Surfactant-Mediated Morphology and Photocatalytic Activity of α‑Ag2WO4 Material
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Altres documents de l'autoria: Guerra Macedo, Nadia; Gouveia, Amanda; Alvarez Roca, Roman; Assis, Marcelo de; Gracia, Lourdes; Andres, Juan; Leite, Edson R.; Longo, Elson
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Mostra el registre complet de l'elementcomunitat-uji-handle:10234/9
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INVESTIGACIONMetadades
Títol
Surfactant-Mediated Morphology and Photocatalytic Activity of α‑Ag2WO4 MaterialAutoria
Data de publicació
2018-03Editor
American Chemical SocietyCita bibliogràfica
MACEDO, Nadia G., et al. Surfactant-Mediated Morphology and Photocatalytic Activity of α-Ag2WO4 Material. The Journal of Physical Chemistry C, 2018, 122.15: 8667-8679.Tipus de document
info:eu-repo/semantics/articleVersió de l'editorial
https://pubs.acs.org/doi/abs/10.1021/acs.jpcc.8b01898Versió
info:eu-repo/semantics/acceptedVersionParaules clau / Matèries
Resum
In the present work, the morphology (hexagonal rod-like vs cuboid-like) of an α-Ag2WO4 solid-state material is manipulated by a simple controlled-precipitation method, with and without the presence of the anionic ... [+]
In the present work, the morphology (hexagonal rod-like vs cuboid-like) of an α-Ag2WO4 solid-state material is manipulated by a simple controlled-precipitation method, with and without the presence of the anionic surfactant sodium dodecyl sulfate (SDS), respectively, over short reaction times. Characterization techniques, such as X-ray diffraction analysis, Rietveld refinement analysis, Fourier-transform (FT) infrared spectroscopy, FT Raman spectroscopy, UV–vis spectroscopy, transmission electron microscopy (TEM), high-resolution TEM, selected area electron diffraction, energy-dispersive X-ray spectroscopy, field emission-scanning electron microscopy (FE-SEM), and photoluminescence emission, are employed to disclose the structural and electronic properties of the α-Ag2WO4 material. First-principles calculations were performed to (i) obtain the relative stability of the six low-index surfaces of α-Ag2WO4; (ii) rationalize the crystal morphologies observed in FE-SEM images (using the Wulff construction); and (iii) determine the energy profiles associated with the transformation process between both morphologies induced by the presence of SDS. Finally, we demonstrate a relationship between morphology and photocatalytic activity, evaluated by photodegradation of Rhodamine B dye under UV light, based on the different numbers of unsaturated superficial Ag and W cations (local coordination, i.e., clusters) of each surface. [-]
Proyecto de investigación
Fundaca̧õ de Amparo à Pesquisa do Estado de Saõ Paulo (FAPESP 2012/ 14004-5, 2013/07296-2, 2017/07240-8, and 2013/26671-9) ; Conselho Nacional de Desenvolvimento Cientifíco e Tecnológico (CNPq 439234/2016-6, 150205/2017-1, and 166281/ 2017-4) ; Generalitat Valenciana (PrometeoII/2014/022, Prom-eteo/2016/079, ACOMP/2014/270, ACOMP/2015/1202) ; Ministerio de Economia y Competitividad (CTQ2015-65207-P) ; Programa de Cooperacioń Cientifica con Iberoamerica (Brasil) of Ministerio de Educación (PHBP14-00020)Drets d'accés
© 2018 American Chemical Society
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