Stabilization of the γ-Ag2WO4 metastable pure phase by coprecipitation method using polyvinylpyrrolidone as surfactant: photocatalytic property
| dc.contributor.author | Andrade Neto, Nivaldo Freire de | |
| dc.contributor.author | Silva, J.M.P. | |
| dc.contributor.author | Tranquilin, Ricardo Luis | |
| dc.contributor.author | Silva, Elson Longo da | |
| dc.contributor.author | Delmonte, Maurício Roberto Bomio | |
| dc.contributor.author | Motta, Fabiana Villela da | |
| dc.date.accessioned | 2021-09-24T13:39:54Z | |
| dc.date.issued | 2020-07 | |
| dc.description.embargo | 2030-12 | |
| dc.description.resumo | In this work, the effect of polyvinylpyrrolidone (PVP) concentration as a surfactant was studied in the estabilization of the metastable phase γ-Ag2WO4 by the coprecipitation method at room temperature. The phases obtained were characterized by X-ray diffraction (XRD), Raman spectroscopy, scanning electron microscopy (SEM), transmission electron microscopy (TEM) and spectroscopy in the ultraviolet–visible region (UV–Vis). The pho-tocatalytic activity was estimated by varying the concentration of methylene blue dye. The iffractograms in-dicate that 0.3 g of PVP is ideal for obtaining the single phase of γ-Ag2WO4, as larger or maller amounts favor the appearance of β-Ag2WO4 as a secondary phase while the absence of PVP formed he α-Ag2WO4 phase. UV–Vis spectroscopy showed that both phases have absorption in the ultraviolet region, here the γ-Ag2WO4 phase has a higher absorption at shorter wavelengths. The micrographs indicate that the -g2WO4 morphology is formed by rods, while the γ-Ag2WO4 is formed by octahedrons, both in micrometer cale and with well-defined morphology. The photocatalytic tests indicate that the γ-Ag2WO4 phase has better photocatalytic activity compared to the β-Ag2WO4 phase. The scavenger's methodology indicated that h+ charges are the main mechanism in the photocatalysis of methylene blue dye | pt_BR |
| dc.identifier.citation | ANDRADE NETO, N.F.; SILVA, J.M.P.; TRANQUILIN, R.L.; LONGO, E.; BOMIO, M.R.D.; MOTTA, F.V.. Stabilization of the γ-Ag2WO4 metastable pure phase by coprecipitation method using polyvinylpyrrolidone as surfactant: photocatalytic property. Ceramics International, [S.L.], v. 46, n. 10, p. 14864-14871, jul. 2020. Disponível em: https://www.sciencedirect.com/science/article/pii/S0272884220306301?via%3Dihub. Acesso em: 20 abr. 2021. http://dx.doi.org/10.1016/j.ceramint.2020.03.012. | pt_BR |
| dc.identifier.doi | 10.1016/j.ceramint.2020.03.012 | |
| dc.identifier.issn | 0272-8842 | |
| dc.identifier.uri | https://repositorio.ufrn.br/handle/123456789/38009 | |
| dc.language | en | pt_BR |
| dc.publisher | Elsevier | pt_BR |
| dc.subject | Polyvinylpyrrolidone | pt_BR |
| dc.subject | Metastable phases | pt_BR |
| dc.subject | γ-Ag2WO4 | pt_BR |
| dc.subject | β-Ag2WO4 | pt_BR |
| dc.subject | Photocatalysis | pt_BR |
| dc.title | Stabilization of the γ-Ag2WO4 metastable pure phase by coprecipitation method using polyvinylpyrrolidone as surfactant: photocatalytic property | pt_BR |
| dc.type | article | pt_BR |
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