Non-aqueous sol-gel synthesis through a low-temperature solvothermal process of anatase showing visible-light photocatalytic activity
Autor(a) principal: | |
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Data de Publicação: | 2014 |
Outros Autores: | , , , , , |
Tipo de documento: | Artigo |
Idioma: | eng |
Título da fonte: | Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) |
Texto Completo: | http://hdl.handle.net/10773/19828 |
Resumo: | A novel, facile method based on a non-aqueous sol-gel solvothermal process has been developed to synthesise spherical TiO2 nanoparticles (NPs) in one pot. The reaction between titanium(IV) tert-butoxide (Ti[OC(CH3)(3)](4)) and benzyl alcohol was a simple process, which resulted in the formation of highly crystalline titania NPs with a small size of only 6 nm, and with a correspondingly high surface area. The chemical formation mechanism of the metal oxide NPs has been proposed, and the degree of surface hydroxyls (-OH groups) has been examined. The products of the synthesis were characterised by X-ray powder diffraction (XRPD) using the advanced whole powder pattern modelling (WPPM) method, high-resolution transmission electron microscopy (HR-TEM), thermo-gravimetric analysis (TGA), UV-visible diffuse reflectance spectroscopy (DRS), Fourier transform infrared spectroscopy (FT-IR), and nuclear magnetic resonance (NMR) spectroscopy. The photocatalytic activity (PCA) was evaluated in both the liquid-solid phase, by monitoring the degradation of an organic dye (methylene blue (MB)) under UV-light irradiation, and in the gas-solid phase, by following the degradation of 2-propanol under UV and visible-light exposures. The synthesized titania powders not only exhibited excellent photocatalysis in the liquid-solid phase (under UV irradiation), but also possessed a superior PCA in the gas-solid phase under a visible-light exposure. The effects on the PCA of the very small crystalline domain size, surface composition and the presence of organic molecules due to the synthesis process of the TiO2 NPs were shown to account for this behaviour. |
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Non-aqueous sol-gel synthesis through a low-temperature solvothermal process of anatase showing visible-light photocatalytic activityTIO2 THIN-FILMTITANIUM-DIOXIDESURFACE-AREANANOCRYSTALLINE TIO2METHYLENE-BLUEWATERNANOPARTICLESDEGRADATIONPHASESEMICONDUCTORA novel, facile method based on a non-aqueous sol-gel solvothermal process has been developed to synthesise spherical TiO2 nanoparticles (NPs) in one pot. The reaction between titanium(IV) tert-butoxide (Ti[OC(CH3)(3)](4)) and benzyl alcohol was a simple process, which resulted in the formation of highly crystalline titania NPs with a small size of only 6 nm, and with a correspondingly high surface area. The chemical formation mechanism of the metal oxide NPs has been proposed, and the degree of surface hydroxyls (-OH groups) has been examined. The products of the synthesis were characterised by X-ray powder diffraction (XRPD) using the advanced whole powder pattern modelling (WPPM) method, high-resolution transmission electron microscopy (HR-TEM), thermo-gravimetric analysis (TGA), UV-visible diffuse reflectance spectroscopy (DRS), Fourier transform infrared spectroscopy (FT-IR), and nuclear magnetic resonance (NMR) spectroscopy. The photocatalytic activity (PCA) was evaluated in both the liquid-solid phase, by monitoring the degradation of an organic dye (methylene blue (MB)) under UV-light irradiation, and in the gas-solid phase, by following the degradation of 2-propanol under UV and visible-light exposures. The synthesized titania powders not only exhibited excellent photocatalysis in the liquid-solid phase (under UV irradiation), but also possessed a superior PCA in the gas-solid phase under a visible-light exposure. The effects on the PCA of the very small crystalline domain size, surface composition and the presence of organic molecules due to the synthesis process of the TiO2 NPs were shown to account for this behaviour.ROYAL SOC CHEMISTRY2017-12-07T19:26:13Z2014-01-01T00:00:00Z2014info:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/articleapplication/pdfhttp://hdl.handle.net/10773/19828eng2046-206910.1039/c4ra07214fKarmaoui, MohamedTobaldi, David M.Skapin, Andrijana SeverPullar, Robert C.Seabra, Maria P.Labrincha, Joao A.Amaral, Vitor. S.info: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:RCAAP2024-02-22T11:38:39Zoai:ria.ua.pt:10773/19828Portal AgregadorONGhttps://www.rcaap.pt/oai/openaireopendoar:71602024-03-20T02:54:33.835516Repositório 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 |
