电絮凝-Removal of Heavy Metal Ions by Electrocoagulat

电絮凝-Removal of Heavy Metal Ions by Electrocoagulation for Continuous Useof Fe2+Fe3+-Mediated Electrochemical Oxidation Solutions974Bull.KoreanChem.Soc.2008,Vol.29,No.5YounSuJungandMyounghoPyoRemovalofHeavyMetalIonsbyElectrocoagulationforContinuousUseofFe2+/Fe3+-MediatedElectrochemicalOxidationSolutionsYounSuJungandMyounghoPyo*DepartmentofChemistry,SunchonNationalUniversity,Sunchon,Chonnam540-742,Korea.*E-mail:mho@scnu.ac.krReceivedJanuary15,2008Removalofheavymetalions(Cd2+andZn2+)byelectrocoagulation(ECG)wasinvestigatedinanacidiccondition,whichisnecessaryforre-usingordischargingthemediatedelectrochemicaloxidation(MEO)media.Effectsofvariousparameterssuchaselectrolytes,currentdensities,andelectrodematerialswereexaminedforametal-contaminatedMEOsystemusingFe2+/Fe3+pairsasamediator.ItwasfoundthatECGwithAlelectrodesisgreatlyaffectedbythepresenceofFe2+.[Cd2+]and[Zn2+]remainconstantuntil[Fe2+]reachesacertainconcentrationlevel(ca.10mM).ThispreferentialremovalofFe2+duringECGwithAlelectrodesisnot