Monday, 26 June 2006 - 11:20 AM
Tahoe Room (John Ascuaga’s Nugget Casino Resort)
49

EDTA Degradation by Electrochemically Mediated Oxygen Activation

Derek F. Laine, University of Idaho, Moscow, ID and I. Frank Cheng, Universtiy of Idaho, Moscow, ID.

Previously it has been shown that an aqueous mixture of zero valent iron, ethylenediaminetetraacetic acid (EDTA) and air-named ZEA, can be employed for the oxidative destruction of organic pollutants. The formation of FeIIEDTA by ZEA results in the activation of O2 and subsequent formation of reactive oxygen species such as H2O2 and HO•. The hydroxyl radical is thought to be responsible for the non-selective and potent oxidation of organic material, including the EDTA chelate. In this work, an electrochemical analog to the ZEA system has been developed to gain insight into the mechanism of the ZEA system. The degradation of EDTA by the electrochemical system is determined quantitatively and gives evidence for a homogeneous reaction mechanism by the ZEA system. Hydrogen peroxide is a proposed intermediate in both the ZEA and the electrochemical system and is therefore quantified in these experiments. Maximum H2O2 production was found to occur at 3hrs of electrolysis with a concentration of 0.1378 mM.

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