Improved electro-assisted removal of phosphates and nitrates using mesoporous carbon aerogels with controlled porosity

Three-activated carbon aerogels were synthesized by CO2 activation of the materials prepared by the polycondensation of resorcinol and formaldehyde mixtures followed by supercritical drying. The obtained carbon aerogels were characterized and used as electrode materials for the electrosorption of so...

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Autores: Macías, Carlos, Lavela, P., Rasines, Gloria, Zafra, M. C., Tirado, J.L., Ovín Ania, María Concepción
Tipo de recurso: artículo
Estado:Versión aceptada para publicación
Fecha de publicación:2014
País:España
Institución:Consejo Superior de Investigaciones Científicas (CSIC)
Repositorio:DIGITAL.CSIC. Repositorio Institucional del CSIC
OAI Identifier:oai:digital.csic.es:10261/102386
Acceso en línea:http://hdl.handle.net/10261/102386
Access Level:acceso abierto
Palabra clave:Carbon aerogels
Electrosorption
Voltammetry
Impedance spectroscopy
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spelling Improved electro-assisted removal of phosphates and nitrates using mesoporous carbon aerogels with controlled porosityMacías, CarlosLavela, P.Rasines, GloriaZafra, M. C.Tirado, J.L.Ovín Ania, María ConcepciónCarbon aerogelsElectrosorptionVoltammetryImpedance spectroscopyThree-activated carbon aerogels were synthesized by CO2 activation of the materials prepared by the polycondensation of resorcinol and formaldehyde mixtures followed by supercritical drying. The obtained carbon aerogels were characterized and used as electrode materials for the electrosorption of sodium phosphate and nitrate. X-ray diffraction and Raman spectroscopy showed the dependence of the structural ordering of the aerogels with the resorcinol/catalyst ratio and the extent of activation. The electrosorption capacitance evaluated by cyclic voltammetry revealed large values for the activated samples containing a large contribution of mesopores, regardless the electrolyte salt. Due to an adequate combination of chemical and porous features, the desalting capacity of the activated carbon aerogel electrodes exceeded that of the as-prepared materials. The evaluation of the kinetic properties by chronocoulometric relaxation and impedance spectroscopy showed a decrease of time constant and resistances for highly mesoporous activated samples. A high deionization capacity and fast electrode discharge was detected for the deionization of sodium nitrate on the highly mesoporous activated aerogel. Data also showed the efficient electrosorption of ionic species on consecutive charge/discharge cycles, confirming the stability of the aerogel electrodes at the high applied potentials.The authors are indebted to the MICINN (Contract IPT-2011-1450-310000 (ADECAR), and CTM2011/23378) for the financial support. We also thank the fruitful collaboration of Isolux Ingeniería, S.A., Fundación Imdea Energia and Proingesa.Peer reviewedSpringer NatureConsejo Superior de Investigaciones Científicas [https://ror.org/02gfc7t72]201420142014info:eu-repo/semantics/articlehttp://purl.org/coar/resource_type/c_6501Postprintinfo:eu-repo/semantics/acceptedVersionhttp://hdl.handle.net/10261/102386reponame:DIGITAL.CSIC. Repositorio Institucional del CSICinstname:Consejo Superior de Investigaciones Científicas (CSIC)Ingléshttp://dx.doi.org/10.1007/s10800-014-0705-zSíinfo:eu-repo/semantics/openAccessoai:digital.csic.es:10261/1023862026-05-22T06:33:51Z
dc.title.none.fl_str_mv Improved electro-assisted removal of phosphates and nitrates using mesoporous carbon aerogels with controlled porosity
title Improved electro-assisted removal of phosphates and nitrates using mesoporous carbon aerogels with controlled porosity
spellingShingle Improved electro-assisted removal of phosphates and nitrates using mesoporous carbon aerogels with controlled porosity
Macías, Carlos
Carbon aerogels
Electrosorption
Voltammetry
Impedance spectroscopy
title_short Improved electro-assisted removal of phosphates and nitrates using mesoporous carbon aerogels with controlled porosity
title_full Improved electro-assisted removal of phosphates and nitrates using mesoporous carbon aerogels with controlled porosity
title_fullStr Improved electro-assisted removal of phosphates and nitrates using mesoporous carbon aerogels with controlled porosity
title_full_unstemmed Improved electro-assisted removal of phosphates and nitrates using mesoporous carbon aerogels with controlled porosity
title_sort Improved electro-assisted removal of phosphates and nitrates using mesoporous carbon aerogels with controlled porosity
dc.creator.none.fl_str_mv Macías, Carlos
Lavela, P.
