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Novel C-dots/titanate nanotubular hybrid materials with enhanced optical and photocatalytic properties

2023-03-05Journal article Restricted access
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dc.contributor.authorAlves, D. M.
dc.contributor.authorPrata, José Virgílio
dc.contributor.authorSilvestre, António Jorge
dc.contributor.authorMonteiro, O. C.
dc.date.accessioned2023-05-15T13:41:25Z
dc.date.available2023-05-15T13:41:25Z
dc.date.issued2023-03-05
dc.description.abstractAdvanced 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.pt_PT
dc.description.versioninfo:eu-repo/semantics/publishedVersionpt_PT
dc.identifier.citationALVES, 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.pt_PT
dc.identifier.doi10.1016/j.jallcom.2022.168143pt_PT
dc.identifier.eissn1873-4669
dc.identifier.issn0925-8388
dc.identifier.urihttp://hdl.handle.net/10400.21/16032
dc.language.isoengpt_PT
dc.peerreviewedyespt_PT
dc.publisherElsevierpt_PT
dc.relationUIDP/00100/2021 - FCTpt_PT
dc.relationUIDB/00100/2021 - FCTpt_PT
dc.relationUIDB/00616/2021pt_PT
dc.relationUIDP/00616/2021pt_PT
dc.relationPL/2017/C-dots/TNT/ISEL - Instituto Politécnico de Lisboapt_PT
dc.relation.publisherversionhttps://www.sciencedirect.com/science/article/pii/S0925838822045340?via%3Dihubpt_PT
dc.subjectTitanate nanotubes (TNT)pt_PT
dc.subjectCarbon dots (C -dots)pt_PT
dc.subjectHybrid C-dotspt_PT
dc.subjectTNT nanomaterialspt_PT
dc.subjectUrbach energypt_PT
dc.subjectCaffeine removalpt_PT
dc.subjectPhotocatalytic degradationpt_PT
dc.titleNovel C-dots/titanate nanotubular hybrid materials with enhanced optical and photocatalytic propertiespt_PT
dc.typejournal article
dspace.entity.typePublication
oaire.citation.endPage12pt_PT
oaire.citation.startPage1pt_PT
oaire.citation.titleJournal of Alloys and Compoundspt_PT
oaire.citation.volume936pt_PT
person.familyNamePrata
person.familyNameSilvestre
person.givenNameJosé Virgílio
person.givenNameAntónio Jorge
person.identifier191765
person.identifier.ciencia-idC11A-9130-8981
person.identifier.orcid0000-0002-9068-2847
person.identifier.orcid0000-0001-6517-6275
person.identifier.ridB-7214-2008
person.identifier.scopus-author-id9276778400
person.identifier.scopus-author-id25224208600
rcaap.rightsclosedAccesspt_PT
rcaap.typearticlept_PT
relation.isAuthorOfPublication15e229f3-a619-4931-87eb-799091dc1601
relation.isAuthorOfPublicationda27d795-d2eb-4f8c-bfa5-7053ef20f339
relation.isAuthorOfPublication.latestForDiscoveryda27d795-d2eb-4f8c-bfa5-7053ef20f339

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