Novel C-dots/titanate nanotubular hybrid materials with enhanced optical and photocatalytic properties
Autor(a) principal: | |
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Data de Publicação: | 2023 |
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/10400.21/16032 |
Resumo: | Advanced nanomaterials with enhanced optical and photocatalytic properties for the photodegradation of organic pollutants, in particular pharmaceuticals and personal care products (PPCPs), were successfully prepared by a swift one-pot synthesis. Nanostructured materials were synthesized through an integrated hydrothermal procedure which generates titanate nanotubes (TNTs) with different carbon dots (C-dots) contents, from an amorphous titanium oxide-based source and cork industry wastewaters (CIWW) as carbon source. Their structural, microstructural, morphological, and optical properties were studied by XRD, TEM, XPS, UV-Vis diffuse reflectance and photoluminescence spectroscopies. As aimed, the hybrid C-dots/ TNT nanomaterials extend their light absorption towards the red, in comparison to pristine TNT, prompting them for a more efficient use of light in photocatalysis by widening the TNT energy uptake range. The decrease of bandgap energy with increasing sample's C-dots content seems to be originated from energy intermediate states formed within the TNTs' forbidden band resulting from Ti-O-C bonds established between the TNTs and the C-dots that form tails of states.The as-synthesized C-dots/TNT samples were tested in the photodegradation of caffeine as a pollutant model for PPCPs. Rewarding results were obtained, with the hybrid C-dots/TNT nanomaterials showing significant enhanced photocatalytic ability toward caffeine degradation in comparison to pristine TNTs. Photocatalysis assays in the presence of scavengers and/or in the absence of oxygen were also performed aiming to characterize the most reactive species formed during the semiconductor photo-activation process and thus assessing to possible reactive pathways underpinning the photocatalytic activity of the hybrid C-dots/TNT nanomaterials. |
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Novel C-dots/titanate nanotubular hybrid materials with enhanced optical and photocatalytic propertiesTitanate nanotubes (TNT)Carbon dots (C -dots)Hybrid C-dotsTNT nanomaterialsUrbach energyCaffeine removalPhotocatalytic degradationAdvanced nanomaterials with enhanced optical and photocatalytic properties for the photodegradation of organic pollutants, in particular pharmaceuticals and personal care products (PPCPs), were successfully prepared by a swift one-pot synthesis. Nanostructured materials were synthesized through an integrated hydrothermal procedure which generates titanate nanotubes (TNTs) with different carbon dots (C-dots) contents, from an amorphous titanium oxide-based source and cork industry wastewaters (CIWW) as carbon source. Their structural, microstructural, morphological, and optical properties were studied by XRD, TEM, XPS, UV-Vis diffuse reflectance and photoluminescence spectroscopies. As aimed, the hybrid C-dots/ TNT nanomaterials extend their light absorption towards the red, in comparison to pristine TNT, prompting them for a more efficient use of light in photocatalysis by widening the TNT energy uptake range. The decrease of bandgap energy with increasing sample's C-dots content seems to be originated from energy intermediate states formed within the TNTs' forbidden band resulting from Ti-O-C bonds established between the TNTs and the C-dots that form tails of states.The as-synthesized C-dots/TNT samples were tested in the photodegradation of caffeine as a pollutant model for PPCPs. Rewarding results were obtained, with the hybrid C-dots/TNT nanomaterials showing significant enhanced photocatalytic ability toward caffeine degradation in comparison to pristine TNTs. Photocatalysis assays in the presence of scavengers and/or in the absence of oxygen were also performed aiming to characterize the most reactive species formed during the semiconductor photo-activation process and thus assessing to possible reactive pathways underpinning the photocatalytic activity of the hybrid C-dots/TNT nanomaterials.ElsevierRCIPLAlves, D. M.Prata, José VirgílioSilvestre, António JorgeMonteiro, O. C.2023-05-15T13:41:25Z2023-03-052023-03-05T00:00:00Zinfo:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/articleapplication/pdfhttp://hdl.handle.net/10400.21/16032engALVES, D. M..; [et al] – Novel C-dots/titanate nanotubular hybrid materials with enhanced optical and photocatalytic properties. Journal of Alloys and Compounds. ISSN 0925-8388. Vol. 936 (2023), pp. 1-12.0925-838810.1016/j.jallcom.2022.1681431873-4669metadata only accessinfo: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:RCAAP2023-08-03T10:14:15ZPortal AgregadorONG |
dc.title.none.fl_str_mv |
Novel C-dots/titanate nanotubular hybrid materials with enhanced optical and photocatalytic properties |
