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1、AdvancedMaterialsResearchVols550-553(2012)pp2428-2435Online:2012-07-26©(2012)TransTechPublications,Switzerlanddoi:10.4028/www.scientific.net/AMR.550-553.2428Adsorptionofheavymetalsbysodiumpolyacrylate-humicacid-rectoritecompositeasanoveladsorbent1,a1,b1,cFangyanChen
2、,WeiYeandYubinTang1SchoolofBiotechnologyandchemicalEngineering,JiangsuUniversityofScienceandTechnology,Zhenjiang,jiangsu212018,Chinaabccatchen1029@sohu.com,yewei2005@126.com,ybbill@163.comKeywords:Heavymetalions,Adsorbent,Composite,adsorption,Rectorite,humicacid,kin
3、etic,desorptionAbstract.Anovelorganic-inorganiccompositesodiumpolyacrylate-humicacid-rectoritewaspreparedbypolymerizationreactionofacrylicacid,humicacidandrectoriteinaqueoussolutionandusedasadsorbentforremovalofheavymetalsPb(II),Cd(II),Cu(II)andZn(II)ionsfromaqueous
4、solution.Theeffectsofcontacttime,pH,temperatureandadsorbentdosageonadsorptioncapabilitywereinvestigated.Adsorptionkinetics,adsorptionisothermanddesorptionofadsorbedheavymetalionswerealsoresearched.Theresultsindicatedthattheadsorptionreactionofheavymetalswasrapidandr
5、eachedequilibriumin30min.AdsorptioncapacitiesofheavymetalsincreasedwithincreasinginitialpH,temperatureandadsorbentdosage.Adsorptionreactionisendothermic.TheoptimumpHforallthefourionsadsorptionwasobservedat5.5-6.5.TheremovalrateofPb(II),Cd(II),Cu(II)ionswithinitialco
6、ncentrationof50mg/Laremorethan98%,andZn(II)ionsremovalisabout90%.Thesuitabilityofadsorptionkineticsforheavymetalstoapseudo-second-orderkineticsmodelsuggestedthattheadsorptionratemaybegovernedbychemiadsorptioninvolvingionsexchangeorsharingbetweenadsorbentandmetalions
7、.TheadsorptionequilibriumdatawaswellinterpretedbyLangmuirandFreundlichisothermmodel.Theadsorptionbehavedasmonomolecularlayer.Themaximum-1monolayeradsorptioncapacitywas1666.7,666.7,303.0and454.6mg·gforPb(II),Cd(II),Cu(II)andZn(II)ions,respectively,at25℃.Adsorbedmetal
8、ionsweredesorbedeffectivelyby0.1MHClsolution.Desorptionratewasabout95.2,92.4,98.7and94.3%forPb(II),Cd(II),Cu(II)andZn(II)ions,respectively