Non-aqueous sol-gel synthesis through a low-temperature solvothermal process of anatase showing visible-light photocatalytic activity |
title |
Non-aqueous sol-gel synthesis through a low-temperature solvothermal process of anatase showing visible-light photocatalytic activity |
spellingShingle |
Non-aqueous sol-gel synthesis through a low-temperature solvothermal process of anatase showing visible-light photocatalytic activity Karmaoui, Mohamed TIO2 THIN-FILM TITANIUM-DIOXIDE SURFACE-AREA NANOCRYSTALLINE TIO2 METHYLENE-BLUE WATER NANOPARTICLES DEGRADATION PHASE SEMICONDUCTOR |
title_short |
Non-aqueous sol-gel synthesis through a low-temperature solvothermal process of anatase showing visible-light photocatalytic activity |
title_full |
Non-aqueous sol-gel synthesis through a low-temperature solvothermal process of anatase showing visible-light photocatalytic activity |
title_fullStr |
Non-aqueous sol-gel synthesis through a low-temperature solvothermal process of anatase showing visible-light photocatalytic activity |
title_full_unstemmed |
Non-aqueous sol-gel synthesis through a low-temperature solvothermal process of anatase showing visible-light photocatalytic activity |
title_sort |
Non-aqueous sol-gel synthesis through a low-temperature solvothermal process of anatase showing visible-light photocatalytic activity |
author |
Karmaoui, Mohamed |
author_facet |
Karmaoui, Mohamed Tobaldi, David M. Skapin, Andrijana Sever Pullar, Robert C. Seabra, Maria P. Labrincha, Joao A. Amaral, Vitor. S. |
author_role |
author |
author2 |
Tobaldi, David M. Skapin, Andrijana Sever Pullar, Robert C. Seabra, Maria P. Labrincha, Joao A. Amaral, Vitor. S. |
author2_role |
author author author author author author |
dc.contributor.author.fl_str_mv |
Karmaoui, Mohamed Tobaldi, David M. Skapin, Andrijana Sever Pullar, Robert C. Seabra, Maria P. Labrincha, Joao A. Amaral, Vitor. S. |
dc.subject.por.fl_str_mv |
TIO2 THIN-FILM TITANIUM-DIOXIDE SURFACE-AREA NANOCRYSTALLINE TIO2 METHYLENE-BLUE WATER NANOPARTICLES DEGRADATION PHASE SEMICONDUCTOR |
topic |
TIO2 THIN-FILM TITANIUM-DIOXIDE SURFACE-AREA NANOCRYSTALLINE TIO2 METHYLENE-BLUE WATER NANOPARTICLES DEGRADATION PHASE SEMICONDUCTOR |
description |
A novel, facile method based on a non-aqueous sol-gel solvothermal process has been developed to synthesise spherical TiO2 nanoparticles (NPs) in one pot. The reaction between titanium(IV) tert-butoxide (Ti[OC(CH3)(3)](4)) and benzyl alcohol was a simple process, which resulted in the formation of highly crystalline titania NPs with a small size of only 6 nm, and with a correspondingly high surface area. The chemical formation mechanism of the metal oxide NPs has been proposed, and the degree of surface hydroxyls (-OH groups) has been examined. The products of the synthesis were characterised by X-ray powder diffraction (XRPD) using the advanced whole powder pattern modelling (WPPM) method, high-resolution transmission electron microscopy (HR-TEM), thermo-gravimetric analysis (TGA), UV-visible diffuse reflectance spectroscopy (DRS), Fourier transform infrared spectroscopy (FT-IR), and nuclear magnetic resonance (NMR) spectroscopy. The photocatalytic activity (PCA) was evaluated in both the liquid-solid phase, by monitoring the degradation of an organic dye (methylene blue (MB)) under UV-light irradiation, and in the gas-solid phase, by following the degradation of 2-propanol under UV and visible-light exposures. The synthesized titania powders not only exhibited excellent photocatalysis in the liquid-solid phase (under UV irradiation), but also possessed a superior PCA in the gas-solid phase under a visible-light exposure. The effects on the PCA of the very small crystalline domain size, surface composition and the presence of organic molecules due to the synthesis process of the TiO2 NPs were shown to account for this behaviour. |
publishDate |
2014 |
dc.date.none.fl_str_mv |
2014-01-01T00:00:00Z 2014 2017-12-07T19:26:13Z |
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://hdl.handle.net/10773/19828 |
url |
http://hdl.handle.net/10773/19828 |
dc.language.iso.fl_str_mv |
eng |
language |
eng |
dc.relation.none.fl_str_mv |
2046-2069 10.1039/c4ra07214f |
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 |
ROYAL SOC CHEMISTRY |
publisher.none.fl_str_mv |
ROYAL SOC CHEMISTRY |
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 |
|
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1799137598644420608 |