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


Autoria(s): Cavalcante, L. S.; Sczancoski, J. C.; Batista, N. C.; Longo, Elson; Varela, José Arana; Orlandi, Marcelo Ornaghi
Contribuinte(s)

Universidade Estadual Paulista (UNESP)

Data(s)

27/05/2014

27/05/2014

01/01/2013

Resumo

This 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.

Formato

344-353

Identificador

http://dx.doi.org/10.1016/j.apt.2012.08.007

Advanced Powder Technology, v. 24, n. 1, p. 344-353, 2013.

0921-8831

1568-5527

http://hdl.handle.net/11449/74158

10.1016/j.apt.2012.08.007

WOS:000312472200049

2-s2.0-84870526938

Idioma(s)

eng

Relação

Advanced Powder Technology

Direitos

closedAccess

Palavras-Chave #Hot-injection #Photocatalysis #Rhodamine #Rietveld refinement #SrWO4 #Average size #Crystal growth mechanism #Field emission scanning electron microscopy #FT- Raman spectroscopy #FT-Raman spectrum #Growth mechanisms #Photo-catalytic #Photocatalytic property #Raman active modes #Rhodamine 6G #Rhodamine B #Self assembly process #TEM images #Tetragonal structure #Transmission electron microscopy tem #Urchin-like #XRD patterns #Crystal growth #Field emission microscopes #Raman spectroscopy #Solutions #Transmission electron microscopy #Tungstate minerals #X ray diffraction #Microcrystals
Tipo

info:eu-repo/semantics/article