硅烷化改性沸石对重金属离子的吸附性能-石太宏

73Vol．7No．320133ChineseJournalofEnvironmentalEngineeringMar．201312111.5102752.510275、。。。Ni2+、Cu2+、Zn2+Pb2+1、1、1.60.6g/L4411.23、17.41、15.4559.42mg/gLangmuirpH=2～6。X703A1673-9108201303-1045-08AdsorptionofheavymetalionsbysilylationmodifiedzeoliteShiTaihong12LüCan1ZuoLina11.SchoolofEnvironmentalScienceandEngineeringSunYet-SenUniversityGuangzhou510275China2.GuangdongProvincialKeyLaboratoryofEnvironmentalPolutionandRemediationTechnologyGuangzhou510275ChinaAbstractAnewkindofzeolitemodifiedbysilylationusedforheavymetalionadsorptionwasdevelopedinthisstudy．ThemodificationandadsorptioncharacterofsilylanizedzeolitewasinvestigatedviaSEMFTIRspec-trumXRDandadsorptionexperiments．ItwasrevealedthatNH2wasgraftedonsurfaceofzeoliteandtheopti-mumdosagesoftheadsorbentsforNi2+Cu2+Zn2+andPb2+were1g/L1g/L1.6g/Land0.6g/L．Theresultsofsorptionkineticstudyshowthattheadsorptionfitspseudo-second-ordermodelbetter．Andtheadsorp-tionwasinferredtobechemisorptionwithgoodfitofLangmuiradsorptionisotherm．ThesilylationzeoliteremovedheavymetaleffectivelyoverthepHrange2～6thereforetheadsorbentcouldbeappliedinacidheavymetalwastewatertreatment．Keywordsnaturezeoliteorganicmodificationheavymetalionadsorptioncharacter2011－11－242012－01－111963～。[e-mail]1-5。、6-8。、、9。、。、。。、、pH。11.11003-APESARAldrich。7RJX-4-13SHA-CDZF-6020Quanta400FEQUINOX55BrukerD/MAX-ⅢXVarioELEl-ementarZ-5000。1.26g700℃3h90℃4h10%120℃150mL4mol/LNaOH15min15min800mL120℃24h250mL100mL2mLAPES80℃24h24h。SEM、BET、FIRT、XRD。1.3120～120mg/L50mL150mL0.03～0.5g298、308318K0～48hAAS。1Table1Conditioncontroloftheexperiment123456r/min150150150150150150mg/L10020～120100100100100g/L1.21.20.6～1.21.21.21.2K298298298298～318298298h242424240～4824pH4.5±0.24.5±0.24.5±0.24.5±0.24.5±0.22～822.12.1.1SEM1SEMFig.1SEMpatternofrawzeolitematerial2SEMFig.2SEMpatternofsilylationmodificationzeolite。2.1.2BETBET10.3m2/g36.6m2/g64013Fe3+。。2.1.3FTIR3FTIRNH27951088cm－12932cm－1Si—O—Si694795cm－1。3FTIRFig.3FTIRofrawmaterialandmodifiedzeolite2.1.4XRD4XRD。FTIR、SEM。4XRDFig.4XRDofsilylationmodifiedzeolite2.1.5C、NHN、CH。2、Table2Elementalanalysisofrawmaterialactivatedandsilylationzeolite%N0.0230.0290.0421.961C0.0500.3860.2695.631H0.6880.5130.5771.4602.22.2.11Ni2+、Cu2+、Zn2+Pb2+。5aNi2+11.4g/L1。5b1g/L1g/LCu2+2g/L。5cZn2+1.6g/L。5dPb2+0.6g/LPb2+140mg/g。2Ni2+、Cu2+、Zn2+Pb2+。6Ni2+、Cu2+、Zn2+Pb2+1、1、1.60.6g/L。3。Ni2+、Cu2+、Zn2+Pb2+1、1、1.60.6g/L。Ni、CuZn74017。。2.2.21Ni2+、Cu2+、Zn2+Pb2+。744mg/gPb2+＞Zn2+＞Cu2+＞Ni2+Cu2+＞Pb2+＞Zn2+＞Ni2+。74origin8.0qty=A2+A1－A2/1+x/x0p1A1t=0minq0mg/gA2qemg/gx0tminpp=3xytq。