Event 6th IWA YWP México 2022 starts on May 23, 2022 at 9:00:00 AM CDT
[091] Voltamperometric characterization of the reduction of dissolved oxygen to hydrogen peroxide
Tecnologías de Tratamiento (TECTRA)
Location: Room 2 - 5/25/22, 5:15 PM - 5/25/22, 5:30 PM (UTC) (15 minutes)

[091] Voltamperometric characterization of the reduction of dissolved oxygen to hydrogen peroxide
Danay Alexandra Charles Estudiante de maestría  at UNIVERSIDAD AUTONOMA DE COAHUILA d_charles@uadec.edu.mx 8611028330

Egresada en diciembre de 2020 de la carrera de Ingeniería en Recursos Minerales y Energéticos de la Universidad Autónoma de Coahuila, misma institución donde recibió el reconocimiento de “lobo distinguido” en 2019 y la medalla Juan Antonio de la Fuente en 2021. 

En 2020 la Society for Mining, Metallurgy, and Exploration (SME) le otorgó la Richard Klimpel Memorial Scholarship. En 2021 participó como coautora del articulo “Effect of Magnesium on the Hydrophobicity of Sphalerite” publicado en la revista Minerals. 

Actualmente realiza estudios de posgrado en la Universidad Autónoma de Coahuila en el programa de Maestría en Exploración y Aprovechamiento Sustentable de los Recursos Minerales.

Hydrogen peroxide is used to oxidize the remaining cyanide in the effluents of precious metal leaching plants. This document presents the electrochemical characterization of the reduction of dissolved oxygen to produce hydrogen peroxide. Evaluating this reaction allowed to understand the fundamentals of the process to develop an “in-site” operation to produce the oxidizing agent. This technology consists of using the activated carbon surface to catalyse the reduction of dissolved oxygen. To achieve this, the electroreduction of dissolved oxygen at different conditions was characterized by cyclic voltammetry and factors such as concentration of oxygen and pH were evaluated. According to the results, the reduction of dissolved oxygen is unstable at alkaline conditions (i.e., pH 13) since oxidation and reduction reactions occur simultaneously. Otherwise, reduction is stable at acid conditions (i.e., pH 3), and it is carried out in a potential range between 200 and 400 mV. Dissolved oxygen concentration (i.e., 6.4, 3.6, and 0.5 mg/L) has a significant effect on electric current when the potential is swept in the negative direction at pH 3.