Determination of Cr(VI) in leather residues using graphite/paraffin composite electrodes modified with reduced graphene oxide nanosheets

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dc.contributor.authorOliveira, João P. J. de [UNESP]
dc.contributor.authorHiranobe, Carlos T. [UNESP]
dc.contributor.authorTorres, Giovanni B.
dc.contributor.authorSantos, Renivaldo J. dos [UNESP]
dc.contributor.authorPaim, Leonardo L. [UNESP]
dc.contributor.institutionUniversidade Estadual Paulista (UNESP)
dc.contributor.institutionUniversidade Estadual de Campinas (UNICAMP)
dc.contributor.institutionPrograma de Ingeniería de Diseño Industrial
dc.date.accessioned2023-03-01T20:41:30Z
dc.date.available2023-03-01T20:41:30Z
dc.date.issued2022-08-15
dc.description.abstractIn this study, we determined the Cr(VI) in samples of tanned leather residues by differential pulse voltammetry (DPV) using graphite/paraffin composite electrodes modified with reduced graphene oxide nanosheets (referred to as GPEs/nsRGO). After the modification, the composite electrodes were characterized by two electrochemical techniques (i.e., cyclic voltammetry, CV, and electrochemical impedance spectroscopy, EIS), scanning electron microscopy, and Raman spectroscopy. The electroanalytical method was applied using the GPEs/nsRGO. An analytical curve was obtained in a Clark-Lubs buffer solution (pH = 1), with a linear concentration range from 25.0 to 392.0 μmol L−1 and a limit of detection (LOD) of 1.01 μmol L−1. The GPEs/nsRGO showed good reproducibility in their manufacturing process and good response repeatability with an RSD of 4.59% over twelve measurements. These composite electrodes showed excellent selectivity, which was demonstrated by analyses in the presence of metal ions (Ca2+, Zn2+, Mg2+, Fe3+, Co2+, Na+, and Cu2+) that did not interfere in the analysis of Cr(VI). The GPEs/nsRGO were applied to the determination of Cr(VI) in real samples of wet-blue leather and leather ash using DPV. This approach was validated using the sample recovery method, where it presented values from 95.6 to 108.2%. The proposed method showed satisfactory results compared to the literature and can be considered a good alternative for the determination of Cr(VI) in aqueous samples.en
dc.description.affiliationSão Paulo State University (Unesp) Faculty of Engineering and Sciences, Campus Rosana, 1881 dos Barrageiros, Av., SP
dc.description.affiliationBrazilian Renewable Energies School of Electrical and Computer Engineering University of Campinas (Unicamp), Av. Albert Einstein 400, SP
dc.description.affiliationInstituto Tecnológico Metropolitano Programa de Ingeniería de Diseño Industrial, Antioquia
dc.description.affiliationUnespSão Paulo State University (Unesp) Faculty of Engineering and Sciences, Campus Rosana, 1881 dos Barrageiros, Av., SP
dc.description.sponsorshipConselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)
dc.description.sponsorshipFundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)
dc.description.sponsorshipIdCNPq: 138160/2020-1
dc.description.sponsorshipIdFAPESP: 2017/09123-9
dc.description.sponsorshipIdFAPESP: 2017/17559-1
dc.identifierhttp://dx.doi.org/10.1016/j.scitotenv.2022.155318
dc.identifier.citationScience of the Total Environment, v. 834.
dc.identifier.doi10.1016/j.scitotenv.2022.155318
dc.identifier.issn1879-1026
dc.identifier.issn0048-9697
dc.identifier.scopus2-s2.0-85129841077
dc.identifier.urihttp://hdl.handle.net/11449/240974
dc.language.isoeng
dc.relation.ispartofScience of the Total Environment
dc.sourceScopus
dc.subjectChromium(VI)
dc.subjectComposite electrodes
dc.subjectDifferential pulse voltammetry
dc.subjectReduced graphene oxide
dc.titleDetermination of Cr(VI) in leather residues using graphite/paraffin composite electrodes modified with reduced graphene oxide nanosheetsen
dc.typeArtigo

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