Bifunctional oxidase-peroxidase inorganic nanozyme catalytic cascade for wastewater remediation

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dc.creatorAlexandra Ancelmo Piscitelli Mansur
dc.creatorAlice Gameiro Leonel
dc.creatorKlaus Wilhelm Heinrich Krambrock
dc.creatorHerman Sander Mansur
dc.date.accessioned2025-02-24T18:30:17Z
dc.date.accessioned2025-09-09T00:37:07Z
dc.date.available2025-02-24T18:30:17Z
dc.date.issued2021
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.sponsorshipFINEP - Financiadora de Estudos e Projetos, Financiadora de Estudos e Projetos
dc.identifier.doihttps://doi.org/10.1016/j.cattod.2021.11.018
dc.identifier.issn1873-4308
dc.identifier.urihttps://hdl.handle.net/1843/80365
dc.languageeng
dc.publisherUniversidade Federal de Minas Gerais
dc.relation.ispartofCatalysis Today
dc.rightsAcesso Restrito
dc.subjectNanomateriais
dc.subjectNanopartículas
dc.subjectEnzimas
dc.subject.otherNanocatalyst
dc.subject.otherNanomaterial for catalysis
dc.subject.otherNanozyme cascade
dc.subject.otherPeroxidase-like activity
dc.subject.otherOxidase-like activity
dc.subject.otherBifunctional oxidase-peroxidase nanozyme
dc.titleBifunctional oxidase-peroxidase inorganic nanozyme catalytic cascade for wastewater remediation
dc.typeArtigo de periódico
local.citation.epage144
local.citation.spage129
local.citation.volume397-399
local.description.resumoNanozymes are inorganic nanoparticles with enzyme-like features. Noble metals and metal oxide-based nanomaterials can present enzyme-mimicking behavior mediating catalytic reactions including oxidase-, peroxidase-, catalase-, and superoxide dismutase-like activities with important applications in environmental and biomedical grounds. Thus, in this study, it was designed and developed a novel nanosystem that exploits the oxidase-like (OD) behavior of gold nanoparticles (AuNPs, GOLDzyme) and the peroxidase-like (POD) characteristics of cobalt-doped magnetic iron oxide nanoparticles (MIONs, Co-MIONzyme) amalgamated in an inorganic-inorganic bi-nanozyme cascade for the degradation of dye pollutants. GOLDzyme and Co-MIONzyme nanomaterials were synthesized and stabilized by citrate and carboxymethylcellulose (CMC) ligands, respectively, using a green aqueous colloidal process at mild conditions. The physicochemical characterization results indicated that waterdispersible colloidal supramolecular nanostructures were effectively produced, with core-shell morphologies (i. e., inorganic nanoparticle core/organic-shell). The AuNPs (GOLDzyme) presented crystalline nanostructure, with a uniform spherical shape, zeta potential (ZP) = - 46 ± 3 mV, hydrodynamic diameter (DH) = 11 ± 3 nm. Analogously, the Co-MIONzyme stabilized by CMC ligand evidenced the formation of nanocrystalline substituted magnetite (CoxFe3− xO4) with uniform spherical morphology, average size = 7.0 ± 2 nm, ZP = - 47 ± 3 mV, DH = 46 ± 3 nm, and superparamagnetic behavior. When tested separately using a colorimetric assay based on a chromogenic molecule (3,3′,5,5′ tetramethylbenzidine, TMB), they demonstrated catalytic activity upon the injection of each specific substrate in the medium, i.e., glucose for GOLDzyme that behaved predominantly as oxidase-like nanomaterial, and H2O2 for Co-MIONzyme, which showed a peroxidase-like or catalase-like behavior. In addition, these nanozymes demonstrated pH-dependent and temperature-dependent catalytic activities. As a proof of concept, when combined into a single-pot reaction system, these bifunctional nanozymes confirmed integrated catalytic cascade as oxidase and peroxidase-like nanocatalysts towards the oxidation of TMB and the degradation of methylene blue (MB, ~18%) as the model dye pollutant. Based on the preliminary encouraging results of this research, it can be foreseen that the combination of nanozymes paves the way for the development of new nanoplatforms for prospective applications in water treatment and environmental remediation.
local.identifier.orcidhttps://orcid.org/0000-0003-1526-2508
local.identifier.orcidhttps://orcid.org/0000-0002-8798-4182
local.identifier.orcidhttps://orcid.org/0000-0002-7562-0285
local.identifier.orcidhttps://orcid.org/0000-0002-3032-495X
local.publisher.countryBrasil
local.publisher.departmentENG - DEPARTAMENTO DE ENGENHARIA METALÚRGICA
local.publisher.departmentICX - DEPARTAMENTO DE FÍSICA
local.publisher.initialsUFMG
local.url.externahttps://www.sciencedirect.com/science/article/pii/S0920586121004983?via%3Dihub

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