Publication

Electrochemical oxidation of ethylenediaminetetraacetic acid (EDTA) on BDD electrodes: Application to wastewater treatment

Christos Comninellis, Lassine Ouattara, Ilaria Duo
2003
Journal paper

Abstract

The electrochem. oxidn. of EDTA was studied at boron-doped diamond (BDD) electrodes. Cyclic voltammetry in the potential region of water stability showed that EDTA is oxidized in an irreversible 2-electron-transfer mechanism. No fouling phenomena were noticed on the electrode surface. At high anode potential, an oxidn. mechanism of EDTA involving hydroxyl radicals, formed during water discharge, was proposed. The model previously developed for org. oxidn. at nonactive anodes was successfully used in order to predict the trends of COD and instantaneous current efficiency (ICE) during EDTA oxidn. on BDD electrodes. Bulk electrolyzes were performed under different regimes. The very good fit between the exptl. results and theor. values confirmed that EDTA oxidn. at the BDD electrode in the potential region of electrolyte decompn. was a fast reaction. [on SciFinder (R)]

Official source

https://infoscience.epfl.ch/record/79887?ln=en

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Ontological neighbourhood

Chemistry

Physical chemistry: Electrochemistry

Environmental science

Pollution: Water pollution

Related concepts (33)

An electrode is an electrical conductor used to make contact with a nonmetallic part of a circuit (e.g. a semiconductor, an electrolyte, a vacuum or air). Electrodes are essential parts of batteries that can consist of a variety of materials depending on the type of battery. The electrophore, invented by Johan Wilcke, was an early version of an electrode used to study static electricity. Electrodes are an essential part of any battery. The first electrochemical battery made was devised by Alessandro Volta and was aptly named the Voltaic cell.

A reference electrode is an electrode that has a stable and well-known electrode potential. The overall chemical reaction taking place in a cell is made up of two independent half-reactions, which describe chemical changes at the two electrodes. To focus on the reaction at the working electrode, the reference electrode is standardized with constant (buffered or saturated) concentrations of each participant of the redox reaction. There are many ways reference electrodes are used.

A liquid metal electrode is an electrode that uses a liquid metal, such as mercury, Galinstan, and NaK. They can be used in electrocapillarity, voltammetry, and impedance measurements. The dropping mercury electrode (DME) is a working electrode made of mercury and used in polarography. Experiments run with mercury electrodes are referred to as forms of polarography even if the experiments are identical or very similar to a corresponding voltammetry experiment which uses solid working electrodes.

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Electrochemical oxidation of ethylenediaminetetraacetic acid (EDTA) on BDD electrodes: Application to wastewater treatment

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