电沉积法处理电解锌漂洗废水的动力学研究苏赛赛

　　　201129电沉积法处理电解锌漂洗废水的动力学研究＊苏赛赛1,2　李艳静1,2　岳秀萍1　张林楠2　李振山2(1.,　030024;2.,　100871)　:采用电沉积法处理电解锌漂洗工艺废水,以回收废水中的重金属资源。在不同实验条件下对电沉积反应过程中电沉积反应速率及其影响因素进行了研究,结果表明,电沉积回收重金属锌符合准一级动力学规律,当V=6V时,速率常数k=0.0214。最佳实验条件为:槽电压V=6V、电解时间为45～60min、pH为2.5～3.5,反应过程中应充分搅拌。利用电沉积法处理电解锌漂洗废水,将重金属Zn2+还原为单质锌,处理废水的同时实现重金属资源的回收,在工业中有较好的应用前景。:电沉积法;动力学;含锌废水;反应速率RESEARCHONKINETICSOFTREATMENTOFELECTROLYTICZINCWASTEWATERBYELECTRODEPOSITIONSuSaisai1,2　LiYanjing1,2　YueXiuping1　ZhangLinnan2　LiZhenshan2(1.CollegeofEnvironmentalScienceandEngineering,TaiyuanUniversityofTechnology,Taiyuan030024,China;2.CollegeofEnvironmentalScienceandEngineering,PekingUniversity,Beijing100871,China)Abstract:Electrodepositionisusedtotreattherinsingwastewaterforrecoveringzincmetal.Ondifferentex-perimentalconditions,thereactionrateanditsinfluencingfactorsofelectrodepositionarestudied,Theresultsshowthattheprocessofrecoveringzincfollowstheone-stepreactiondynamicsatV=6Vandthereactionrateconstantk=0.0214.Throughtheexperiments,weidentifythebestconditionsforrecoveringofZincare:cellvoltageV=6V,electrolysistimesT=45～60min,pH=2.5～3.5.Thereactionprocessshouldbefullymixed.Byelectrodeposition,HeavymetalsZn2+canbereducedtozinctoachievingtherecoveryofheavymet-als,whichhasagoodprospectintheindustry.Keywords:electrodeposition;kinetics;wastewatercontainingzinc;reactionrate＊(2008ZX07212-01)。　　,。、,、,[1-4]。:、、、[5-8]。,,,,,。,,、、,“”[9-11]。,,,,。,Zn2+,,,,,,,。,,29DOI:10.13205/j.hjgc.2011.s1.049　　　201129、、pH。1　1.1　试验装置:、、3。。,4mm,4mm[12],552mm×360mm。1。1　1.2　试验方法,,。,1。1　g/Lρ(Zn)ρ(Cd)ρ(Cu)ρ(Pb)ρ(Fe)ρ(Mn)ρ(H2SO4)ρ(COD)13.90.0020.20.0120.23301023.80.0050.20.0120.23301533.10.00060.0550.00390.1181.314.918　　4000mg/LZnSO4,、、pH,,[13]。2　2.1　电沉积锌的反应速率:Zn2++2e-※Zn。,(2H++2e-※H2←),,,:-dCAdt=k[CA]:k,1/min;CA,mg/L。lnCZn2+—t,2。mk,k=-m[14]。2　lnCZn2+-t2,R20.95,,。2k。V=4V,k=0.0035;V=6V,k=0.0214;V=8V,k=0.0362。2.2　电沉积反应速率的影响因素2.2.1　4,6,8V,15min,Zn2+,3,t。3　3,,、。,,,;,,,,,;,,H+,Zn2+,Zn2+H+30　　　201129,(2H++2e-※H2←),,。3,,,Zn2+。,,,6V。,,Card[15]。2.2.2　6V,15min,Zn2+,4。,,60min,,。,,Zn2+,,;,H+,,Zn2+,,。,45～60min。4　2.2.3　pHpH1.5、2.5、3.5、4.5,,5。5　pH5,,Zn2+pH。60min,pH1.5,Zn2+97%,pH4.5,Zn2+64%。,,H+,,H+,,,,,,。,H+,,,,,pH。pH2.5～3.5。2.2.4　6V,,15min,6。6　,Zn2+,,,,,,。,6,,,60min,530mg/L,15%。,。3　1),Zn2+,V=6V,k=0.0214。2)Zn2+、、(62)31　　　201129、,、、,,,。[1].[M].:,2001.[2]GeSun,StevenG.Mcnulty,etal.PotentialimpactsofclimatechangeonrainfallerosivityandwateravailabilityinChinainthenext100years[J].12thIscoConference,2002:244.[3]BanisterJ.Population,publichealthandtheenvironmentinChina[J].TheChinaQuartity,1998,156:986-1015.[4]ShenJ.Chian'sfuturepopulationanddevelopmentchallenges[J].TheGeographicalJournal,1998,164(1):33-40.[5].[M].:,2003.[6].1996[R].[7].1999[J].,2000,7:3-9.[8]、,,.[J].(),2003,32(2):144-146.[9],,.[J].,2009,28(4):171-174.[10],,.[J].,2009,28(2):52-56.[11],.[J].,2002,21(1):58-61.[12],,,.[J].,2006,17(2):288-294.[13],,.[J].,2005,14(2):133-138.[14]VasiliosASakkas,DimitraALambropoulou,TriantafyllosA.Al-banisstudyofchlorothalonilphotodegradationinnaturalwatersandinthepresenceofhumicsubstances[J].Chemosphere,2002,48(9):939-945.[15],,,.[J].,2007,1(5):114-117.[16]LiJia,LiRan,LiKefeng,etal.Experimentalstudyoftturbu-lenceeffectonreaeration[J].ProgressinNaturalScience,2000,10(9):693-697.　　201204　34714101E-mail　@126.com2010-12-13(31)pH、,V=6V、60min、pH=2.5～3.5、,Zn2+,。3),Zn2+,,。[1]HutchinsonTC,MeemaKM(Eds.).LeadMercury,CadmiumandArsenicintheEnvironment[M].Oxford:PergamonPress,1987.[2]FergusonJE.TheHeavyElements:EnvironmentImpactandHealthEffects[M].Oxford:PergamonPress,1990.[3].[J].,2004,21(4):54-55.[4],,,.[J].,2006,32(7):5-6.[5].21[J].,2000,22(3):1-2.[6]SapariN.IdrisA.HamidNHA.Totalremovalofheavymetalfrommixedplatingrinsewastewater[J].Desalination,1996,106(1):419-422.[7],,,.[J].,2004,22(1):11-14.[8]Guohuachen.Electrochemicaltechnologiesinwastewatertreatment[J].SeparationandPurificationTechnology,2004,11-41.[9],,.[J].,2001,21(1):11-15.[10],,,.[J].,2008,25(8):61-63.[11]RajeshwarK.Electrochemistryandtheenvironment[J].journalofapplitedelectrochemistry,1994(24):1077-1091.[12],,,.[J].,2003,20(1):7-10.[13],《》.[M]..:.[14].[M]..:,1999.[15]CardJC,ValentinG,StorckA.Theactivedcarbonelectrode-anewexperimentallyverifiedmathematicalmodelforthepotentialdistribution[J].Journaloftheelectrochemicalsociety,1990,137(9):2736-2745.　　030024　7912247E-mail　[e-mail]2010-10-2762