Bibliographic citations
Grandez, F., (2017). Modificación de electrodos de fieltro de grafito con nanoaleaciones de Cu y Ag para aplicaciones en procesos electro-fentón [Tesis, Pontificia Universidad Católica del Perú]. http://hdl.handle.net/20.500.12404/9542
Grandez, F., Modificación de electrodos de fieltro de grafito con nanoaleaciones de Cu y Ag para aplicaciones en procesos electro-fentón [Tesis]. PE: Pontificia Universidad Católica del Perú; 2017. http://hdl.handle.net/20.500.12404/9542
@mastersthesis{renati/527568,
title = "Modificación de electrodos de fieltro de grafito con nanoaleaciones de Cu y Ag para aplicaciones en procesos electro-fentón",
author = "Grandez Arias, Fernando",
publisher = "Pontificia Universidad Católica del Perú",
year = "2017"
}
In the present Master Degree thesis it is reported the preparation, characterization and evaluation of graphite felt electrodes modified with Cu-Ag nanoalloys (Cu-Ag NPs), for applications in Fenton processes. The graphite felt was characterized by cyclic voltammetry (CV) in order to study its electrochemical behaviour, and it was found that it yielded better efficiency when activated in a voltage range of -2 to 2 V. The activated electrodes were treated by electro oxidation in presence of HNO3 1 M and thereafter they were characterized by Fourier transform infrared spectroscopy (FT-IR). The treated electrodes were modified by the deposition of Ag, Cu and Cu-Ag NPs in neutral media by means of the differential pulse amperometry method (DPA). The presence of those NPs was confirmed by diffuse reflectance UV-vis spectroscopy. The structural and morphological analysis was carried out by X-ray diffraction (XRD) and scanning electronic microscopy (SEM). As for the production of H2O2 after 1 h of its electro-generation, at pH values of 3, 7 and 10, and using voltages of -1, -2 and 3 V, it was found that at voltages between -1 and -2 V, the efficiency for producing H2O2 was lower for the modified electrodes than for the electrodes treated by electro-oxidizing in HNO3; and that at -3 V, the efficiency of the treated electrodes is multiplied by a factor of 1,4 (40 %), while that of the modified electrodes is multiplied by factors between 3 – 8,7, depending on the Cu: Ag ratio and pH. Finally, it was determined that the pH value at which the maximum amount of H2O2 is produced can vary according to the molar ratio Cu:Ag in these NPs.
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