Natural silicate-TiO2 hybrids for photocatalytic oxidation of formaldehyde in gas phase

Structured hybrid materials based on the combination adsorbent-photocatalyst with optimal mechanical resistance and reduced cost, are prepared by extrusion using four different natural silicates with similar mesoporous distribution: sepiolite (S), bentonite (B), mordenite (M) and kaolinite (K). The...

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Detalles Bibliográficos
Autores: Portela, Raquel, Jansson, Ingrid, Suárez Gil, Silvia, Villarroel, Mirza, Sánchez, Benigno, Ávila García, Pedro
Tipo de recurso: artículo
Fecha de publicación:2017
País:España
Institución:Consejo Superior de Investigaciones Científicas (CSIC)
Repositorio:DIGITAL.CSIC. Repositorio Institucional del CSIC
OAI Identifier:oai:digital.csic.es:10261/163184
Acceso en línea:http://hdl.handle.net/10261/163184
Access Level:acceso abierto
Palabra clave:Photocatalysis
TiO2
Natural silicates
Adsorbent-photocatalyst hybrids
Formaldehyde
VOC
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spelling Natural silicate-TiO2 hybrids for photocatalytic oxidation of formaldehyde in gas phasePortela, RaquelJansson, IngridSuárez Gil, SilviaVillarroel, MirzaSánchez, BenignoÁvila García, PedroPhotocatalysisTiO2Natural silicatesAdsorbent-photocatalyst hybridsFormaldehydeVOCStructured hybrid materials based on the combination adsorbent-photocatalyst with optimal mechanical resistance and reduced cost, are prepared by extrusion using four different natural silicates with similar mesoporous distribution: sepiolite (S), bentonite (B), mordenite (M) and kaolinite (K). The effect of the textural, morphological and structural properties of plate shaped composites calcined at different temperatures on the adsorption and photocatalytic degradation of formaldehyde in gas phase is analyzed. Silicates allows TiO2 extrusion into flat plates with a content of 50 wt% of titania. All shaped materials present adequate mechanical resistance to be scaled-up for use in continuous-flow gas-phase catalytic reactors. Thermal treatment at 500 °C ensures an optimum combination of mechanical, textural and HCHO adsorption properties. The silicates cover part of the TiO2 particles thus reducing the fraction of TiO2 actually exposed on the surface of the composites, essential to carried out the photocatalytic process, but they also allow controlling TiO2 dispersion and the amount of HCHO adsorbed. The HCHO degradation rate is enhanced with all the silicate-TiO2 composites with respect to that of the benchmark TiO2. The incorporation of titania into the silicate matrix favors the gas phase removal of HCHO in the following sequence: MTi > KTi > STi > BTi > TiO2. The exposed fraction of titania particles and the size of the TiO2-anatase crystalline domains determine the efficiency of the hybrid material, which is optimized in high-aluminum kaolinite and mordenite based hybrids.Dr. R. Portela and Dr. S. Suárez are grateful to the Spanish Ministry of Economy and Competitiveness (Spain) for Juan de la Cierva and Ramón Cajal (RyC2007-01123) contracts, respectively. This research was funded by the project INNOFOTO (CTM2011-25093 MINECO-Spain) and the project Ref.: 1130749 (Fondecyt-Chile).Peer reviewedpostprintElsevierMinisterio de Economía y Competitividad (España)Fondo Nacional de Desarrollo Científico y Tecnológico (Chile)Consejo Superior de Investigaciones Científicas [https://ror.org/02gfc7t72]201820182017info:eu-repo/semantics/articlehttp://purl.org/coar/resource_type/c_6501http://hdl.handle.net/10261/163184reponame:DIGITAL.CSIC. Repositorio Institucional del CSICinstname:Consejo Superior de Investigaciones Científicas (CSIC)Ingléshttp://dx.doi.org/10.1016/j.cej.2016.06.018Síinfo:eu-repo/semantics/openAccessoai:digital.csic.es:10261/1631842026-05-22T06:33:51Z
dc.title.none.fl_str_mv Natural silicate-TiO2 hybrids for photocatalytic oxidation of formaldehyde in gas phase
