ELECTROCHEMICAL MEDIATORS FOR TOTAL OXIDATION OF CHLORINATED HYDROCARBONS - FORMATION KINETICS OF AG(II), CO(III), AND CE(IV)

Mediated electrochemical oxidation (MEO) with Ag(II) and Co(III) in 7 M HNO3 and 3.5 M H2SO4 has been studied. High degradation rates were f ound for superchlorinated organic substances such as pentachlorophenol (PCP), Lindane and polychlorinated biphenyls (PCBs) using Ag(II) in H NO3 as mediator. An investigation on the formation kinetics of Ag(II), Co(III), and Ce(IV) by means of a rotating disc electrode (RDE) led t o a quantitative determination of limiting currents at various mediato r concentrations. Reaction rate constants of water oxidation by Ag(II) were determined at various temperatures and compared to reaction rate s of Co(III).