Rasines, Gloria
Zafra, M. C.
Tirado, J.L.
Ovín Ania, María Concepción
author Macías, Carlos
author_facet Macías, Carlos
Lavela, P.
Rasines, Gloria
Zafra, M. C.
Tirado, J.L.
Ovín Ania, María Concepción
author_role author
author2 Lavela, P.
Rasines, Gloria
Zafra, M. C.
Tirado, J.L.
Ovín Ania, María Concepción
author2_role author
author
author
author
author
dc.contributor.none.fl_str_mv Consejo Superior de Investigaciones Científicas [https://ror.org/02gfc7t72]
dc.subject.none.fl_str_mv Carbon aerogels
Electrosorption
Voltammetry
Impedance spectroscopy
topic Carbon aerogels
Electrosorption
Voltammetry
Impedance spectroscopy
description Three-activated carbon aerogels were synthesized by CO2 activation of the materials prepared by the polycondensation of resorcinol and formaldehyde mixtures followed by supercritical drying. The obtained carbon aerogels were characterized and used as electrode materials for the electrosorption of sodium phosphate and nitrate. X-ray diffraction and Raman spectroscopy showed the dependence of the structural ordering of the aerogels with the resorcinol/catalyst ratio and the extent of activation. The electrosorption capacitance evaluated by cyclic voltammetry revealed large values for the activated samples containing a large contribution of mesopores, regardless the electrolyte salt. Due to an adequate combination of chemical and porous features, the desalting capacity of the activated carbon aerogel electrodes exceeded that of the as-prepared materials. The evaluation of the kinetic properties by chronocoulometric relaxation and impedance spectroscopy showed a decrease of time constant and resistances for highly mesoporous activated samples. A high deionization capacity and fast electrode discharge was detected for the deionization of sodium nitrate on the highly mesoporous activated aerogel. Data also showed the efficient electrosorption of ionic species on consecutive charge/discharge cycles, confirming the stability of the aerogel electrodes at the high applied potentials.
publishDate 2014
dc.date.none.fl_str_mv 2014
2014
2014
dc.type.none.fl_str_mv info:eu-repo/semantics/article
http://purl.org/coar/resource_type/c_6501
Postprint
info:eu-repo/semantics/acceptedVersion
format article
status_str acceptedVersion
dc.identifier.none.fl_str_mv http://hdl.handle.net/10261/102386
url http://hdl.handle.net/10261/102386
dc.language.none.fl_str_mv Inglés
language_invalid_str_mv Inglés
dc.relation.none.fl_str_mv http://dx.doi.org/10.1007/s10800-014-0705-z
Sí
dc.rights.none.fl_str_mv info:eu-repo/semantics/openAccess
eu_rights_str_mv openAccess
dc.publisher.none.fl_str_mv Springer Nature
publisher.none.fl_str_mv Springer Nature
dc.source.none.fl_str_mv reponame:DIGITAL.CSIC. Repositorio Institucional del CSIC
instname:Consejo Superior de Investigaciones Científicas (CSIC)
instname_str Consejo Superior de Investigaciones Científicas (CSIC)
reponame_str DIGITAL.CSIC. Repositorio Institucional del CSIC
collection DIGITAL.CSIC. Repositorio Institucional del CSIC
repository.name.fl_str_mv
repository.mail.fl_str_mv
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