Solvent-controlled deposition of titania on silica spheres for the preparation of SiO2@TiO2 core@shell nanoparticles with enhanced photocatalytic activity
Autor(a) principal: | |
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Data de Publicação: | 2019 |
Outros Autores: | , , , , , , |
Tipo de documento: | Artigo |
Idioma: | eng |
Título da fonte: | Repositório Institucional da UNESP |
Texto Completo: | http://dx.doi.org/10.1016/j.colsurfa.2019.03.036 http://hdl.handle.net/11449/184440 |
Resumo: | Controlled synthesis of SiO2@TiO2 core@shell particles is important for effectively exploiting the unique properties associated with core@shell architecture and obtaining photocatalysts with enhanced photoactivity. Herein, we propose an alternative, simple and rational solvent-based synthetic strategy for the reproducible and controlled coating of anatase nanocrystals ((similar to)5 nm) over submicron SiO2 spheres. This strategy is based on the fact that titanium (IV) isopropoxide (TiP), the TiO2 precursor, exists in oligomeric (less reactive) and monomeric (more reactive) forms in ethanol-rich and isopropanol-rich solvent, respectively. The different reactivity of TiP in mixed solvents with varying ethanol/isopropanol ratio thus allows a precise control over the rate of titania deposition or TiO2 loading as well as the resultant particle morphology through simple manipulation of isopropanol/ethanol ratio of the solvent mixture used in the sol-gel process. Based on a detailed characterization of the samples using an array of complementary characterization techniques, a comprehensive discussion on the relationship between solvent composition, particle morphology and their photoactivity is presented. Photocatalytic dye degradation assays reveal that SiO2@TiO2 particles with uniform morphology obtained by solvent-controlled deposition show enhanced activity per mass unit of TiO2, thus confirming the importance of controlled deposition of titania for the design of efficient core@shell photocatalytic systems. The solvent-based synthetic strategy proposed here is facile, general and effective in controlling the structure and composition of the SiO2@TiO2 particles which, in turn, allows one to tune the photocatalytic properties and obtain core@TiO2 composite photocatalysts with improved photocatalytic activity. |
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Repositório Institucional da UNESP |
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Solvent-controlled deposition of titania on silica spheres for the preparation of SiO2@TiO2 core@shell nanoparticles with enhanced photocatalytic activitySiO2@TiO2Core@shellPhotocatalysisAnataseSol-gelAlkoxide oligomersControlled synthesis of SiO2@TiO2 core@shell particles is important for effectively exploiting the unique properties associated with core@shell architecture and obtaining photocatalysts with enhanced photoactivity. Herein, we propose an alternative, simple and rational solvent-based synthetic strategy for the reproducible and controlled coating of anatase nanocrystals ((similar to)5 nm) over submicron SiO2 spheres. This strategy is based on the fact that titanium (IV) isopropoxide (TiP), the TiO2 precursor, exists in oligomeric (less reactive) and monomeric (more reactive) forms in ethanol-rich and isopropanol-rich solvent, respectively. The different reactivity of TiP in mixed solvents with varying ethanol/isopropanol ratio thus allows a precise control over the rate of titania deposition or TiO2 loading as well as the resultant particle morphology through simple manipulation of isopropanol/ethanol ratio of the solvent mixture used in the sol-gel process. Based on a detailed characterization of the samples using an array of complementary characterization techniques, a comprehensive discussion on the relationship between solvent composition, particle morphology and their photoactivity is presented. Photocatalytic dye degradation assays reveal that SiO2@TiO2 particles with uniform morphology obtained by solvent-controlled deposition show enhanced activity per mass unit of TiO2, thus confirming the importance of controlled deposition of titania for the design of efficient core@shell photocatalytic systems. The solvent-based synthetic strategy proposed here is facile, general and effective in controlling the structure and composition of the SiO2@TiO2 particles which, in turn, allows one to tune the photocatalytic properties and obtain core@TiO2 composite photocatalysts with improved photocatalytic activity.Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)Univ Sao Paulo, Inst Quim Sao Carlos, BR-13560970 Sao Carlos, SP, BrazilUniv Estadual Paulista, Inst Quim, BR-14800060 Araraquara, SP, BrazilUniv Peshawar, Inst Chem Sci, Peshawar 25120, KP, PakistanUniv Estadual Paulista, Inst Geociencias & Ciencias Exatas, BR-13500970 Rio Claro, SP, BrazilFraunhofer Inst Mfg Technol & Adv Mat, D-28359 Bremen, GermanyUniv Estadual Paulista, Inst Quim, BR-14800060 Araraquara, SP, BrazilUniv Estadual Paulista, Inst Geociencias & Ciencias Exatas, BR-13500970 Rio Claro, SP, BrazilFAPESP: 2013/24948-3FAPESP: 2016/10939-0CNPq: 302185/2017-8Elsevier B.V.Universidade de São Paulo (USP)Universidade Estadual Paulista (Unesp)Univ PeshawarFraunhofer Inst Mfg Technol & Adv MatFerreira-Neto, Elias P. [UNESP]Ullah, SajjadSimoes, Mateus B.Perissinotto, Amanda P.Vicente, Fabio S. de [UNESP]Noeske, Paul-Ludwig M.Ribeiro, Sidney J. L. [UNESP]Rodrigues-Filho, Ubirajara P.2019-10-04T12:13:39Z2019-10-04T12:13:39Z2019-06-05info:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/article293-305http://dx.doi.org/10.1016/j.colsurfa.2019.03.036Colloids and Surfaces A: Physicochemical and Engineering Aspects, v. 570, p. 293-305, 2019.0927-7757http://hdl.handle.net/11449/18444010.1016/j.colsurfa.2019.03.036WOS:0004641326000344303802780216754840821634995737864460474630346540000-0002-9810-75640000-0001-7696-30040000-0003-3286-9440Web of Sciencereponame:Repositório Institucional da UNESPinstname:Universidade Estadual Paulista (UNESP)instacron:UNESPengColloids and Surfaces A: Physicochemical and Engineering Aspectsinfo:eu-repo/semantics/openAccess2023-01-26T13:01:31Zoai:repositorio.unesp.br:11449/184440Repositório InstitucionalPUBhttp://repositorio.unesp.br/oai/requestopendoar:29462023-01-26T13:01:31Repositório Institucional da UNESP - Universidade Estadual Paulista (UNESP)false |
dc.title.none.fl_str_mv |
Solvent-controlled deposition of titania on silica spheres for the preparation of SiO2@TiO2 core@shell nanoparticles with enhanced photocatalytic activity |
title |
Solvent-controlled deposition of titania on silica spheres for the preparation of SiO2@TiO2 core@shell nanoparticles with enhanced photocatalytic activity |
spellingShingle |
Solvent-controlled deposition of titania on silica spheres for the preparation of SiO2@TiO2 core@shell nanoparticles with enhanced photocatalytic activity Ferreira-Neto, Elias P. [UNESP] SiO2@TiO2 Core@shell Photocatalysis Anatase Sol-gel Alkoxide oligomers |
title_short |
Solvent-controlled deposition of titania on silica spheres for the preparation of SiO2@TiO2 core@shell nanoparticles with enhanced photocatalytic activity |
title_full |
Solvent-controlled deposition of titania on silica spheres for the preparation of SiO2@TiO2 core@shell nanoparticles with enhanced photocatalytic activity |
title_fullStr |
Solvent-controlled deposition of titania on silica spheres for the preparation of SiO2@TiO2 core@shell nanoparticles with enhanced photocatalytic activity |
title_full_unstemmed |
Solvent-controlled deposition of titania on silica spheres for the preparation of SiO2@TiO2 core@shell nanoparticles with enhanced photocatalytic activity |
title_sort |
Solvent-controlled deposition of titania on silica spheres for the preparation of SiO2@TiO2 core@shell nanoparticles with enhanced photocatalytic activity |
author |
Ferreira-Neto, Elias P. [UNESP] |
author_facet |
Ferreira-Neto, Elias P. [UNESP] Ullah, Sajjad Simoes, Mateus B. Perissinotto, Amanda P. Vicente, Fabio S. de [UNESP] Noeske, Paul-Ludwig M. Ribeiro, Sidney J. L. [UNESP] Rodrigues-Filho, Ubirajara P. |
author_role |
author |
author2 |
Ullah, Sajjad Simoes, Mateus B. Perissinotto, Amanda P. Vicente, Fabio S. de [UNESP] Noeske, Paul-Ludwig M. Ribeiro, Sidney J. L. [UNESP] Rodrigues-Filho, Ubirajara P. |
author2_role |
author author author author author author author |
dc.contributor.none.fl_str_mv |
Universidade de São Paulo (USP) Universidade Estadual Paulista (Unesp) Univ Peshawar Fraunhofer Inst Mfg Technol & Adv Mat |
