In:
ECS Meeting Abstracts, The Electrochemical Society, Vol. MA2020-01, No. 21 ( 2020-05-01), p. 1265-1265
Abstract:
Titanium electrodes coated by transition metal oxides have been used in many applications, thus they remain the subject of constant research and improvement. One of the most important applications for this type of electrode is the electro-generation of hydroxyl radicals ( • OH), via catalytic water oxidation, during the electrochemical degradation of organic compounds. In this sense, the intention of this study was the development of modified surfaces by transition metal oxides (IrO 2 /Ta 2 O 5 ||Ti with Ir:Ta 70:30 and 30:70; and RuO 2 /Ta 2 O 5 ||Ti with Ru:Ta 70:30 and 30:70) for electrochemical advanced oxidation processes (AOP) to degrade organic micropollutants, specifically amoxicillin (AMX). The characterization of the surface morphology and composition of the different anodes used in this study was made by Scanning Electron Microscopy (SEM) – Energy Dispersive X-ray Spectroscopy (EDX), X-Ray Photoelectron Spectroscopy (XPS) and electrochemical characterization; the last one was carried out by cyclic voltammetry (CV) and electrochemical impedance spectroscopy (EIS). Additionally, the indirect detection of • OH generated on the surface of the electrode was done by UV-Vis spectrophotometry using coumarin. The corresponding degradation was carried out by electrolysis of AMX in an aqueous medium applying a current of 15 mA, where the amoxicillin concentration was measured throughout by High Performance Liquid Chromatography (HPLC) - UV-Vis, obtaining efficiencies of more than 90 % AMX degradation in 0.1 M Na 2 SO 4 after 400 min. The Carbon Organic Demand (COD) removal was also measured, obtaining up to 80% removal using the same experimental conditions in presence of IrO 2 /Ta 2 O 5 ||Ti 70:30 by the major generation of • OH than using RuO 2 /Ta 2 O 5 ||Ti 30:70.
Type of Medium:
Online Resource
ISSN:
2151-2043
DOI:
10.1149/MA2020-01211265mtgabs
Language:
Unknown
Publisher:
The Electrochemical Society
Publication Date:
2020
detail.hit.zdb_id:
2438749-6
