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Iridium nanostructured metal oxide, its inclusion in silica matrix and their activity toward photodegradation of methylene blue

dc.contributor.authorDiaz C.
dc.contributor.authorValenzuela M.L.
dc.contributor.authorCifuentes-Vaca O.
dc.contributor.authorSegovia M.
dc.contributor.authorLaguna-Bercero M.A.
dc.date.accessioned2020-09-02T22:16:44Z
dc.date.available2020-09-02T22:16:44Z
dc.date.issued2020
dc.identifier10.1016/j.matchemphys.2020.123276
dc.identifier.citation252, , -
dc.identifier.issn02540584
dc.identifier.urihttps://hdl.handle.net/20.500.12728/4315
dc.descriptionPrecious metal oxides of IrO2 were prepared by thermal treatment of the macromolecular Chitosan●(IrCl3)X and PSP-4-PVP●(IrCl3)X precursors. Using this procedure, pure IrO2, phases were formed. The nature of the polymeric precursor is acting as a solid state template and influences the size of the iridium dioxide but not significantly the morphology, and the obtained IrO2 nanoparticles are about 15 nm. For the first time, the photocatalytic degradation of methylene blue using IrO2 was measured founding a moderated activity. The inclusion of IrO2 into SiO2 was performed using a combined solution of the Chitosan and PVP precursors by the sol-gel method. Subsequent pyrolysis of the isolated solid-state Chitosan●(IrCl3)x(SiO2)y and PSP-4-PVP●(IrCl3)x(SiO2)y give rise to the IrO2//SiO2 nanocomposites. The IrO2 particles are distributed uniformly inside the matrix of SiO2 leading to stable semi porous materials appropriate for high temperature catalytic applications. The IrO2 nanoparticles formed from the PVP precursor are mainly nanobars of 10 nm width, while that for the chitosan precursor are around 25 nm. The IrO2/SiO2 composites exhibit a moderate photocatalytic activity toward the degradation of methylene blue and similar to that of IrO2. © 2020 Elsevier B.V.
dc.language.isoen
dc.publisherElsevier Ltd
dc.subjectChitosan
dc.subjectIridium oxide
dc.subjectPhotocatalysis
dc.subjectPolyvinylpyrrolidone
dc.subjectSilica
dc.subjectAromatic compounds
dc.subjectChitosan
dc.subjectHigh temperature applications
dc.subjectMetals
dc.subjectNanoparticles
dc.subjectPhotocatalytic activity
dc.subjectPorous materials
dc.subjectSilica
dc.subjectSilicon
dc.subjectSiO2 nanoparticles
dc.subjectSol-gel process
dc.subjectSol-gels
dc.subjectCatalytic applications
dc.subjectCombined solution
dc.subjectHigh temperature
dc.subjectIridium dioxide
dc.subjectNanostructured metals
dc.subjectPhoto catalytic degradation
dc.subjectPhotodegradation of methylene blue
dc.subjectPolymeric precursors
dc.subjectIridium compounds
dc.titleIridium nanostructured metal oxide, its inclusion in silica matrix and their activity toward photodegradation of methylene blue
dc.typeArticle


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