporous ceramic membranes with hierarchical pore structure were developed and characterized for the time-integrated analysis of water contaminants. The alumina membranes were boosted to allow a suitable diffusion rate for envisaged applications. Sacrificial fugitives as cornstarch and graphite and partial sintering technique were utilized for the control of pore structure and morphology. The present study includes: (i) Development of ceramic membrane preparation methods based on wet forming techniques and partial sintering in order to control of membrane parameters such as porosity, tortuosity factor and thickness; (ii) Microstructural characterization of the ceramic membranes using two complementary techniques: Hg-porosimetry and SEM; (iii) the diffusion tests performed under laboratory conditions by an innovative, easy and accurate method based in the use of methylene blue (C16H18ClN3S) water solutions as test compound to study the characteristics of ceramic membranes. Using slip casting and partial sintering processing three different Al2O3 membrane configurations with high values 34.5, 36.9 and 39.6 vol% of interconnected porosity and 1.75, 1.7 and 1.3 mm thickness were prepared. The pore morphology consisted of spherical cavities of 5-10 µm diameter and small pores of 70–200 nm. This study also gathers the basis for the calculation of diffusion coefficients, membrane geometrical factor and sampling rates using methylene blue water solutions whose concentration can be accurately determined by optical absorption measurements at 664 nm. Diffusion coefficients for methylene blue range from 2.3 ± 0.5E-8 to 3.0 ± 0.5E-8 cm2 s-1 increasing as connected porosity increases and membrane thickness decreases. The membrane geometrical factors are low, between 0.6 and 1E-02 and Archie''s constants large 4.5–5.5. This has been associated to the bimodal pore structure with coexistence of large and small pores that may increase the tortuosity factors in membranes. The macroporous ceramic membranes herein developed are suitable for the fabrication of passive samplers aimed at preconcentrating organic contaminants in water.
publishDate 2018
dc.date.none.fl_str_mv 2018
dc.type.none.fl_str_mv info:eu-repo/semantics/article
info:eu-repo/semantics/acceptedVersion
format article
status_str acceptedVersion
dc.identifier.none.fl_str_mv http://zaguan.unizar.es/record/75916
url http://zaguan.unizar.es/record/75916
dc.language.none.fl_str_mv Inglés
language_invalid_str_mv Inglés
dc.relation.none.fl_str_mv info:eu-repo/grantAgreement/ES/MINECO/BES-2012-053000-FPI
info:eu-repo/grantAgreement/ES/MINECO/CTM2014-60199-P
info:eu-repo/grantAgreement/ES/MINECO/MAT2015-68078-R
dc.rights.none.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
publisher.none.fl_str_mv
dc.source.none.fl_str_mv reponame:Zaguán. Repositorio Digital de la Universidad de Zaragoza
instname:Universidad de Zaragoza
instname_str Universidad de Zaragoza
reponame_str Zaguán. Repositorio Digital de la Universidad de Zaragoza
collection Zaguán. Repositorio Digital de la Universidad de Zaragoza
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