Obtaining silver molybdates using the method analysis for methylene blue catalysis

摘要: The silver-based semiconductors belonging to the group of transition metal oxides have attracted significant attention because of their unique photosensitivity, which provides these materials with excellent photocatalytic activity mainly due to the effects of plasmon resonance. For the applicability of these materials, the stability during reuse is fundamental to avoid the generation of secondary residues. This dissertation proposed to accomplish the study of the structural and morphological properties of silver molybdates obtained by the sonochemical method for the reaction medium between pH 1 and pH 8. Evaluating the application of molybdates through the reuse of the powders obtained in the catalysis of methylene blue dye. The silver molybdate powders were obtained by the sonochemical method and characterized by X-ray diffraction (XRD), field emission electron microscopy (SEM-FEG), and UV-Visible spectroscopy by diffuse reflectance to estimate the value of optical band-gap. The catalytic activity on the methylene blue dye as well as the stability of the evaluated powders were also evaluated. It was observed that the synthesized materials crystallize in the structures Ag2Mo3O10. 2H2O, Ag2Mo2O7 and Ag2MoO4, as a function of the pH of the reaction medium. With the structures of Ag2Mo3O10. 2H2O and Ag2Mo2O7 presenting nanorod morphology, while the structures of Ag2MoO4 present irregular micrometric morphology, with both structures obtained after the sonochemical method presenting a high content of superficial silver precipitates. The complete decolorization of the dye solution was obtained after 5 minutes exposure of the …