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Mediated Electrochemical Oxidation of High Molecular Weight PEGs by Co(III)/Co(II) and Fe(III)/Fe(II) Redox Systems  

Park, Seung-Cho (Department of Environmental Engineering, Dong-A University)
Kim, Ik-Seong (Hwamyeong Water Purification Office, Water Works HQ Busan Metropolitan City)
Publication Information
Applied Chemistry for Engineering / v.16, no.2, 2005 , pp. 206-211 More about this Journal
Abstract
Mediated electrochemical oxidation (MEO) of polyethylene glycols (PEGs) of molecular weight of 1000, 4000 and 20000, was carried out on both platinum (Pt) and titanium-iridium electrodes in 8.0 M nitric acid solution containing 0.5 M Fe(II) and Co(II) ion. The electrochemical parameters such as current densities, kinds of electrode, electrolyte concentration and removal efficiency were investigated in both Fe(III)/Fe(II) and Co(III)/Co(II) redox systems. The PEGs was decomposed into carbon dioxide by MEO in Fe(III)/Fe(II) and Co(III)/Co(II) redox system during 180 min and 210 min at the current density of $0.67A/cm^2$ on the Pt electrode. Removal efficiency of PEGs by MEO was better in Co(III)/Co(II) redox system than Fe(III)/Fe(II) redox system, indicating mediated electrochemical removal efficiency was 100%.
Keywords
polyethylene glycol; Fe(III)/Fe(II) redox; Co(III)/Co(II) redox; mediated electrochemical oxidation; supporting electrolyte;
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