A study of the precursors and photoactivity of nanostructures of Ti oxides synthesized by the alkaline hydrothermal method

dc.creatorMourão, Henrique A. J. L.
dc.creatorAvansi, Waldir
dc.creatorOliveira, Juliano E.
dc.creatorFirmiano, Edney S.
dc.creatorRibeiro, Caue
dc.date2020-01-28T19:02:01Z
dc.date2020-01-28T19:02:01Z
dc.date2013-01
dc.date.accessioned2023-09-28T19:59:01Z
dc.date.available2023-09-28T19:59:01Z
dc.identifierMOURÃO, H. A. J. L. et al. A study of the precursors and photoactivity of nanostructures of Ti oxides synthesized by the alkaline hydrothermal method. Science of Advanced Materials, [S.l.], v. 5, n. 1, p. 71-85, Jan. 2013.
dc.identifierhttps://www.ingentaconnect.com/content/asp/sam/2013/00000005/00000001/art00011?crawler=true&mimetype=application/pdf
dc.identifierhttp://repositorio.ufla.br/jspui/handle/1/38744
dc.identifier.urihttps://repositorioslatinoamericanos.uchile.cl/handle/2250/9041625
dc.descriptionThe present study describes the synthesis, characterization and photocatalytic potential of Ti oxide nanostructures of various morphologies and crystalline phases that were synthesized from 4 different precursors by the alkaline hydrothermal method. The materials were characterized by mainly X-ray diffraction (XRD), Raman spectroscopy, scanning and transmission electron microscopy (SEM and TEM), thermogravimetric analysis (TGA) and X-ray absorption spectroscopy (XAS). Also, photocatalytic potential was assessed by rhodamine B photodegradation. The materials obtained from peroxytitanium complexes (PTCs) exhibited a strong dependence on the concentration of KOH ([KOH]) used for synthesis. The pre-formed sheets of the PTCs were critical to the formation of nanostructures such as nanoribbons, and they were also compatible with the rolling up process, which can be utilized to form structures such as nanorods, nanowires or nanotubes. In the rhodamine photodegradation tests, TiO2 anatase nanostructures with six-coordinated Ti were more effective than the titanate ones (five-coordinated), despite having a smaller surface area and fewer OH groups. The lower photoactivity of the titanates was attributed to the presence of five-coordinated titanium species (TiO5), which may act as electron–hole recombination centers. Furthermore, the material with a mixture of TiO2/titanate was shown to be promising for photocatalytic applications.
dc.languageen_US
dc.publisherIngenta
dc.rightsrestrictAccess
dc.sourceScience of Advanced Materials
dc.subjectHydrothermal synthesis
dc.subjectMultilayered structure
dc.subjectPeroxytitanium complex
dc.subjectPhotocatalysis
dc.titleA study of the precursors and photoactivity of nanostructures of Ti oxides synthesized by the alkaline hydrothermal method
dc.typeArtigo


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