title Natural silicate-TiO2 hybrids for photocatalytic oxidation of formaldehyde in gas phase
spellingShingle Natural silicate-TiO2 hybrids for photocatalytic oxidation of formaldehyde in gas phase
Portela, Raquel
Photocatalysis
TiO2
Natural silicates
Adsorbent-photocatalyst hybrids
Formaldehyde
VOC
title_short Natural silicate-TiO2 hybrids for photocatalytic oxidation of formaldehyde in gas phase
title_full Natural silicate-TiO2 hybrids for photocatalytic oxidation of formaldehyde in gas phase
title_fullStr Natural silicate-TiO2 hybrids for photocatalytic oxidation of formaldehyde in gas phase
title_full_unstemmed Natural silicate-TiO2 hybrids for photocatalytic oxidation of formaldehyde in gas phase
title_sort Natural silicate-TiO2 hybrids for photocatalytic oxidation of formaldehyde in gas phase
dc.creator.none.fl_str_mv Portela, Raquel
Jansson, Ingrid
Suárez Gil, Silvia
Villarroel, Mirza
Sánchez, Benigno
Ávila García, Pedro
author Portela, Raquel
author_facet Portela, Raquel
Jansson, Ingrid
Suárez Gil, Silvia
Villarroel, Mirza
Sánchez, Benigno
Ávila García, Pedro
author_role author
author2 Jansson, Ingrid
Suárez Gil, Silvia
Villarroel, Mirza
Sánchez, Benigno
Ávila García, Pedro
author2_role author
author
author
author
author
dc.contributor.none.fl_str_mv Ministerio de Economía y Competitividad (España)
Fondo Nacional de Desarrollo Científico y Tecnológico (Chile)
Consejo Superior de Investigaciones Científicas [https://ror.org/02gfc7t72]
dc.subject.none.fl_str_mv Photocatalysis
TiO2
Natural silicates
Adsorbent-photocatalyst hybrids
Formaldehyde
VOC
topic Photocatalysis
TiO2
Natural silicates
Adsorbent-photocatalyst hybrids
Formaldehyde
VOC
description Structured hybrid materials based on the combination adsorbent-photocatalyst with optimal mechanical resistance and reduced cost, are prepared by extrusion using four different natural silicates with similar mesoporous distribution: sepiolite (S), bentonite (B), mordenite (M) and kaolinite (K). The effect of the textural, morphological and structural properties of plate shaped composites calcined at different temperatures on the adsorption and photocatalytic degradation of formaldehyde in gas phase is analyzed. Silicates allows TiO2 extrusion into flat plates with a content of 50 wt% of titania. All shaped materials present adequate mechanical resistance to be scaled-up for use in continuous-flow gas-phase catalytic reactors. Thermal treatment at 500 °C ensures an optimum combination of mechanical, textural and HCHO adsorption properties. The silicates cover part of the TiO2 particles thus reducing the fraction of TiO2 actually exposed on the surface of the composites, essential to carried out the photocatalytic process, but they also allow controlling TiO2 dispersion and the amount of HCHO adsorbed. The HCHO degradation rate is enhanced with all the silicate-TiO2 composites with respect to that of the benchmark TiO2. The incorporation of titania into the silicate matrix favors the gas phase removal of HCHO in the following sequence: MTi > KTi > STi > BTi > TiO2. The exposed fraction of titania particles and the size of the TiO2-anatase crystalline domains determine the efficiency of the hybrid material, which is optimized in high-aluminum kaolinite and mordenite based hybrids.
publishDate 2017
dc.date.none.fl_str_mv 2017
2018
2018
dc.type.none.fl_str_mv info:eu-repo/semantics/article
http://purl.org/coar/resource_type/c_6501
format article
dc.identifier.none.fl_str_mv http://hdl.handle.net/10261/163184
url http://hdl.handle.net/10261/163184
dc.language.none.fl_str_mv Inglés
language_invalid_str_mv Inglés
dc.relation.none.fl_str_mv http://dx.doi.org/10.1016/j.cej.2016.06.018
Sí
dc.rights.none.fl_str_mv info:eu-repo/semantics/openAccess
eu_rights_str_mv openAccess
dc.publisher.none.fl_str_mv Elsevier
publisher.none.fl_str_mv Elsevier
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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score 15,81155

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