纳米零价铁对γ-六六六污染水体及沉积物的修复效果与机理

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1、AbstractAbstractOrganochlorinePesticides(OCPs)areubiquitouspersistentorganiccontaminantsinaqueoussediment，anddirectlyorindirectlythreatenhumanhealthandthesafetyofaqueousecosystem．Theyareenvironmentalcontaminantswhichareofstrongtoxicityanddifficulttobebiodegraded．Traditionaltechnolog

2、iesencountersomeobstaclessuchasnon-completedegradation，lowefficiencyandSOon．Nanometalparticlesrepresentsanewgenerationofenvironmentalremediationtechnologiesthatcouldprovidecost—effectivesolutionstosomeofthemostchallengingenvironmentalcleanupproblems．Researchresultshaveshownthatnanom

3、etals／bimetalsareveryeffectiveforthetransformationanddetoxificationofawidecommonenvkoumentalcontaminants．varietyofInthisstudy,weusedT-HCHasobjectiveOCPstoresearchtheirdegradationinaqueoussedimentbyaseriesofllanometalmaterialssynthesizedusingliquidphasereductionmethod，andhasthemainco

4、nclusionsasthefollowing．‘1．Nanoscalezerovalentironparticles(nZVDweresynthesizedusingliquidphasereductionmethod．TEManalysisindicatedthatthesizeofnZVlwas<100n／n，andclusteredinthemedium．Itdisplayedhi曲reactivitytodecompose丫-hexachlorocyclohexane(丫-HCH)．Morethan90％of7-HCHWasremovedin90mi

5、nwitll0．5g／LofnZVIinthesolution．Thereactionratecoefficientandremovalefficiencywereaffectedbymanyfactors，suchastheamountofnZVI，pH，theinitialconcentrationof7-HCHandcoexistingions．Thereactionratedecreased证thincreasinginitialpH．N03‘greatlyinhibitedthedegradationreaction，butCa2+，M92+and8

6、042‘hadlittleeffectonit．2．Itwasapparentlyirregularlythaty-hexachlorocyclohexaneWasdegradedbynanoscalezerovalentironparticleswhenthesedimentofdifferentgranularsizeWasaddedtoreactionsystem．Smallparticlessize(<63umand63—150um)ofsedimentsamplecouldacceleratedegradationreaction，butlarger

7、size(>150um)ofsedimentsamplesinhibitedthedechlorinationofnanozerovalentiron．DegradationreactionWasrestrictedduetothepresenceofcarbonateandorganicmatter(humus)inIIIAbstractsediment，hydratedmetaloxidesandclaymineralsofsedimentmightbebeneficialtotheremovingofy-hexachlorocyclohexane．The

8、resultsofresearchal