Growth mechanism and photocatalytic properties of SrWO4 microcrystals synthesized by injection of ions into a hot aqueous solution

dc.contributorUniversidade Estadual Paulista (UNESP)
dc.creatorCavalcante, L. S.
dc.creatorSczancoski, J. C.
dc.creatorBatista, N. C.
dc.creatorLongo, Elson
dc.creatorVarela, José Arana
dc.creatorOrlandi, Marcelo Ornaghi
dc.date2014-05-27T11:27:28Z
dc.date2016-10-25T18:40:53Z
dc.date2014-05-27T11:27:28Z
dc.date2016-10-25T18:40:53Z
dc.date2013-01-01
dc.date.accessioned2017-04-06T02:07:00Z
dc.date.available2017-04-06T02:07:00Z
dc.identifierAdvanced Powder Technology, v. 24, n. 1, p. 344-353, 2013.
dc.identifier0921-8831
dc.identifier1568-5527
dc.identifierhttp://hdl.handle.net/11449/74158
dc.identifierhttp://acervodigital.unesp.br/handle/11449/74158
dc.identifier10.1016/j.apt.2012.08.007
dc.identifierWOS:000312472200049
dc.identifier2-s2.0-84870526938
dc.identifierhttp://dx.doi.org/10.1016/j.apt.2012.08.007
dc.identifier.urihttp://repositorioslatinoamericanos.uchile.cl/handle/2250/894931
dc.descriptionThis paper reports our initial research to obtain SrWO4 microcrystals by the injection of ions into a hot aqueous solution and their photocatalytic (PC) properties. These microcrystals were structurally characterized by X-ray diffraction (XRD), Rietveld refinements and Fourier transform (FT)-Raman spectroscopy. The shape and average size of these SrWO 4 microcrystals were observed by field emission scanning electron microscopy (FE-SEM) and transmission electron microscopy (TEM). In addition, we have investigated the PC activity of microcrystals for the degradation of rhodamine B (RhB) and rhodamine 6G (Rh6G) dyes. XRD patterns, Rietveld refinement data and FT-Raman spectroscopy confirmed that SrWO4 microcrystals have a scheelite-type tetragonal structure without deleterious phases. FT-Raman spectra exhibited 12 Raman-active modes in a range from 50 to 1000 cm-1. FE-SEM and TEM images suggested that the SrWO4 microcrystals (rice-like - 95%; star-, flower-, and urchin-like - 5%) were formed by means of primary/secondary nucleation events and self-assembly processes. Based on these FE-SEM/TEM images, a crystal growth mechanism was proposed and discussed in details in this work. Finally, a good PC activity was first discovered of the SrWO4 microcrystals for the degradation of RhB after 80 min and Rh6G after 50 min dyes under ultraviolet-light, respectively. © 2012 The Society of Powder Technology Japan. Published by Elsevier B.V. and The Society of Powder.
dc.languageeng
dc.relationAdvanced Powder Technology
dc.rightsinfo:eu-repo/semantics/closedAccess
dc.subjectHot-injection
dc.subjectPhotocatalysis
dc.subjectRhodamine
dc.subjectRietveld refinement
dc.subjectSrWO4
dc.subjectAverage size
dc.subjectCrystal growth mechanism
dc.subjectField emission scanning electron microscopy
dc.subjectFT- Raman spectroscopy
dc.subjectFT-Raman spectrum
dc.subjectGrowth mechanisms
dc.subjectPhoto-catalytic
dc.subjectPhotocatalytic property
dc.subjectRaman active modes
dc.subjectRhodamine 6G
dc.subjectRhodamine B
dc.subjectSelf assembly process
dc.subjectTEM images
dc.subjectTetragonal structure
dc.subjectTransmission electron microscopy tem
dc.subjectUrchin-like
dc.subjectXRD patterns
dc.subjectCrystal growth
dc.subjectField emission microscopes
dc.subjectRaman spectroscopy
dc.subjectSolutions
dc.subjectTransmission electron microscopy
dc.subjectTungstate minerals
dc.subjectX ray diffraction
dc.subjectMicrocrystals
dc.titleGrowth mechanism and photocatalytic properties of SrWO4 microcrystals synthesized by injection of ions into a hot aqueous solution
dc.typeOtro


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