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1、摘要氯代硝基苯是一类含氯含硝基芳香烃化合物，广泛用作医药、染料和农药生产的中间体，该类污染物化学性质稳定、具有三致效应和遗传毒性，是美国EPA,欧共体及我国优先控制的持久性有毒污染物(PTS)，其有效的控制技术受到环境研究者的极大关注。近年来，零价铁(ZVI)作为还原剂，已证实了对氯代芳香烃和硝基芳烃类等污染物具有还原脱氯与转化活性。基于氯代硝基苯污染物特性和已有ZVI研究成果，关键词:零价铁，氯代硝基苯，还原，-IV-AbstractChloronitrobenzenes,asimportantbuildingblocksforsynthesiso
2、findustrialchemicals,arequiterecalcitrantandtoxic.Theyhavebeendeclaredtobetheprioritypersistenttoxicsubstances(PTS)bytheEPAofUSA,EECandChina,andgreatinterestistakenintheremediationtechnique.Overthepastdecade,Zero-valentiron(ZVI)hasattractedconsiderableattentionasaeffectivereduc
3、tant,whichiscapableofreducingavarietyofimportantorganicpollutants,suchaschlorinatedhydrocarbonsandnitroaromaticcompounds(NACs).Basedonitssuccessfulapplicationinthesitureactivebarriersaswellasinabove-groundtreatmentsystems,weinvestigatedthereductivetransformationcharacterization
4、ofchloronitrobenzenesbyZVIinanaerobic,NaHC03-HAcbufferedbatchsystems,to(1)gaininsightintothereductivetransformationmechanism,influencingfactorsandkineticsof4-chloronitrobenzene(4-CNB),(2)furtherourunderstandingofthereductivetransformationactivityofNACs,including2-chloronitroben
5、zene(2-CNB),3,4-dichloronitrobenzene(3,4-DCN),nitrobenzene(NB),4-nitrophenol(4-NP)and4-nitroaniline(4-NA),and(3)setupthecorrelationbetweenreductivetransformingratesofNACsandmolecularconnectivityindexs(MCI).Thefollowingresultswereachieved:1.Inanaerobic,pH5NaHC03-HAcsolution,NACs
6、werereducedbyZVItoaminearomaticcompounds.Reductivereactionswerefollowedbypseudo-first-orderkinetics.4-CNBwasreducedto4-CAbyZVIwithout-IV-dechlorinationproductAN,andthereductivetransformationpathwaywasproposeddependingontheGC/MSanalysis.ComparedtoZVI,Pd/ZVI(Pdloadingof10-sand2X1
7、0-6)showed40%and66%dechlorinationefficiencywiththeproductof4-CAandAN,butPd/ZVImeantnosignificancetoenhancethereductivetransformationrate.2.Thereductivetransformationratewasaffectedbyvariousfactorsincludingacidpretreatment,ZVIdosageandsurfacearea,initialconcentrationof4-CNB,andt
8、hebufferpH.Andinthepresenceofultrasound,theratewasenha
