Morphological control of silver chromate by complexation with ammonia
Priscila Fernanda Caperucci1, Marcelo Assis2, Camila Cristina de Foggi3, Elson Longo1
1Universidade Federal de São Carlos - Campus: São Carlos (CDMF) , 2Universidade Federal de São Carlos (CDMF) , 3Universidade Federal de São Carlos (LIEC)
e-mail: [email protected]
In search of a better quality of life of modern man, several researches in the field of materials chemistry have been developed in the last decades [1].The synthesis of inorganic compounds with specific morphology has been of great importance and interest in the field of materials science and nanotechnology [2]. Thus, the search for several synthesis methods has been researched to control the morphology and particle size of these materials for the purpose of improving their photooxidative, photoluminescent and bactericidal properties. Silver Chromate
(Ag2CrO4), belongs to the family of chromates compounds containing Ag with the formula Ag2MO4 (M = Cr, Mo, W). These materials have been studied extensively for applications in different areas, such as working on cathodes for lithium cells or also as catalysts. In addition it presents an unusual reddish coloration, which makes it a very important compound for the pigment and coloring area. Several studies have been done on this particular staining and some authors have concluded that the intense absorption of the compound at 450 nm could be - explained by an A1 transition of the [CrO4] [3]. Therefore, the objective of this study was to evaluate the complexation of Ag + with NH4OH in the synthesis of
Ag2CrO4, evaluating its structural, morphological, optical and photocatalytic properties. The characterization of the samples was made by X-ray diffraction (XRD), ultraviolet-visible (UV-Vis) absorption spectroscopy, Raman spectroscopy, scanning electron microscopy (SEM) and photoluminescence. The activities and modifications of the materials were evaluated at different temperatures.
Acknowledgments
CAPES, FAPESP, CNPq, UFSCar, UJI.
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