承德沸石改性处理氨氮废水及其吸附容量的研究李贵贤

　　:1673-5196(2006)05-0075-04承德沸石改性处理氨氮废水及其吸附容量的研究李贵贤1,吴　奇1,赵旭涛2,张　琼1,曹天鹏3(1.,　730050;2.,　730060;3.,　730070):通过盐改性、碱热熔-碱水热改性、加热活化等方法对承德沸石进行改性处理,用模拟氨氮废水进行了吸附实验,并采用XRD和SEM对其改性效果及原因进行了分析.通过对比去除效率发现:采用质量分数为7%的NaCl溶液改性的沸石最适合于处理氨氮废水.同时测量了天然沸石吸附氨氮的饱和吸附容量,并比较等温吸附曲线后认为Freundlich曲线有更好的符合性.:沸石;改性;吸附;氨氮废水;吸附容量:X703.1　　:AInvestigationoftreatmentofammonia-nitrogenwastewaterwithmodifiedChengdezeoliteanditsadsorptioncapacityLIGui-xian1,WUQi1,ZHAOXu-tao2,ZHANGQiong1,CAOTian-peng3(1.CollegeofPetrochemicalTechnology,LanzhouUniv.ofTech.,Lanzhou　730050,China;2.PetrochemicalResearchInstituteofLanzhouPetrochemicalCompany,PetroChina,Lanzhou　730060,China;3.SchoolofEnvironmentalandMunicipalEngineering,LanzhouJiaotongU-niversity,Lanzhou　730070,China)Abstract:ModificationtreatmentofChengdezeolitewasconductedbymeansofadditionofinorganicsaltandfused-aqueousalkaliorbythermalactivation,adsorptiontestwasperformedwithsimulatedammonia-nitrogenwastewater,andthemodificationresultandoriginwasfurtheranalyzedbymeansofXRDandSEM.Itwasfoundbycomparingtheremovalratesthatthezeolitemodifiedbyusingalkalisolutionwithmasspercentageof7%wouldbethebestonetotreatammonia-nitrogenwastewater.Meantime,thesatu-rateadsorptioncapacityofnaturalzeoliteusedforammonia-nitrogenadsorptionwasmeasuredandtheiso-thermaladsorptioncurveswerecompared,sothattheFreundlichcurvewasconsideredtohavebettercon-formitytotheactuality.Keywords:zealite;modification;adsorption;ammonia-nitrogenwastewater;adsorptioncapacity　　,:M2/nOAl2O3xSiO2yH2O,,x≥2,Mn.、、、[1].,.、、,.C/N,.,　　:2005-10-17　　:(1966-),,,.[2～4].、,.,NH+4[2～6].、,NH+4、.1　吸附实验1.1　,XRD,,、、325200610　　　　　　　JournalofLanzhouUniversityofTechnologyVol.32No.5Oct.2006.,105℃2h130,.1.2　:、、、、、、、.:[7]..:721、THZ-82A.1.3　----105℃---.1.4　.100mL1g,.0.45μm.:η=(ρ0-ρ)/ρ0×100%:ρ0,ρ.50mg/L,1h1mg/L.2　结果与讨论2.1　,1.15min,,[3,4],,6h,68.76%.6h.1　Fig.1　Influenceofalkalithermaltreatmentonadsorptionefficiencyofammonia-nitrogenadsorptionwithze-olite2.2　-[8],75℃,.1.31.4,1.,[8].XRDSEM(23),,,,.Si,,.2　XRDFig.2　XRDpatternofChengdezeolitemodifiedbyfused-aqueousalkali(a)(b)3　SEMFig.3　SEMmicrographsofzeolitepowdermodifiedwithfused-aqueousalkali2.3　,2h,,,,4,105℃,.[9],(1).2.4　,NaCl,70～75℃3h,76　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　324　Fig.4　Effectofheattreatmentonefficiencyofammonia-nitrogenadsorptionwithzeolite1　Tab.1　ChemicalcompositioncomparisonofChengdezeoliteandJinyunzeolitew/%w/%SiO262.2168.60Al2O313.2310.91Na2O2.883.75K2O1.381.48Fe2O33.331.08CaO3.592.13MgO4.06—9.3011.91150r/min1h,,1.31.4,5,,,NaCl7%90%,20%.SEM(6),、.XRD(7),..5　Fig.5　Effectofinorganicsaltmodifiedzeoliteonammo-nia-nitrogenadsorptionefficiency2.5　,Q=V(ρ0-ρ)/W.V,W.2.1)Langmuir2Langmuir,8.A1/ρ,B1/Q.8:(a)(b)6　SEMFig.6　SEMmicrographsofzeolitepowderbeforeandaf-termodifieation7　XRDFig.7　XRDpatternofChengdezeolitebeforeandaftermodificationwithinorganicsalt1/Q=3.6268/ρ+64.240Langmuir:Qm=15.56mg/g,K=0.0177,R2=0.9825.2　Tab.2　Staticexperimentaldataofammonia-nitrogenadsorp-tionwithzeolite123456ρ0/(mgL-1)50.0070.00100.00150.00300.00500.00ρ/(gL-1)15.6224.0038.3074.00179.50329.75Q/(gmg-1)3.444.606.177.6012.0517.03　　2)Freundlich2Freundlich,9.9Freundlich:lgQ=0.5082lgρ-0.0529　　Q=0.8853ρ0.5082,　Kf=0.88531/n=0.5082,　R2=0.9914775　　　　　　　　　　　:　　　　　　　　　　　　　8　LangmuirFig.8　Langmuirisothermaladsorptioncurve9　FreundlichFig.9　Freundlichisothermaladsorptioncurve　　LangmuirFreundlich,Freundlich,NH+4,[3,10].3　结论1)7%NaCl,20%.2)-,,,.3),150℃.　　4)15.56mg/g,LangmuirFreundlich,Freundlich0～500mg/L.:[1]　.[J].,1998,19(1):23-27.[2]　WEATHERLEYLR,MILADINOVICND.ComparisonoftheionexchangeuptakeofammoniumionontoNewZealandclinoptiloliteandmordenite[J].WaterResearch,2004,38:4305-4312.[3]　SARIOGLUM.RemovalofammoniumfrommunicipalwasterusingnaturalTurkish(Dogantepe)zeolite[J].SeparationandPurificationTechnology,2005,41:1-11.[4]　DUQi,LIUShijun,CAOZhonghong,etal.Ammoniumremov-alfromaqueoussolutionusingnaturalChineseclinoptilolite[J].SeparationandPurificationTechnology,2005,44:229-234.[5]　LANGELLAA,PANSINIM,CAPPELLETTIP.NH+4,Cu2+,Zn2+,Cd2+andPb2+exchangeforNa+inasedimenta-ryclinoptilolite[J].MicroporousandMesoporousMaterials,2000,37:337-343.[6]　,,.[J].,1995,14(1):79-82.[7]　.[M].4.:,2002.[8]　SHIN-JYUNGKANG,KAZUHIKOEGASHIRA,AKIRAYOSHIDA.Transformationofalow-gradeKoreannaturalzeo-litetohighcationexchangerbyhydrothermalreactionwithorwithoutfusionwithsodiumhydroxide[J].AppliedClaySci-ence,1998,13:117-135.[9]　　,,.[J].2003,26(2):53-55.[10]　,,.[J].,2003,16(2):31-34.78　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　32