风化煤对水中重金属离子的吸附郝艳玲

《》2008145郝艳玲,范福海(兰州交通大学化学与生物工程学院,甘肃兰州730070):以甘肃景泰风化煤作吸附剂,常温下对水溶液Pb2+、Cu2+、Zn2+进行了吸附实验研究,探讨了吸附动力学、吸附平衡、介质酸度的影响及吸附机理。结果表明,风化煤对几种重金属离子的吸附具有pseudo-second-orderLagergren模型的特征,吸附平衡基本符合Langmuir模型,介质酸度对吸附效果有显著的影响,pH大于5时吸附率均可接近90%。:风化煤;腐植酸;吸附;重金属离子:X781.1　　　:A　　　:1006-6772(2008)05-00104-03　　:2008-05-16　　:(1968-),,,,。　　,,,[1,2]。,,、、、、、、,、[3～6]。,,、、,。1　1.1　原料及主要仪器,,0.2464mm,1。(AR)。BRAICWFX-120()、DELTA320PH(METTLERTOLEDO)、、。1.2　试验方法250mL,100mL,,,pH,,。(%)=　　(mg/L)-(mg/L)(mg/L)×100%(mg/g)=　　(mg/L)-(mg/L)(g)×(L)1.3　分析方法GB/T7475-1987“”[7],pHHNO3NaOH。2　2.1　吸附动力学1.0gpH5.0、100mg/L,,1,30min,Pb2+Cu2+Zn2+,60min,90min104DOI:10.13226/j.issn.1006-6772.2008.05.026　　　　《CAJ-CD》。Lagergren,tpseudo-first-orderpseudo-second-order[8],2,Pb2+、Cu2+、Zn2+pseudo-second-order。Pb2+、Cu2+、Zn2+pseudo-second-order7.125×10-3、5.965×10-3、4.791×10-3(mg/g)-1·min-1。2.2　吸附等温线1.0gpH5.0Pb2+、Cu2+、Zn2+90min,Qce,2,Lang-muir,LangmuirceQ=ceQm+1bQm[9],Qm,b,3,Pb2+Cu2+Zn2+,ΔG=-RTlnbΔG-20～-30kJ/mol,[10]。2.3　pH值的影响pH,4,pH4.0,;pH,,pH5,90%。2.4　饱和吸附和解吸100mLCu2+、Zn2+、Pb2+1000mg/L,pH5250mL,1.0g,2h,2d,,。250mL,100mL1mol/LH2SO42h,24h,。5,Cu2+、Zn2+、Pb2+,Pb2+Cu2+Zn2+。Pb2+、Cu2+、Zn2+,,。2.5　吸附机理探讨,、,,,。、105《》2008145。,RCOOH※RCOO-+H+,。pH,,,,pH,,,H+,,[11];pH,,:nRCOO-+mM2+※Mm(RCOO)n,,,H+,pH[11],。Pb2+,,,,Pb2+[12],Zn2+Cu2+,Cu2+Zn2+,Pb2+Cu2+Zn2+。2.6　对实际废水的吸附,pH5.41,Pb2+、Zn2+、Cu2+41.7mg/L、44.1mg/L37.8mg/L,1.0g100mL,6,,GB8979-1996。3　　Pb2+、Cu2+、Zn2+,90min,Lagergrenpseudo-second-order,Langmuir,Pb2+Cu2+Zn2+,ΔG-20～-30kJ/mol,,pH5.0,90%,。。:[1]　ViraraghavanT.UseofPeatinPollution[J].Environ-mentalStudies,1991,37:163～169.[2]　,.、[J].,2004,30(9):47～49.[3]　StephenJ.Allen,PaulineA,Brown.Isothermanalysesforsinglecomponentandmulti-componentmetalsorptionontolignite[J].JournalofChemicalTechnologyBio-technology,1995,62(1):17～24.[4]　HalinaMartyniuk,JadwigaWieckowska.Adsorptionofmetalionsonhumicacidsextractedfrombrowncoals[J].FuelProcessingTechnology,2003,84(1～3):23～26.[5]　,.[J].,1998,18(1):52～56.[6]　LubalP,SirokyD,FetschD,etal.Theacidobasicandcomplexationpropertiesofhumicacids:Studyofcomplex-ationofCzechhumicacidswithmetalions[J].Talanta,1998,47(2):401～412.[7]　.()[M].:,2002:324～326.[8]　ChristianA,Eligwe,NereusB,etal.AdsorptionThermo-dynamicsandKineticsofMercury(Ⅱ),Cadmium(Ⅱ)andLead(Ⅱ)onLignite[J].ChemicalEngineeringTechnology,1999,22(3):45～49.