title |
Novel C-dots/titanate nanotubular hybrid materials with enhanced optical and photocatalytic properties |
spellingShingle |
Novel C-dots/titanate nanotubular hybrid materials with enhanced optical and photocatalytic properties Alves, D. M. Titanate nanotubes (TNT) Carbon dots (C -dots) Hybrid C-dots TNT nanomaterials Urbach energy Caffeine removal Photocatalytic degradation |
title_short |
Novel C-dots/titanate nanotubular hybrid materials with enhanced optical and photocatalytic properties |
title_full |
Novel C-dots/titanate nanotubular hybrid materials with enhanced optical and photocatalytic properties |
title_fullStr |
Novel C-dots/titanate nanotubular hybrid materials with enhanced optical and photocatalytic properties |
title_full_unstemmed |
Novel C-dots/titanate nanotubular hybrid materials with enhanced optical and photocatalytic properties |
title_sort |
Novel C-dots/titanate nanotubular hybrid materials with enhanced optical and photocatalytic properties |
author |
Alves, D. M. |
author_facet |
Alves, D. M. Prata, José Virgílio Silvestre, António Jorge Monteiro, O. C. |
author_role |
author |
author2 |
Prata, José Virgílio Silvestre, António Jorge Monteiro, O. C. |
author2_role |
author author author |
dc.contributor.none.fl_str_mv |
RCIPL |
dc.contributor.author.fl_str_mv |
Alves, D. M. Prata, José Virgílio Silvestre, António Jorge Monteiro, O. C. |
dc.subject.por.fl_str_mv |
Titanate nanotubes (TNT) Carbon dots (C -dots) Hybrid C-dots TNT nanomaterials Urbach energy Caffeine removal Photocatalytic degradation |
topic |
Titanate nanotubes (TNT) Carbon dots (C -dots) Hybrid C-dots TNT nanomaterials Urbach energy Caffeine removal Photocatalytic degradation |
description |
Advanced nanomaterials with enhanced optical and photocatalytic properties for the photodegradation of organic pollutants, in particular pharmaceuticals and personal care products (PPCPs), were successfully prepared by a swift one-pot synthesis. Nanostructured materials were synthesized through an integrated hydrothermal procedure which generates titanate nanotubes (TNTs) with different carbon dots (C-dots) contents, from an amorphous titanium oxide-based source and cork industry wastewaters (CIWW) as carbon source. Their structural, microstructural, morphological, and optical properties were studied by XRD, TEM, XPS, UV-Vis diffuse reflectance and photoluminescence spectroscopies. As aimed, the hybrid C-dots/ TNT nanomaterials extend their light absorption towards the red, in comparison to pristine TNT, prompting them for a more efficient use of light in photocatalysis by widening the TNT energy uptake range. The decrease of bandgap energy with increasing sample's C-dots content seems to be originated from energy intermediate states formed within the TNTs' forbidden band resulting from Ti-O-C bonds established between the TNTs and the C-dots that form tails of states.The as-synthesized C-dots/TNT samples were tested in the photodegradation of caffeine as a pollutant model for PPCPs. Rewarding results were obtained, with the hybrid C-dots/TNT nanomaterials showing significant enhanced photocatalytic ability toward caffeine degradation in comparison to pristine TNTs. Photocatalysis assays in the presence of scavengers and/or in the absence of oxygen were also performed aiming to characterize the most reactive species formed during the semiconductor photo-activation process and thus assessing to possible reactive pathways underpinning the photocatalytic activity of the hybrid C-dots/TNT nanomaterials. |
publishDate |
2023 |
dc.date.none.fl_str_mv |
2023-05-15T13:41:25Z 2023-03-05 2023-03-05T00:00:00Z |
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/10400.21/16032 |
url |
http://hdl.handle.net/10400.21/16032 |
dc.language.iso.fl_str_mv |
eng |
language |
eng |
dc.relation.none.fl_str_mv |
ALVES, D. M..; [et al] – Novel C-dots/titanate nanotubular hybrid materials with enhanced optical and photocatalytic properties. Journal of Alloys and Compounds. ISSN 0925-8388. Vol. 936 (2023), pp. 1-12. 0925-8388 10.1016/j.jallcom.2022.168143 1873-4669 |
dc.rights.driver.fl_str_mv |
metadata only access info:eu-repo/semantics/openAccess |
rights_invalid_str_mv |
metadata only access |
eu_rights_str_mv |
openAccess |
dc.format.none.fl_str_mv |
application/pdf |
dc.publisher.none.fl_str_mv |
Elsevier |
publisher.none.fl_str_mv |
Elsevier |
dc.source.none.fl_str_mv |
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Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informação |
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RCAAP |
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RCAAP |
reponame_str |
Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) |
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Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) |
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