840133Table3Balanceadsorptiontimeandcapacityminqemg/gR2Ni2+2507.220.5464Cu2+6016.060.8160Zn2+24018.290.5282Pb2+18060.660.9613Ni2+、Cu2+、Zn2+Pb2+7.22、16.06、18.2960.66mg/g250、60、240180min7Ni2+、Cu2+、Zn2+Pb2+4Cu2+＞Pb2+＞Zn2+＞Ni2+。2。Origin8.0。Lagergren6-810-12。894。4Table4Parametersofpseudo-first-orderandpseudo-second-ordermodelfittingqemg/gk1min－1R2qemg/gk2g/mg·minR2Cu2+5.320.00460.307517.410.00460.9919Ni2+2.220.00060.772011.230.00140.9943Zn2+5.860.00840.127915.450.02060.9652Pb2+7.340.00330.041059.420.00210.99914Cu2+、Ni2+、Zn2+Pb2+17.41、11.23、15.4559.42mg/gOrigin。2.2.3105Ni2+、Cu2+、Zn2+Pb2+LangmuirFreundlichLangmuir。2.2.4pH11pHNi、CuZnPbpH=4COH－pH＜6420mg/g。2.2.56pH=4～6。、。、Lewis。9401710Ni2+、Cu2+、Zn2+Pb2+Fig.10AdsroptionisothermofNi2+Cu2+Zn2+andPb2+5LangmuirFreundlichTable5ParametersofLangmuirandFreundlichisothermKLangmuirFreundlichq0bR2KFnR2Ni2+298308318－169.49－204.0890.91－0.015－0.0170.0900.95880.91610.99902.8994.9488.0570.9921.1571.3500.85160.85880.9958Cu2+29830831821.8019.690.310.1120.0810.0080.58010.68230.697915.7561.06729.43610.442－269.542－23.4470.68240.6656－0.1890Zn2+29830831821.7018.3225.469.4751.35612.0960.91200.87200.92496.1031.0875.6503.678－146.4133.1240.64960.51460.7543Pb2+298308318－7279.82125.9484.60－0.0030.1710.2910.97250.91710.953922.15524.04722.0350.9812.5802.6470.91560.64710.817011pHFig.11EffectofpHonadsorptioncapacityNH2Mn+LewisLewisNH2。12。31—NH2。2Ni2+、Cu2+、Zn2+、Pb2+。a050136Table6Comparisonofadsorbentsmg/gPb2+9.7313Pb2+19.8814Ni2+13.0015Cu2+Zn2+Pb2+20.2616.9720.01XiangDongLiu16Ni2+Cu2+Zn2+Pb2+17.4111.2315.4559.4212Cu2+Fig.12ComplexadsorptionprocessbysilylationmodifiedzeoliteforCu2+Ni2+、Cu2+、Zn2+Pb2+1、1、1.60.6g/L4＞90%、20.25%、34.64%＞90%。b、Ni2+、Cu2+、Zn2+Pb2+417.41、11.23、15.4559.42mg/gOrigin44220、368、250180min4Pb2+＞Cu2+＞Zn2+＞Ni2+。c4Langmuir。dpHpHpH=2～6pH=4Ni2+、Cu2+、Zn2+Pb2+36、18、1570mg/gpH=216、0.4、627mg/g。、、。1MotsiT．RowsonN．SimmonsM．Adsorptionofheavymetalsfromacidminedrainagebynaturalzeolite．Int．J．Miner．Process．200992742-482KarnitzO．GurgelL．DeMeloJ．etal．Adsorptionofheavymetalionfromaqueoussinglemetalsolution．Biore-sourceTechnology200798131291-12973MorenoN．QuerolX．AyoraC．etal．Utilizationofze-olitessynthesisedfromcoalflyashforthepurificationofacidminewaters．Environ．Sci．Technol．20013563526-35344MyroslavS．BuszewskiB．TerzykA．Studyoftheselec-tionmechanismofheavymetaladsorptiononclinoptilolite．ColloidInterface20063041121-285BaileyS．OlinT．BrickaR．etal．Areviewofpoten-tiallylow-costsorbentsforheavymetals．WaterRes．199933112469-24796PandayK．PrasadG．SinghV．CopperⅡ