Effect of polyvinyl alcohol on the shape, photoluminescence and photocatalytic properties of PbMoO4 microcrystals

Araújo, Vinícius Dantas; Tranquilin, Ricardo Luis; Motta, Fabiana Villela da; Paskocimas, Carlos Alberto; Bernardi, Maria Inês Basso; Cavalcante, L.S.; Andres, Juan; Silva, Elson Longo da; Delmonte, Maurício Roberto Bomio

Effect of polyvinyl alcohol on the shape, photoluminescence and photocatalytic properties of PbMoO4 microcrystals

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dc.contributor.author	Araújo, Vinícius Dantas
dc.contributor.author	Tranquilin, Ricardo Luis
dc.contributor.author	Motta, Fabiana Villela da
dc.contributor.author	Paskocimas, Carlos Alberto
dc.contributor.author	Bernardi, Maria Inês Basso
dc.contributor.author	Cavalcante, L.S.
dc.contributor.author	Andres, Juan
dc.contributor.author	Silva, Elson Longo da
dc.contributor.author	Delmonte, Maurício Roberto Bomio
dc.date.accessioned	2021-04-07T17:59:32Z
dc.date.available	2021-04-07T17:59:32Z
dc.date.issued	2014-10
dc.description.resumo	For this study, lead molybdate (PbMoO4) microcrystals were prepared by the co-precipitation method and processed using a conventional hydrothermal method at 100 °C for 10 min with polyvinyl alcohol (PVA) as the capping agent. These microcrystals were structurally characterized by X-ray diffraction (XRD) and micro-Raman spectroscopy, and their morphology was investigated by field-emission gun scanning electron microscopy (FEG-SEM). The optical properties were analyzed by ultraviolet–visible (UV–vis) absorption spectroscopy and photoluminescence (PL) measurements. XRD patterns and MR spectrum indicate that the PbMoO4 microcrystals have a scheelite-type tetragonal structure. FE-SEM images reveal that the PVA promotes the aggregation of several octahedrons and the formation of large porous stake-like PbMoO4 microcrystals which are related to the oriented attachment growth process. Moreover, the effect of the capping agent hinders the growth of a large amount of micro-octahedrons which can be verified with by several nanocrystals on large crystals. Intense green PL emission was observed at room temperature for PbMoO4 microcrystals which are related to structural defects at medium range and intermediary energy levels between the valence band (VB) and the conduction band (CB). Photocatalytic activity was observed for PbMoO4 as a catalyst in the degradation of the rhodamine B (RhB) dye, achieving total degradation after 90 min under UV-light	pt_BR
dc.identifier.citation	ARAÚJO, V.D.; TRANQUILIN, R.L.; MOTTA, F.V.; PASKOCIMAS, C.A.; BERNARDI, M.I.B.; CAVALCANTE, L.s.; ANDRES, J.; LONGO, E.; BOMIO, M.R.D.. Effect of polyvinyl alcohol on the shape, photoluminescence and photocatalytic properties of PbMoO4 microcrystals. Materials Science In Semiconductor Processing, [S.L.], v. 26, p. 425-430, out. 2014. Disponível em: https://www.sciencedirect.com/science/article/abs/pii/S1369800114002741?via%3Dihub. Acesso em: 11 fev. 2021. http://dx.doi.org/10.1016/j.mssp.2014.05.027.	pt_BR
dc.identifier.doi	10.1016/j.mssp.2014.05.027
dc.identifier.issn	1369-8001
dc.identifier.uri	https://repositorio.ufrn.br/handle/123456789/32082
dc.language	en	pt_BR
dc.publisher	Elsevier	pt_BR
dc.rights	Attribution 3.0 Brazil	*
dc.rights.uri	http://creativecommons.org/licenses/by/3.0/br/	*
dc.subject	PbMoO4	pt_BR
dc.subject	Photocatalysis	pt_BR
dc.subject	Hydrothermal	pt_BR
dc.subject	PVA	pt_BR
dc.subject	Rhodamine B	pt_BR
dc.subject	Microcrystals	pt_BR
dc.title	Effect of polyvinyl alcohol on the shape, photoluminescence and photocatalytic properties of PbMoO4 microcrystals	pt_BR
dc.type	article	pt_BR