dc.contributor.author.fl_str_mv |
Ferreira-Neto, Elias P. [UNESP] Ullah, Sajjad Simoes, Mateus B. Perissinotto, Amanda P. Vicente, Fabio S. de [UNESP] Noeske, Paul-Ludwig M. Ribeiro, Sidney J. L. [UNESP] Rodrigues-Filho, Ubirajara P. |
dc.subject.por.fl_str_mv |
SiO2@TiO2 Core@shell Photocatalysis Anatase Sol-gel Alkoxide oligomers |
topic |
SiO2@TiO2 Core@shell Photocatalysis Anatase Sol-gel Alkoxide oligomers |
description |
Controlled synthesis of SiO2@TiO2 core@shell particles is important for effectively exploiting the unique properties associated with core@shell architecture and obtaining photocatalysts with enhanced photoactivity. Herein, we propose an alternative, simple and rational solvent-based synthetic strategy for the reproducible and controlled coating of anatase nanocrystals ((similar to)5 nm) over submicron SiO2 spheres. This strategy is based on the fact that titanium (IV) isopropoxide (TiP), the TiO2 precursor, exists in oligomeric (less reactive) and monomeric (more reactive) forms in ethanol-rich and isopropanol-rich solvent, respectively. The different reactivity of TiP in mixed solvents with varying ethanol/isopropanol ratio thus allows a precise control over the rate of titania deposition or TiO2 loading as well as the resultant particle morphology through simple manipulation of isopropanol/ethanol ratio of the solvent mixture used in the sol-gel process. Based on a detailed characterization of the samples using an array of complementary characterization techniques, a comprehensive discussion on the relationship between solvent composition, particle morphology and their photoactivity is presented. Photocatalytic dye degradation assays reveal that SiO2@TiO2 particles with uniform morphology obtained by solvent-controlled deposition show enhanced activity per mass unit of TiO2, thus confirming the importance of controlled deposition of titania for the design of efficient core@shell photocatalytic systems. The solvent-based synthetic strategy proposed here is facile, general and effective in controlling the structure and composition of the SiO2@TiO2 particles which, in turn, allows one to tune the photocatalytic properties and obtain core@TiO2 composite photocatalysts with improved photocatalytic activity. |
publishDate |
2019 |
dc.date.none.fl_str_mv |
2019-10-04T12:13:39Z 2019-10-04T12:13:39Z 2019-06-05 |
dc.type.status.fl_str_mv |
info:eu-repo/semantics/publishedVersion |
dc.type.driver.fl_str_mv |
info:eu-repo/semantics/article |
format |
article |
status_str |
publishedVersion |
dc.identifier.uri.fl_str_mv |
http://dx.doi.org/10.1016/j.colsurfa.2019.03.036 Colloids and Surfaces A: Physicochemical and Engineering Aspects, v. 570, p. 293-305, 2019. 0927-7757 http://hdl.handle.net/11449/184440 10.1016/j.colsurfa.2019.03.036 WOS:000464132600034 4303802780216754 8408216349957378 6446047463034654 0000-0002-9810-7564 0000-0001-7696-3004 0000-0003-3286-9440 |
url |
http://dx.doi.org/10.1016/j.colsurfa.2019.03.036 http://hdl.handle.net/11449/184440 |
identifier_str_mv |
Colloids and Surfaces A: Physicochemical and Engineering Aspects, v. 570, p. 293-305, 2019. 0927-7757 10.1016/j.colsurfa.2019.03.036 WOS:000464132600034 4303802780216754 8408216349957378 6446047463034654 0000-0002-9810-7564 0000-0001-7696-3004 0000-0003-3286-9440 |
dc.language.iso.fl_str_mv |
eng |
language |
eng |
dc.relation.none.fl_str_mv |
Colloids and Surfaces A: Physicochemical and Engineering Aspects |
dc.rights.driver.fl_str_mv |
info:eu-repo/semantics/openAccess |
eu_rights_str_mv |
openAccess |
dc.format.none.fl_str_mv |
293-305 |
dc.publisher.none.fl_str_mv |
Elsevier B.V. |
publisher.none.fl_str_mv |
Elsevier B.V. |
dc.source.none.fl_str_mv |
Web of Science reponame:Repositório Institucional da UNESP instname:Universidade Estadual Paulista (UNESP) instacron:UNESP |
instname_str |
Universidade Estadual Paulista (UNESP) |
instacron_str |
UNESP |
institution |
UNESP |
reponame_str |
Repositório Institucional da UNESP |
collection |
Repositório Institucional da UNESP |
repository.name.fl_str_mv |
Repositório Institucional da UNESP - Universidade Estadual Paulista (UNESP) |
repository.mail.fl_str_mv |
|
_version_ |
1799964622935031808 |