Browsing by Author "Carrasco, Claudia"

Now showing 1 - 3 of 3
  • No Thumbnail Available
    Item
    Effect of Mg and Ca precipitates in the stability of Fe-Mn-Ni anodes used in alkaline seawater electrolysis
    (2024) Maril, Marisol; Delplancke, Jean-Luc; Salvo, Christopher; Hevia, Samuel; Alvear, Tomas; Carrasco, Claudia
    This work investigates the effect of Mg and Ca precipitates on the electrochemical performance of Fe-Mn-Nibased anodes produced through powder metallurgy in simulated and real alkaline seawater. The electrodes that exhibited the best performance in simulated seawater were those containing 60 %Fe-40 %Ni and 15 %Fe-15 %Mn-70 %Fe, both with an overpotential for the oxygen evolution reaction of 370 mV at 10 mA/cm2 and Tafel slopes of 45 and 53 mV/dec, respectively. However, when real alkaline seawater was used as electrolyte, the electrocatalytic ability of these electrodes decreased; the presence of Ca2+ was identified as a significant factor promoting pitting corrosion. The study concludes that a comprehensive investigation into the individual effect of seawater ions on electrode performance is necessary.
  • Thumbnail Image
    Item
    Synthesis of indazol-4,7-dione derivatives as potential trypanocidal agents
    (2002) Tapia Apati, Ricardo; Carrasco, Claudia; Ojeda, Scarlet; Salas Sánchez, Cristián Osvaldo; Valderrama Guerrero, Jaime Adolfo; Morello, Antonio; Repetto, Yolanda
  • No Thumbnail Available
    Item
    Use of copper sheet in a solar photo-Fenton-like process applied in the treatment of landfill leachate
    (2023) Poblete, Rodrigo; Rodriguez, Carlos Anibal; Carrasco, Claudia; Herrera, Jose; Salazar-Gonzalez, Ricardo
    It is known that copper can be used as catalyst in photo-Fenton-like process; however, there is a lack of information related with its use in the treatment of landfill leachate (LL) in solar photo-Fenton-like processes. Here, we studied the effect of the mass of a copper sheet, the pH of the solution, and the concentration of LL in the removal of the organic matter present in this water. Before the reaction with landfill leachate, the copper sheet used in the reaction was constituted by Cu+ and Cu2O, respectively. The results showed that in a volume of 0.5 L of a pretreated LL, the higher removal of organic matter resulted using a mass of 2.7 g of the copper sheet, a pH of solution of 5, and a concentration of LL of a 10%, obtaining a final value of C/C-0 of chemical oxygen demand (COD) of 0.34, 0.54, 0.66, and 0.84 for concentrations of 25%, 50%, 75%, and 100%, respectively, and 0.0041, 0.0042, 0.0043, and 0.016 for concentration of 25%, 50%, 75%, and 100%, respectively, of C/C-0 of humic acids. The photolysis on LL at its natural pH using solar UV removes very little humic acid and COD, going from 9.4 to 8.5 and 7.7 Abs(254) for photolysis and UV + H2O2, obtaining 8.6 and 17.6% of removal, respectively, and 2.01 and 13.04% removal of COD, respectively. Copper sheet applied under Fenton-like conditions results in 65.9% removal and an increase of 0.2% for humic acid and COD, respectively. Removal using only H2O2 for Abs(254) and COD was 11.95 and 4.3%, respectively. Raw LL produced a 29.1% inhibition of the biological activated sludge rate after the adjustment to pH 7 and the final process of inhibition was 0.23%.