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ElectrochimicaActa50(2005)3685–3692Degradationof4,6-dinitro-o-cresolfromwaterbyanodicoxidationwithaboron-dopeddiamondelectrodeCristinaFlox,Jose´AntonioGarrido,RosaMar´ıaRodr´ıguez,FrancescCentellas,Pere-Llu´ısCabot,ConchitaArias,EnricBrillas∗LaboratorideCi`enciaiTecnologiaElectroqu´ımicadeMaterials,DepartamentdeQu´ımicaF´ısica,FacultatdeQu´ımica,UniversitatdeBarcelona,Mart´ıiFranqu`es1-11,08028Barcelona,SpainReceived18November2004;receivedinrevisedform11January2005;accepted16January2005Availableonline9February2005AbstractAnodicoxidationof4,6-dinitro-o-cresol(DNOC)hasbeenstudiedinacellof100mlwithaboron-dopeddiamondanodeandagraphitecathode,bothof3-cm2area.Solutionscontaininguptoapproximately240mgl−1ofcompoundinthepHrange2.0–12.0havebeentreatedat100,300and450mAbetween15and50◦C.Totalmineralizationisalwaysachievedduetothegreatamountofhydroxylradical(•OH)producedasoxidantontheanodesurface.Totalorganiccarbonismorerapidlyremovedinacidmedium,beingtheoptimumpH3.0.Thedegradationrateincreaseswhentemperature,currentandDNOCconcentrationincrease.However,at100mAdepollutionbecomesmoreeffectivefrom71mgl−1ofinitialpollutant.Apseudofirst-orderkineticsforDNOCdecayisalwaysfoundbyreversed-phasechromatography,witharateconstantpracticallyindependentofpH,asexpectedifthesameelectroactivespeciesisoxidizedinallmedia.Ion-exclusionchromatography−allowedthedetectionofoxalicacidastheultimatecarboxylicacid.ThemineralizationprocessleadstothecompletereleaseofNO3ionsfromthedestructionofnitroderivativeintermediates.Theseproductsareoxidizedsimultaneouslywithaccumulatedoxalicaciduptotheendofelectrolyses.ComparativetreatmentofthesamesolutionswithaPtanodeyieldsaquitepoordepollutionbecauseofthegenerationofmuchloweramountsofreactive•OHonitssurface.©2005ElsevierLtd.Allrightsreserved.Keywords:4,6-Dinitro-o-cresol;Anodicoxidation;Boron-dopeddiamondelectrode;Watertreatment;Totalorganiccarbonremoval;Mineralizationcurrentefficiency1.Introductionfrom0.214gl−1atpH4.0to33.3gl−1atpH10duet
