Publicação: Growth mechanism and photocatalytic properties of SrWO4 microcrystals synthesized by injection of ions into a hot aqueous solution
Nenhuma Miniatura disponível
Data
2013-01-01
Orientador
Coorientador
Pós-graduação
Curso de graduação
Título da Revista
ISSN da Revista
Título de Volume
Editor
Tipo
Artigo
Direito de acesso
Acesso restrito
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.
Descrição
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
Idioma
Inglês
Como citar
Advanced Powder Technology, v. 24, n. 1, p. 344-353, 2013.
