Facile-Fabrication-of-Magnetic

FacileFabricationofMagneticCarbonCompositesfromHydrocharviaSimultaneousActivationandMagnetizationforTriclosanAdsorptionXiangdongZhu,YuchenLiu,GangLuo,FengQian,ShichengZhang,*andJianminChenShanghaiKeyLaboratoryofAtmosphericParticlePollutionandPrevention(LAP3),DepartmentofEnvironmentalScienceandEngineering,FudanUniversity,Shanghai200433,China*SSupportingInformationABSTRACT:Advancedmagneticcarboncompositeswithhighspecificsurfaceareaandhighmicroporosityarerequiredforbothenvironmentallyandagriculturallyrelatedapplica-tions.However,moreresearchisneededforthedevelopmentofafacileandhighlyefficientsynthesisprocess.Inthepresentwork,anovelapproachofsimultaneousactivationandmagnetizationisproposedforthefabricationofmagneticcarboncompositesviathethermalpyrolysisofhydrochar(i.e.,asolidresiduefromahydrothermalcarbonizationprocess)thathasbeenpretreatedwithmixturesofferricchloride(FeCl3)andzincchloride(ZnCl2).Themainobjectiveofthisstudyistheinvestigationofthevariationofcharacteristicsofmagneticcarboncompositesproducedatvariousconditions,aswellastriclosan(TCS)adsorptionbehavioronsuchcomposites.Thispresentedsimpleone-stepsynthesismethodhasthefollowingadvantages:(a)thehydrocharisactivatedwithhighsurfaceareaandporevolume(upto1351m2/gand0.549cm3/g,respectively),(b)activationandmagnetizationaresimultaneouslyachievedwithoutfurthermodification,(c)themagneticparticles(γ-Fe2O3)arestableunderanacidicmedium(pHof3.0and4.0),and(d)theproductshavethepotentialtoremoveTCSfromaqueoussolutionswithamaximumadsorptioncapacityof892.9mg/g.Theresultsindicatetheeffectivenessofthisfacilesynthesisstrategyinconvertinglow-valuebiowasteintoafunctionalmaterialwithhighperformanceforpollutantremovalfromaqueoussolutions.■INTRODUCTIONInrecentdecades,magneticcarboncompositesderivedfromcarbonaceousmaterials(mainlyincludingwastebiomass,porouscarbonandgraphene)havebeenwidelyinvestigatedinenvironmentalapplications,duetotheircapacityforseparationfromaqueoussolutions,andhaveshownpromisingperformanceinpollutantremoval.1−5Sever