Resumo:
In the present work were produced hybrid matrices of polymethylmethacrylate or polycaprolactone incorporated with phosphomolybdic acid in different concentrations by electrospun technique with the objective to verify the ability of the matrices to recover Ag+ ions in aqueous solutions by means of oxirreduction processes. Infrared spectroscopy was used to identify the interaction between the organic and inorganic parts of the matrices. This interaction was confirmed by the chemical shifting of the C=O bands of PMMA, C-O of PCL and Mo-Ob-Mo of phosphomolybdic acid. The morphological and surface aspects of the matrices were studied by scanning electron microscopy and contact angle measurements. From the microscopy results, it was observed that the fibers containing phosphomolybdic acid has smaller diameters compared to the pure polymeric fibers.The results of the contact angle demonstrated the influence of phosphomolybdic acid on the interaction of the surface of the PMMA matrices with water, showing that the presence of the
inorganic compound provides less hydrophobic character to the matrices. To confirm the ability of the matrices to reduce Ag+ ions, the fibers were irradiated with ultraviolet light and subsequently immersed in a solution containing 0,1 mol/L AgNO3. UV-Vis absorption electron spectroscopy used to quantify the concentration of Ag+ remaining in aqueous solution after the oxirreduction process, from efficiency of the matrices in reducing/recovering Ag+ ions was proven. The presence of silver on the surface of the matrices was verified by scanning electron microscopy images. With the results obtained it was verified the presence of aggregates on the surface of the matrices that
indicates the presence of metallic Ag.
