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外文资料--Biosorption characteristics of extracellular polymeric.PDF

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外文资料--Biosorption characteristics of extracellular polymeric.PDF

BIOSORPTIONCHARACTERISTICSOFEXTRACELLULARPOLYMERICSUBSTANCEEPSPRODUCEDBYRHIZOBIUMRADIOBACTERFORREMOVALOFCUIIANDMNIIIONSFORMAQUEOUSSOLUTIONSLILIWANGA,B,FANGMAA,B,SHANSHANFENGA,B,DEZHISUNB,C,BINGYUA,B,JIEXINGA,BASTATEKEYLABORATORYOFURBANWATERRESOURCEANDENVIRONMENT,HARBIN,150090,CHINABDEPARTMENTOFMUNICIPALANDENVIRONMENTALENGINEERING,HARBININSTITUTEOFTECHNOLOGYCCOLLEGEOFENVIRONMENTALSCIENCEANDENGINEERING,BEIJINGFORESTRYUNIVERSITY,BEIJING100083,CHINAEMAILLIILIVE163COMABSTRACTTHISPAPERDEALSWITHTHEEXTRACELLULARPOLYMERICSUBSTANCEEPSOFRHIZOBIUMRADIOBACTERF2USEDASANOVELBIOSORBENTTOREMOVECUIIANDMNIIIONSFROMAQUEOUSSOLUTIONSTHECUIIANDMNIIIONSBIOSORPTIONCHARACTERISTICSOFTHEEPSWEREEXAMINEDASAFUNCTIONOFINITIALPH,CONTACTTIMEANDEPSCONCENTRATIONTHEPROPERPHOFTHEAQUEOUSSOLUTIONWASFOUNDTOBE60FORBOTHTHEBIOSORPTIONOFCUIIANDMNIIBIOSORPTIONEQUILIBRIUMTIMESOFCUIIANDMNIIWEREACHIEVEDIN10HTHEMAXIMUMBIOSORPTIONCAPACITIESUNDEROPTIMUMCONDITIONSOFCUIIANDMNIIONTHEEPSWEREDETERMINEDTOBE4530162MG/GAND2886128MG/G,RESPECTIVELYTHEFITNESSOFTHEBIOSORPTIONDATAFORLANGMUIRANDFREUNDLICHISOTHERMMODELSWASINVESTIGATEDITWASFOUNDTHATBIOSORPTIONOFCUIIANDMNIIIONSONTOTHEEPSWEREBETTERSUITABLETOLANGMUIRTHANFREUNDLICHISOTHERMMODELCOMPETITIVEBIOSORPTIONOFMNIIANDCUIIIONSWASALSOINVESTIGATEDTODETERMINETHESELECTIVITYOFTHEBIOFLOCCULANTKEYWORDSBIOSORPTION;EXTRACELLULARPOLYMERICSUBSTANCEEPS;CUII;MNII;COMPETITIVEBIOSORPTIONIINTRODUCTIONHEADING1WATERANDWASTEWATERSCONTAMINATEDBYHEAVYMETALSHAVERESULTEDINADVERSEIMPACTONPUBLICHEALTHANDECONOMY1,ANDEXPOSURETOHEAVYMETALSEVENATTRACELEVELSISBELIEVEDTOBEARISKFORHUMANBEINGS2INTHEPASTDECADESVARIOUSPROCESSESHAVEBEENDEVELOPEDTOTREATSUCHWATERSINCLUDINGCHEMICALPRECIPITATION,IONEXCHANGE,ADSORPTIONANDREVERSEOSMOSIS3HOWEVER,THESEMETHODSARESOMETIMESRESTRICTEDBECAUSEOFTECHNICALAND/ORECONOMICALCONSTRAINTS4BIOSORPTIONISCONSIDEREDASANALTERNATIVEPROCESSFORTHEREMOVALOFHEAVYMETALS,METALLOIDSPECIES,COMPOUNDSANDPARTICLESFROMAQUEOUSSOLUTIONBYBIOLOGICALMATERIALS5COMPAREDWITHCONVENTIONALMETHODSFORTHEREMOVALOFTOXICMETALSFROMWASTEWATER,THEBIOSORPTIONPROCESSOFFERSPOTENTIALADVANTAGESSUCHASLOWOPERATINGCOST,MINIMIZATIONOFTHEVOLUMEOFCHEMICALAND/ORBIOLOGICALSLUDGETOBEDISPOSEDOF,ANDHIGHEFFICIENCYINDETOXIFYINGVERYDILUTEEFFLUENTS6THISPAPERWASCARRIEDOUTTOINVESTIGATETHEEPSPRODUCEDBYCULTUREOFRHIZOBIUMRADIOBACTERF2ASABIOSORBENTFORTHEREMOVALOFMNIIANDCUIIFROMAQUEOUSSOLUTIONSTHEOPTIMUMBIOSORPTIONCONDITIONSWEREDETERMINEDSUCHASINITIALPH,CONTACTTIMEANDDOSAGEOFTHEEPSTHESUITABLEBIOSORPTIONISOTHERMWASPUTFORWARDBASEDONTHEBIOSORPTIONDATAINADDITION,THEBIOSORPTIONPERFORMANCEOFTHEEPSINBINARYMETALSOLUTIONSYSTEMSWASALSOEXAMINEDTHECHOICEOFMETALSWASMADEREGARDINGTHEIRINDUSTRIALUSEANDPOTENTIALPOLLUTIONIMPACTCUISNOTACUTELYTOXICTOHUMANSBUTITSEXTENSIVEUSEANDINCREASINGLEVELSINTHEENVIRONMENTMAYCAUSESERIOUSHEALTHPROBLEMS7MNREMOVALISONEOFTHEPROBLEMSINUSINGGROUNDWATERSINCEMNISACOMMONELEMENTINGROUNDWATERELEVATEDLEVELSOFMNINDRINKINGWATERARECONSIDEREDUNDESIRABLEWHENWATERISEXPOSEDTOAIR,MNIIISOXIDIZEDTOMNIVTHEMNIVPRECIPITATECANSTAINHOUSEHOLDUTENSILSANDCLOTHESANDMAYIMPARTAMETALLIC,BITTER,ASTRINGENTORMEDICINALTASTETOTHEWATER8IIMETHODSAMICROORGANISMSSTRAINF2WASORIGINALLYSCREENEDFROMSOILBYSTATEKEYLABORATORYOFURBANWATERRESOURCEANDENVIRONMENTSKLUWREANDIDENTIFIEDASRHIZOBIUMRADIOBACTERBPREPARATIONOFTHEEPSOFF2THECOMPOSITIONOFPRODUCTIONMEDIUMWASASFOLLOWSPERLITER10GGLUCOSE,5GK2HPO4,2GKH2PO4,05GPEPTONE,05GUREA,02GMGSO47H2O,AND02GNACLCORRELATIVEDETAILSWEREDESCRIBEDINAPREVIOUSPAPERBYZHUETAL9NATIONAL863PROGRAMSQ2009AA06XK14824129781424447138/10/25002010IEEETHEFERMENTATIONBROTHWASCENTRIFUGEDAT16,000GFOR20MINTOREMOVECELLSTWOVOLUMESOF4℃COLDETHANOLWEREADDEDTOTHESUPERNATANTANDSTOREDAT4℃FOR24HTHEPRECIPITATEWASOBTAINEDBYCENTRIFUGATIONAT10,000GFOR5MINANDWASHEDSEVERALTIMESWITHETHANOLTHENTHEPRECIPITATEWASLYOPHILIZEDANDTHECRUDECOMPOUNDBIOFLOCCULANTWASOBTAINEDCBIOSORPTIONEXPERIMENTSMNIIANDCUIISOLUTIONSWEREPREPAREDFROM1000MG/LSTOCKSOLUTIONSOFCUIIANDMNIIOBTAINEDBYDISSOLVINGCUSO45H2OANDMNSO4H2OINDOUBLEDISTILLEDWATER,RESPECTIVELYTHELYOPHILIZEDEPSWASDISSOLVEDINDOUBLEDISTILLEDWASTOGIVEA2G/LSOLUTIONTHEADSORPTIONSTUDIESWERECARRIEDOUTIN250MLERLENMEYERFLASKSINTHEFIRSTGROUPOFEXPERIMENTS,BIOSORPTIONOFMANGANESEIIANDCOPPERIIFROMAQUEOUSSOLUTIONSCONTAININGASINGLEMETALIONWASINVESTIGATEDTHEEFFECTOFPHONTHEBIOSORPTIONOFCOPPERIIANDMANGANESEIIONTHEEPSWASINVESTIGATEDINTHEPHRANGEOF2070100MLOFSOLUTIONSCONTAINING100MG/LMANGANESEIIAND100MG/LCOPPERIIIONSWEREPREPAREDUSINGTHESTOCKSOLUTIONS,RESPECTIVELYTHEINITIALPHOFEACHMETALSOLUTIONWASADJUSTEDTOTHEREQUIREDPHVALUETHEN3MLOFTHEEPSSOLUTIONWASADDEDTOTHEEACHMETALSOLUTIONANDTHEMIXTUREWASSHAKENONANORBITALSHAKERAT125R/MINAND25℃01FOR2HSIMILARLY,METALSOLUTIONSWITH100MG/LMETALIONSWEREUSEDTOINVESTIGATETHEPROPERCONTACTTIMERANGINGFROM05TO3HWITHATIMEINTERVALOF05HINTHELATTEREXPERIMENTS,THEDOSAGEOFTHEEPSVARIEDFROM1TO5MLUSINGSOLUTIONSCONTAINING100MG/LMETALIONSTHEIRCONTENTSWERECENTRIFUGEDAT3600GFOR5MINANDTHESUPERNATANTWASANALYZEDFORRESIDUALMETALIONCONCENTRATIONINTHESECONDGROUPOFEXPERIMENTS,COMPETITIVEBIOSORPTIONOFMNIIANDCUIIIONSFROMSOLUTIONSCONTAININGTHESETWOMETALSWASINVESTIGATEDTHEMEDIUM100MLCONTAINING100MG/LOFEACHMETALIONWASINCUBATEDWITH3MLOFTHEEPSSOLUTIONAT25℃01AFTERBIOSORPTION,SUPERNATANTWASSEPARATEDFROMTHEEPSBYCENTRIFUGATIONASDESCRIBEDABOVEDANALYTICALPROCEDURESTHECONCENTRATIONSOFREMAINEDMNIIANDCUIIIONSINTHESUPERNATANTWEREDETERMINEDBYICPAESOPTIMA5300DV,PE,USAWITHWORKINGWAVELENGTHSFORCUIIANDMNIIAT3273933NMAND257610NM,RESPECTIVELYTHEAMOUNTOFADSORBEDMETALIONSONPERGRAMOFTHEEPSWASOBTAINEDBYUSINGTHEGENERALEQUATIONMVECICEQ/⋅−1WHEREQEISTHEAMOUNTOFMETALIONSADSORBEDONTHEEPSMG/G;CIISTHEINITIALMETALIONCONCENTRATIONINSOLUTIONMG/L;CEISTHEEQUILIBRIUMMETALIONCONCENTRATIONINSOLUTIONMG/L;VISTHEVOLUMEOFTHESOLUTIONL;MISTHEAMOUNTOFTHEEPSUSEDINTHEREACTIONMIXTUREGALLTHEEXPERIMENTSWERECARRIEDOUTINTRIPLICATEANDTHEARITHMETICALMEANVALUESWEREUSEDINCALCULATIONSALLTHECHEMICALSUSEDINTHISSTUDYWEREOFANALYTICALGRADEIIIRESULTSANDDISCUSSIONAEFFECTOFPHONBIOSORPTIONCAPACITYHYDROGENIONCONCENTRATIONISCONSIDEREDASONEOFTHEMOSTIMPORTANTPARAMETERSTHATINFLUENCETHEADSORPTIONBEHAVIOUROFMETALIONSINAQUEOUSSOLUTIONS10THEEFFECTOFINITIALPHONTHEBIOSORPTIONOFCUIIANDMNIIIONSONTOTHEEPSWEREEVALUATEDWITHINTHEPHRANGEOF2070AT100MG/LINITIALMETALIONCONCENTRATIONS,RESPECTIVELYFIG1STUDIESBEYONDPH7WERENOTATTEMPTEDBECAUSEPRECIPITATIONWOULDBELIKELYINTHEPRESENCEOFHIGHERCONCENTRATIONOFHYDROXYLIONSINTHEBIOSORPTIONMEDIUMFROMFIG1,ITWASOBSERVEDTHATBOTHTHEADSORPTIONOFCUIIANDMNIIWEREHIGHLYPHDEPENDENTANDINCREASEDWITHTHEINCREASEOFPHOFTHEAQUEOUSSOLUTIONUPTOPH6THEBIOSORPTIONOFMETALIONSREACHEDTHEMAXIMUMATPH6ANDDECREASEDTHEREAFTERTHISPHDEPENDENCYOFBIOSORPTIONCAPACITYCOULDBEEXPLAINEDBYTHEFUNCTIONALGROUPSINVOLVEDINMETALUPTAKEANDMETALCHEMISTRYBECAUSEOFTHECOMPETITIONOFHIGHPROTONCONCENTRATIONATLOWPHCONDITIONS,HEAVYMETALSWEREPARTIALLYRELEASEDTOAQUEOUSPHASE11WHENTHEPHINCREASES,THEMETALIONSTHENCOMPETEMOREEFFECTIVELYFORAVAILABLEBINDINGSITES,WHICHINCREASESBIOSORPTION12BEFFECTOFCONTACTTIMEONBIOSORPTIONCAPACITYTHEEFFECTOFTHECONTACTTIMEONTHEBIOSORPTIONOFCUIIANDMNIIONTHEEPSWASDEPICTEDINFIG2INTHECASEOFCUIIBIOSORPTIONONTOTHEEPS,THEBIOSORPTIONPROCESSREACHEDEQUILIBRIUMAT10HANDABIOSORPTIONCAPACITYOF4207122MG/GWASACHIEVEDTHEMAXIMUMBIOSORPTIONOFMNOCCURREDAT10HAFTERTHISEQUILIBRIUMPERIODTHEAMOUNTOFADSORBEDMETALIONSDIDNOTCHANGESIGNIFICANTLYWITHANINCREASEINCONTACTTIMEFORBOTHCUIIANDMNIITHUSSUBSEQUENTBIOSORPTIONEXPERIMENTSWEREPERFORMEDUSINGTHEOPTIMUMPHANDCONTACTTIMEREQUIREDTOREACHEQUILIBRIUMOFEACHMETALIONTHISRAPIDUPTAKEOFMEALSMAYBEANIMPORTANTPARAMETERFORAPRACTICALAPPLICATIONOFBIOSORPTIONININDUSTRIALWASTEWATERTREATMENT23456701020304050COPPERIIMANGANSESEIIQEMG/GPHFIG1EFFECTOFPHONTHECUIIANDMNIIBIOSORPTIONONTHEEPS05101520253001020304050COPPERIIMANGANESEIIQEMG/GTIMEHFIG2EFFECTOFCONTACTTIMEONTHECUIIANDMNIIBIOSORPTIONONTHEEPSCEFFECTOFTHEEPSDOSAGEONBIOSORPTIONCAPACITYTHENUMBEROFAVAILABLESITESANDEXCHANGINGIONSFORADSORPTIONDEPENDSUPONTHEAMOUNTOFADSORBENTINTHEBIOSORPTIONPROCESSTHEEFFECTOFADSORBENTCONCENTRATIONONTHEMETALREMOVALEFFICIENCYWASPRESENTEDINFIG3ITWASFOUNDTHATTHECUUPTAKEOFPERGRAMEPSREACHEDITSMAXIMUMATTHEEPSDOSEOF10MGINTO100MLSOLUTIONOFMETALSSIMILARLYINTHECASEOFLEAD,THEBIOSORPTIONCAPACITYWASFOUNDTOINCREASEWITHINCREASEINEPSDOSAGEUPTO30MGHOWEVER,THEBIOSORPTIONCAPACITYDECREASEWITHINCREASINGDOSAGEATHIGHEPSCONCENTRATIONANDTHISMAYBEBECAUSETHATANINCREASEINPOLYSACCHARIDECONCENTRATIONLEADSTOINTERFERENCEBETWEENBINDINGSITESTHEDECREASEOFSPECIFICUPTAKEMIGHTBEATTRIBUTEDTOMETALCONCENTRATIONSHORTAGEINSOLUTION13THEBIOSORPTIONCAPACITIESOFTHEEPSREACHED4530162MG/GFORCUIIIONSAND2886128MG/GFORMNIIIONS;THESEARECOMPARABLEWITHTHEVALUESREPORTEDINPREVIOUSSTUDIESTHEBIOSORPTIONCAPACITIESOFGEOBACILLUSTOEBIISUBSPDECANICUSWEREDETERMINEDAS415AND232MG/GBIOSORBENTFORCUIIANDMNII14THEMAXIMUMBIOSORPTIONVALUESOFCUIIONTHEASPERGILLUSFLAVUSFUNGALBIOMASSWASFOUNDTOBE1346099MG/G3102030405001020304050COPPERIIMANGANNESEIIQEMG/GDOSAGEOFTHEEPSMGFIG3EFFECTOFEPSDOSAGEONTHECUIIANDMNIIBIOSORPTIONONTHEEPSTABLEIISOTHERMPARAMETERSFORCUIIANDMNIIBIOSORPTIONMETALSLANGMUIRPARAMETERSFREUNDLICHPARAMETERSQ0MG/GB1/MGR2NKFR2CUII51230015609894839204170882MNII28169130809908133180480513DBIOSORPTIONISOTHERMSLANGMUIRANDFREUNDLICHMODELSARETHEMOSTWIDELYUSEDMODELSINTHECASEOFTHEADSORPTIONOFMETALIONSTHESEISOTHERMEQUATIONSAREASFOLLOWSFREUNDLICHNECFKEQ/12ECNFKEQLOG/1LOGLOG3LANGMUIR1/0EBCEBCQEQ401011QEBCQEQ510203040500005101520COPPERIIMANGANESEIICE/QEG/LCEMG/LFIG4LANGMUIRISOTHERMSFORBIOSORPTIONOFCUIIANDMNII15202530354045303234363840COPPERIIMANGANESEIILNQELNCEFIG5FREUNDLICHISOTHERMSFORBIOSORPTIONOFCUIIANDMNII01020304050BINARYMETALMIXTURESINGLEMETALIONQEMG/GCOPPERIIMANGANESEIIFIG6BIOSORPTIONOFCUIIANDMNIIONTHEEPSINBINARYMETALIONMIXTUREINTHEABOVEEQUATIONS,KFANDNAREFREUNDLICHCONSTANTS,WHICHAFFECTTHEADSORPTIONPROCESS,SUCHASADSORPTIONCAPACITYANDINTENSITYOFADSORPTION,RESPECTIVELYQ0MG/GANDBARELANGMUIRCONSTANTSRELATEDTOMONOLAYERADSORPTIONCAPACITYANDENERGYOFADSORPTIONRESPECTIVELYTHEVALUESOFTHECONSTANTSASWELLASTHECORRESPONDINGREGRESSIONCOEFFICIENTS,WHICHWEREOBTAINEDBYFITTINGTHEEXPERIMENTALDATAATPH6ANDACONTACTTIMEOF10H,WEREL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