[9]　GordonMcKay,JohnF.Porter.EquilibriumParametersfortheSorptionofCopper,CadmiumandZincIonsontoPeat[J].JournalofChemicalTechnologyBiotechnolo-gy,1997,69(3):309～320.[10]　YUYing,ZHUANGYuanyi,WANGZhonghua,etal.Adsorptionofwater-solubledyesontomodifiedresin[J].Chemosphere,2004,54(2):425～430.[11]　MarijanaErk,LjerkaMusani,BiserkaRaspor.Thein-teractionsof54Mnwithhumicsubstancesoffreshwatersedimentorigin[J].JournalofEnvironmentalRadioactiv-ity,1997,35(2):203～219.[12]　CordonMcKay,JhonFPorter.EquilibriumparametersforthesorptionofCopper,CadmiumandZincionsontopeat[J].ChemTechBiotechnol,1997,69(3):309～320.(111)《》106　　　　《CAJ-CD》46.32%48.83%,。4　　,。。,,。TheevenhillockcoalwashingplantreducesthewaywhichliesbetweenconsumesHUOYan-xin(JixiMiningindustryGroupEvenHillockCoalmineCoalwashingplant,Jixi158165,China)Abstract:Throughthedetailedmediumflowinspection,thedataanalysis,determinedliesbetweenprimaryfactorwhichconsumes;Takesaseriesoftechnologicaltransformationsmeasure,reducesliesbetweenconsumes,simulta-neouslythroughreducesescapestheputtytoboultmeansandsoonseam,causesthethickcoalsludgeparticipationseparation,therealizationrefinedcoalreturns-ratiomaximization.Keywords:inspection;analysis;transformation;reducesliesbetweenconsumes(92)ExploitationandapplicationofMufflefurnacetemperatureautonomoussystemZHANGJian-min(OilproductsinstituteinthedetectingbranchofChinacoalresearchinstitute,Beijing100013,China)Abstract:ControlsthewarmmetersaccelerationleadcontrolprocedureusingtheATCtemperature,extremelygoodhassuppressedtowerelectricmufflefurnacesthermallag,enhancedhascontrolledthewarmprecision.Keywords:Mufflefurnace;principle;control(106)StudyontheadsorptioncharacteristicsofweatheredcoalforheavymetalionsHAOYan-ling,FANFu-hai(SchoolofChemicalandBiologicalEngineering,LanzhouCommunicationUniversity,Lanzhou730070,China)Abstract:AtestfortheadsorptionofPb2+,Cu2+andZn2+ionswithJingtaiweatheredcoalatnormaltemperaturewascarriedout.Theadsorptionkinetics,theadsorptionequilibrium,theeffectelementsandthemechanismofad-sorptionwerestudied.Theresultsindicatethattheadsorptionprocesswasidenticalrelativelypseudo-second-orderwithLagergrenmodel,theadsorptionisothemswereconsistentwithLangmuirequation,pHvaluewasanimportantfactorinadsorptionprocessandthedisposalratesallcouldreach90%whenpH5.0.Keywords:weatheredcoal;humidacid;adsorption;heavymetalions111