Effect of the carbon loading on the structural and photocatalytic properties of reduced graphene oxide-TiO2 nanocomposites prepared by hydrothermal synthesis

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dc.creatorBruno de Souza Gonçalves
dc.creatorManuel Noel Paul Georges Houmard
dc.creatorEduardo Henrique Martins Nunes
dc.creatorHugo Guimarães Palhares
dc.creatorTarcizo da Cruz Costa de Souza
dc.creatorVinícius Gomide de Castro
dc.creatorGlaura Goulart Silva
dc.creatorBruno Cordeiro Silva
dc.creatorKlaus Wilhelm Heinrich Krambrock
dc.creatorRenata Braga Soares
dc.creatorVanessa de Freitas Cunha Lins
dc.date.accessioned2022-11-04T12:54:46Z
dc.date.accessioned2025-09-09T00:10:58Z
dc.date.available2022-11-04T12:54:46Z
dc.date.issued2019
dc.description.sponsorshipCNPq - Conselho Nacional de Desenvolvimento Científico e Tecnológico
dc.description.sponsorshipFAPEMIG - Fundação de Amparo à Pesquisa do Estado de Minas Gerais
dc.description.sponsorshipCAPES - Coordenação de Aperfeiçoamento de Pessoal de Nível Superior
dc.description.sponsorshipINCT – Instituto nacional de ciência e tecnologia (Antigo Instituto do Milênio)
dc.format.mimetypepdf
dc.identifier.doihttps://doi.org/10.1016/j.jmrt.2019.10.020
dc.identifier.issn22387854
dc.identifier.urihttps://hdl.handle.net/1843/46908
dc.languageeng
dc.publisherUniversidade Federal de Minas Gerais
dc.relation.ispartofJournal of Materials Research and Technology - JMR & T
dc.rightsAcesso Aberto
dc.subjectGrafeno
dc.subjectÓxido de grafeno
dc.subjectDióxido de titânio
dc.subject.otherReduced graphene oxide
dc.subject.otherTin dioxide
dc.subject.otherTitania
dc.subject.otherSol-gel process
dc.subject.otherPhotocatalytic evaluation
dc.titleEffect of the carbon loading on the structural and photocatalytic properties of reduced graphene oxide-TiO2 nanocomposites prepared by hydrothermal synthesis
dc.typeArtigo de periódico
local.citation.epage6274
local.citation.issue6
local.citation.spage6262
local.citation.volume8
local.description.resumoThis work deals with the preparation of reduced graphene oxide (RGO)-TiO2 composites by a one-step hydrothermal treatment. The effect of the RGO loading on both the structural properties and photocatalytic behavior of RGO-TiO2 is deeply addressed herein. The hydrothermal treatment promoted the reduction of graphene oxide, crystallization of TiO2 into anatase, and anchoring of TiO2 nanoparticles on RGO sheets. It was observed that the prepared anatase particles showed sizes below 10 nm, whereas the RGO sheets displayed thicknesses smaller than 1 nm. The use of RGO at concentrations up to 15 wt% greatly increased the specific surface area of RGO-TiO2. It was demonstrated that the combination of RGO and TiO2 gives rise to materials with improved photocatalytic properties and tailored structural properties. The composite with the highest photoactivity was the one containing an RGO loading of 1 wt%; this composite displayed a photocatalytic rate constant about 9.5 times higher than that evaluated for pure TiO2. This behavior may be related to the stacking of RGO nanosheets when its concentration is above 1 wt%. Moreover, the addition of RGO in excess may prevent the activation of the TiO2 surface by UV light and also decrease the lifetime of the photogenerated electron-hole pairs. Therefore, it appears that 1 wt% is the optimal loading of RGO to obtain a close interfacial contact between RGO and TiO2, leading to both an effective activation of TiO2 by UV radiation and an enhanced charge transfer between RGO and TiO2.
local.identifier.orcidhttps://orcid.org/0000-0002-1543-5416
local.identifier.orcidhttps://orcid.org/0000-0001-6813-2999
local.identifier.orcidhttps://orcid.org/0000-0001-6437-0009
local.identifier.orcidhttps://orcid.org/0000-0002-0308-0179
local.identifier.orcidhttps://orcid.org/0000-0002-0873-1671
local.identifier.orcidhttps://orcid.org/0000-0002-7562-0285
local.identifier.orcidhttps://orcid.org/0000-0002-6357-9553
local.publisher.countryBrasil
local.publisher.departmentENG - DEPARTAMENTO DE ENGENHARIA METALÚRGICA
local.publisher.departmentENG - DEPARTAMENTO DE ENGENHARIA QUÍMICA
local.publisher.departmentICX - DEPARTAMENTO DE FÍSICA
local.publisher.departmentICX - DEPARTAMENTO DE QUÍMICA
local.publisher.initialsUFMG
local.url.externahttps://www.sciencedirect.com/science/article/pii/S2238785419302613#!

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