Synthesis and Characterization of Mesoporous Silica Modified with Purpald and Its Application in the Preconcentration of Cu2+ and Cd2+ from Aqueous Samples through Solid-Phase Extraction

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dc.contributor.authorWondracek, Marcos Henrique Pereira
dc.contributor.authorJorgetto, Alexandre de Oliveira [UNESP]
dc.contributor.authorda Silva, Adrielli Cristina Peres [UNESP]
dc.contributor.authorSchneider, José Fabián
dc.contributor.authorPedrosa, Valber de Albuquerque [UNESP]
dc.contributor.authorSaeki, Margarida Juri [UNESP]
dc.contributor.authorde Castro, Gustavo Rocha [UNESP]
dc.contributor.institutionUniversity of Grande Dourados
dc.contributor.institutionUniversidade Estadual Paulista (UNESP)
dc.contributor.institutionUniversidade de São Paulo (USP)
dc.date.accessioned2023-07-29T13:43:28Z
dc.date.available2023-07-29T13:43:28Z
dc.date.issued2023-02-01
dc.description.abstractThe synthesis of an organofunctionalized mesoporous silica was accomplished by a two-step process involving (1) the co-condensation of a silylant agent at the surface of silica, followed by (2) the immobilization of Purpald (ligand) at the organic termination of the silytant agent. The characterization of the organofunctionalized material indicated the presence of NH2 groups, and the immobilization of the ligand was confirmed by 29Si- and 13C-nuclear magnetic resonance. The material’s surface area was determined as 370 m2 g−1. Batch adsorption experiments enabled the determination of optimum pH conditions for the adsorption of Cu(II) and Cd(II). Under optimal pH, the pseudo-second-order kinetic model and Langmuir model provided the best correlations to describe the materials adsorption behavior, suggesting a chemisorption mechanism. When tested in continuous-flow preconcentration experiments, the flow rate and eluent concentration demonstrated to affect the removal of Cu(II) and Cd(II), while the buffer concentration had an effect only over the adsorption of Cu(II). Under optimized preconcentration conditions, it was possible both to determine the concentrations of Cu(II) and Cd(II) in samples such as mineral water, ground water, tap water and river water. Ions commonly found in drinking and natural waters (Na+, K+, Ca2+, Mg2+, Fe3+, Ba2+, Cl−, SO42−, HCO3−, and H2PO4−) did not affect the preconcentration of any of the studied analytes. Reutilization experiments indicated that the adsorbent material can withstand at least 40 adsorption/desorption preconcentration cycles with no efficiency loss.en
dc.description.affiliationFaculty of Science and Technology University of Grande Dourados, Rodovia Dourados-Itahum, km 12, MS
dc.description.affiliationInterdisciplinary Laboratory of Nanostructures and Semiconductors (LINSE-IQ-UNESP), Rua Francisco Degni, 55, SP
dc.description.affiliationChemistry and Biochemistry Department Institute of Biosciences of Botucatu-UNESP, C.P. 510, SP
dc.description.affiliationInstituto de Física de São Carlos (IFSC) Universidade de São Paulo (USP), SP
dc.description.affiliationUnespInterdisciplinary Laboratory of Nanostructures and Semiconductors (LINSE-IQ-UNESP), Rua Francisco Degni, 55, SP
dc.description.affiliationUnespChemistry and Biochemistry Department Institute of Biosciences of Botucatu-UNESP, C.P. 510, SP
dc.description.sponsorshipUniversidade Estadual Paulista
dc.description.sponsorshipFundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)
dc.description.sponsorshipConselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)
dc.description.sponsorshipIdFAPESP: 2015/04791-8
dc.description.sponsorshipIdFAPESP: 2018/18787-0
dc.description.sponsorshipIdCNPq: 312361/2021-1
dc.identifierhttp://dx.doi.org/10.3390/separations10020108
dc.identifier.citationSeparations, v. 10, n. 2, 2023.
dc.identifier.doi10.3390/separations10020108
dc.identifier.issn2297-8739
dc.identifier.scopus2-s2.0-85148876835
dc.identifier.urihttp://hdl.handle.net/11449/248418
dc.language.isoeng
dc.relation.ispartofSeparations
dc.sourceScopus
dc.subjectadsorption
dc.subjectpreconcentration
dc.subjectsolid-phase extraction
dc.subjecttoxic metals
dc.titleSynthesis and Characterization of Mesoporous Silica Modified with Purpald and Its Application in the Preconcentration of Cu2+ and Cd2+ from Aqueous Samples through Solid-Phase Extractionen
dc.typeArtigo
unesp.author.orcid0000-0001-5992-2788[4]

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