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当前位置:首页 > 商业/管理/HR > 企业文化 > 改性玉米秸秆对Cu2废水的吸附刘江国
AdsorptionofCu2+wastewaterwithmodifiedcornstrawLiuJiangguo1,ChenYucheng1,2,LiJiexia1,3,LiuBo1,JiangXiaoli1(1.CollegeofResources&Environment,SouthwestUniversity,Chongqing400716,China;2.KeyLabofChongqingAgriculturalResources&Environment,Chongqing400716,China;3.EnvironmentalProtectionBureauofJiangjinDistrict,Chongqing402260,China)Cu2+1,1,2,1,3,1,1(1.,400716;2.,400716;3.,402260)[]Cu2+。、pH、Cu2+。:≤50mg/LCu2+,0.3g(6g/L)、pH6.5~7.0、298K、35min,Cu2+97.2%,10mg/g。Cu2+Cu2+、;Langmuir、FreundlichTemkin,Langmuir,12.195mg/g。,35min,Elovich。[];Cu2+;[]X703.1[]A[]1005-829X(2010)06-0018-04Abstract:Theinfluenceofsorbentdosage,pH,temperatureandcontacttimeontheadsorptionofCu2+byusingmodifiedcornstrawhavebeenstudied.TheresultsshowthattheadsorptionrateofCu2+inthesimulatedwastewaterisabout97.2%,andadsorptioncapacityisabout10mg/g,whenthedosageofcornstrawisabout0.3g(6g/L),pH6.5-7.0,adsorbingtemperature298Kandabsorbingequilibriumtime35minutestotheCu2+wastewaterwhosemassconcentrationislessthan50mg/L.TheadsorptioncapacityofmodifiedcornstrawtoCu2+increaseswiththeincreaseofCu2+equilibriumconcentrationinthesolution,temperature,andabsorbingtime.TheadsorptionprocesscanbefittedverywellbyLangmuir,FreundlichandTemkinequation.Amongthem,Langmuirequationdescribedbest.Itssaturatedadsorptioncapacityis12.195mg/g.TheadsorptionofCu2+withmodifiedcornstrawisaspontaneouslyen-dothermicreactionthatreachesastablebalancewithin35min.ElovichequationisthebestmodeltodescribedthedynamicscharacteristicofCu2+.Keywords:modifiedcornstraw;copperionswastewater;adsorption[](CSTC2009AB7027)Cu2+,、、、、、〔1〕。,、Cu2+〔2〕,。、、、、、〔3〕,Cu2+。,Cu2+,,“”,Cu2+。11.1,、、841μm,50%ZnCl2,24h,2,(640W)4min,1%30620106IndustrialWaterTreatmentVol.30No.6Jun.,201018——2010-06,30(6)、pH7、,250μm,0.2829g/mL,98mL/g,718.09mg/g。1.2CuSO4·5H2O,,;200mg/L。Cu2+,200mg/L。Cu2+《、、、》(GB/T7475—1987)。1.2.1,Cu2+50mL,1%HCl1%NaOHpH,,200r/min。,,Cu2+,Cu2+。3。1.2.250mLCu2+,288、298、308K200r/min40min,Cu2+,Cu2+(),Frendlich、LangmuirTemkin〔4〕,R2。1.2.350mL9.832、19.653、28.984、39.836、50.023mg/LCu2+,200r/min0、5、10、15、20、25、30、35、40、50、60、70、90min,Cu2+,Cu2+,、、Elovich〔5〕,R2。22.1Cu2+10Cu2+50.023mg/L50mL,pH6,0.1、0.15、0.2、0.25、0.3、0.4、0.5、0.6、0.7、1.0g,298K,200r/min40min,Cu2+,1。1,,Cu2+,0.3g96.6%,8.05mg/g,,。,0.3g。2.2pHCu2+9Cu2+50.023mg/LCu2+50mL,1%HCl,0.1mol/LNaOHpH1.0、2.0、3.0、4.0、5.0、6.0、7.0、8.0、9.0,,298K200r/min30min,Cu2+,2。2,pH1.0~6.0,pH,Cu2+;pH7.0,,97.2%8.10mg/g。pH,,〔6〕。pH7.0,,6.5~7.0pH。2.3Cu2+2.3.1Cu2+Cu2+,:Cu2+19——2010-06,30(6),Cu2+,288、298、308K,3。3,Cu2+Cu2+,。