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膨胀珍珠岩的改性制备及其降解有机污染物的研究.docx

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膨胀珍珠岩的改性制备及其降解有机污染物的研究 Abstract Expandedperlite(EP)hasbeenmodifiedbyimpregnatingwithhydrogenperoxide(H2O2)andiron-chelatingreagenttoenhanceitscatalyticpropertiesforthedegradationoforganicpollutants.ThemodifiedEPwascharacterizedbyFourier-transforminfraredspectroscopy(FTIR),X-raydiffraction(XRD),scanningelectronmicroscopy(SEM),andBrunauer-Emmett-Teller(BET)analysis.TheresultsshowedthatthemodifiedEPhadahighersurfacearea,largerporevolume,andbetterstabilitythantheunmodifiedEP.ThecatalyticactivityofthemodifiedEPwasevaluatedbythedegradationofmethylorangeunderdifferentreactionconditions,includingpH,H2O2concentration,catalystdosage,andtemperature.TheresultsshowedthatthemodifiedEPexhibitedsuperiorcatalyticperformancetotheunmodifiedEPandthatthereactionconditionshadasignificantimpactonthedegradationefficiency.Thedegradationmechanismwasinvestigatedbyanalyzingtheintermediatesandthedegradationproductsusinghigh-performanceliquidchromatography(HPLC)andgaschromatograph-massspectrometry(GC-MS). Introduction Organicpollutantsarewidelypresentinindustrialwastewaterandhavebecomeasignificantthreattotheenvironmentandhumanhealth.Theconventionalmethodsfortheremovaloforganicpollutants,suchasadsorption,coagulation,andbiologicaltreatment,havesomelimitationsandcannotachievesatisfactoryremovalefficiency.Toaddressthisissue,variousadvancedoxidationprocesses(AOPs)havebeendeveloped,whichcaneffectivelydecomposeorganicpollutantsintoharmlessproducts(Yuetal.,2021).AmongtheAOPs,heterogeneouscatalysishasbeenwidelystudiedduetoitshighefficiency,lowcost,andenvironmentalfriendliness. Perliteisanaturalvolcanicglassthatcanbeexpandedbyheating.Expandedperlite(EP)hasaporousstructureandahighsurfacearea,whichmakeitagoodcandidateforheterogeneouscatalysis.However,thecatalyticactivityofEPislimitedduetoitsinertnessandhydrophobicity.ToenhancethecatalyticpropertiesofEP,variousmodificationmethodshavebeenproposed,suchasdopingwithmetalions,impregnatingwithtransitionmetaloxides,andfunctionalizingwithorganiccompounds(Luetal.,201