Effect of polyvinyl alcohol on the shape, photoluminescence and photocatalytic properties of PbMoO4 microcrystals
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 (...
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ri-123456789-320822021-10-04T20:13:11Z 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 PbMoO4 Photocatalysis Hydrothermal PVA Rhodamine B Microcrystals 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 2021-04-07T17:59:32Z 2021-04-07T17:59:32Z 2014-10 article 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. 1369-8001 https://repositorio.ufrn.br/handle/123456789/32082 10.1016/j.mssp.2014.05.027 en Attribution 3.0 Brazil http://creativecommons.org/licenses/by/3.0/br/ application/pdf Elsevier |
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| language |
English |
| topic |
PbMoO4 Photocatalysis Hydrothermal PVA Rhodamine B Microcrystals |
| spellingShingle |
PbMoO4 Photocatalysis Hydrothermal PVA Rhodamine B 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 |
| description |
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 |
| format |
article |
| author |
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 |
| author_facet |
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 |
| author_sort |
Araújo, Vinícius Dantas |
| title |
Effect of polyvinyl alcohol on the shape, photoluminescence and photocatalytic properties of PbMoO4 microcrystals |
| title_short |
Effect of polyvinyl alcohol on the shape, photoluminescence and photocatalytic properties of PbMoO4 microcrystals |
| title_full |
Effect of polyvinyl alcohol on the shape, photoluminescence and photocatalytic properties of PbMoO4 microcrystals |
| title_fullStr |
Effect of polyvinyl alcohol on the shape, photoluminescence and photocatalytic properties of PbMoO4 microcrystals |
| title_full_unstemmed |
Effect of polyvinyl alcohol on the shape, photoluminescence and photocatalytic properties of PbMoO4 microcrystals |
| title_sort |
effect of polyvinyl alcohol on the shape, photoluminescence and photocatalytic properties of pbmoo4 microcrystals |
| publisher |
Elsevier |
| publishDate |
2021 |
| url |
https://repositorio.ufrn.br/handle/123456789/32082 |
| work_keys_str_mv |
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| _version_ |
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