Cu2+0~50.023mg/L,,288、298、308K6.89、7.82、9.47mg/g,50.023~100mg/L,,288、298、308K7.45、8.45、10.25mg/g,。2.3.2Cu2+Freundlich、LangmuirTemkin,Cu2+,1。1,,Cu2+,Langmuir,Cu2+,Cu2+。Langmuir,R2>0.99,Cu2+Langmuir;Xm,;k1,,Xm,〔7〕。2.3.3,〔8〕。△G0、△H0、△S0Kd:lgKd=△S02.303R-△H02.303RT;△G0=△H0-T△S0Kd=C0-CtCt·Vm。Cu2+,Kd,lgKd1/T,,△H0△G0,2。2,Cu2+△G<0,△H>0,△S>0,Cu2+、。,-△G,,△H>0,△S,Cu2+。298K(R2=0.9818),,298K。2.4Cu2+2.4.1Cu2+5,9.832、19.653、28.984、39.836、50.023mg/LCu2+50mL,pH7,0.3g,298K200r/min0、5、10、15、20、25、30、35、40、50、60、70、90min。,,30mL,Cu2+。3,4。4,,。3:1(10min)74%~75%;2(10~35min)22%~23%,〔9〕;3(35min)。,Cu2+T/K△G/(kJ·mol-1)△H/(J·mol-1)△S/(J·mol-1·K-1)R2288-6.990.9131298-7.28133228.900.9818308-7.530.93242Cu2+1Cu2+FreundlichlgX=lgk2+1/nlgcTemkinX=A+BlncXm/(mg·g-1)k1R2nk2R2ABR22889.0990.0540.99632.2341.0970.9499-1.1914.5920.981529810.3950.0530.99642.2361.2490.9456-1.2175.1940.980730812.1950.0580.99462.2571.5390.9473-1.0856.2730.9805Langmuir1/X=1/Xm+1/(Xmk1c)T/K:X,mg/g;Xm,mg/g;cCu2+,mg/L;k1、k2、n、A、B;5。20——2010-06,30(6),35min。2.4.2Cu2+、、ElovichCu2+,R23。3,Elovich,R20.82,Cu2+,Cu2+〔10〕,,,,。2.5180.25、0.3、0.4g,28.984、39.836、50.023mg/L、pH7Cu2+50mL,200r/min298K30min,Cu2+,3。,Cu2+≤50.023mg/L,,,。3,Cu2+50.023mg/L,0.3g(6g/L)、pH6.5~7.0,298K,35min,Cu2+97.2%,8.10mg/g。Cu2+Cu2+,Cu2+。Langmuir、FreundlichTemkin,Langmuir,12.195mg/g。,,Cu2+,、,298K。Cu2+,35min;,,。ElovichCu2+。[][1]WikeA,BunkeG,GatzP.Removaloflead,cadmium,nickelandzincbyadsorptiononmicroalgae[J].ProgressinMiningandOilfieldChemistry,1999(4):337-346.[2]NgahWSW,EndudCS,MayanarR.Removalofcopper()ionsfromaqueoussolutionontochitosanandcross-linkedchitosanbeads[J].ReactiveandFunctionalPolymers,2002,50(2):181-190.[3],,.[J].:,2008,29(2):51-54.[4].[M].:,2006:1-10.[5],,,.Cr[J].,2008,24(6):21-25.[6],,,.Cr3+[J].,2006,7(1):122-125.[7],,.[J].,2007,7(2):64-67.[8]MalkocE,NuhogluY.Potentialofteafactorywasteforchromium()removalfromaqueoussolutions:thermodynamicandkineticstudies[J].Sep.Purif.Technol.,2007,54(3):291-298.[9]MohanaSV,RaoaNC,KarthikeyanJ.Adsorptiveremovalofdirectazodyefromaqueousphaseontocoalbasedsorbents:akineticandmechanisticstudy[J].HazardousMaterials,2002,90(2):189-204.[10],,,.Pb2+[J].:,2005,37(5):62-68.,:Cu2+3Cu2+/(mg·L-1)(lnCt=a-kt)(lnX=a+klnt)Elovich(X=a+klnt)akR2akR2akR29.8320.6100.0350.675-0.1530.1660.7930.7690.2210.82219.6531.3030.0350.6750.5480.1640.8001.5520.4390.82728.9841.8280.0360.7250.7700.1680.8152.2550.6730.84939.8361.9960.0350.6751.2410.1640.8013.1040.8780.82750.0232.2000.0350.6001.4560.1660.7933.8441.1070.822:Ctt,mg/L;X,mg/g;a、k;t;12。[](1984—),2008。E-mail:ljg200401@sina.c
本文标题:改性玉米秸秆对Cu2废水的吸附刘江国
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