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时间:2020-03-23
《凹凸棒石黏土吸附模拟含盐化工废水中Pb(Ⅱ)离子研究.pdf》由会员上传分享,免费在线阅读,更多相关内容在行业资料-天天文库。
1、第35卷第2期非金属矿Vlo1.35No.22012年3月Non.MetallicMinesMarch,2012凹凸棒石黏土吸附模拟含盐化工废水中Pb0I)离子研究谭立强姚超冯良东。钱运华程晓春。(1常州大学石油化工学院,江苏常州213164;2淮阴工学院生命科学与化学工程学院,江苏淮安223001)摘要研究了凹凸棒石黏土吸附模拟含盐化工废水中ab(n)离子的动力学和热力学吸附行为。考察了接触时间、吸附剂浓度、pH值、离子强度、不同电解质离子和温度等条件对吸附率的影响,并提出了相应的吸附机理。结果表明:凹凸棒石黏土是一种较好的重金属吸附剂,凹凸棒石黏土吸附Pb(
2、n)离子较好地符合假二级动力学方程,吸附过程受pH值和离子强度影响较大,在低pH值下表面络合和离子交换是主要的吸附机理。P~II)离子在凹凸棒石黏土上的吸附为Lan~uk型。在298.15~338.15K温度范围内,凹凸棒石黏土对Pb(11)离子是一个自发的吸热过程,吸附过程的△G0分别为.16.96、-20.O0和-22.80kJ/mol,而△和基本不随温度的变化而变化,其值分别为146.00J/(mol·K】和(26.50i-0.05)kJ/mol。关键词凹凸棒石黏土吸附Pb(Ⅱ)离子动力学热力学中图分类号:x703;TD985文献标识码:A文章编号:100
3、0-8098(2012)02-0058-05StudyOiltheSorptionofPb(II)ontoAttapulgitefromSimulatedSaliferousChemicalWastewaterTanLiqiangYaoChaoFengLiangdongQianYunhua2ChengXiaochun2(1SchoolofPetrochemicalEngineering,ChangzhouUniversity,Changzhou,Jiangsu213164;2SchoolofLifeScienceandChemicalEngineer-ing,H
4、uaiyinInstituteofTechnolcIgY,Huaian,Jiangsu223001)AbstractThekineticsandthermod)namicsofPb(II)adsorbedontoattapulgitefromsimulatedsaliferouschemicalwastewaterwerestudied.Theexperimentalfactorssuchascontacttime,solidcontent,pHvalue,ionicstrength,foreignionsandtemperatureontheadsorptio
5、nratioofPb(II)wereinvestigated,andthecorrespondingsorptionmechanismwasproposed.ExperimentalresultsindicatedthattheattapulgitewasasuitablesorbentinthepreconcentrationandsolidificationofPb(II)fromsaliferoussolutions.ThesorptionofPb(II)ontoattapulgitecouldbedescribedwithpseudo—second—or
6、dermodelandwasstronglydependentonpHvalueandionicstrength.ThesorptionofPb(II)wasmainlydominatedbyouter-spheresurfacecomplexationand/orionexchangeatlowpHvalue.TheLangmuirandFreundlichmodelswereusedtosimulatethesorptiondataattemperaturesof298.15,318.15and338.15K,respectivelly,andtheproc
7、essofsorptionofPb(II)ontoattapulgitewasapttoLangmuirmode1.Intheadsorptiontemperaturerangeof298.15~338.15K,thesorptionofPb(II)ontoattapulgitewasspontaneousendothermicprocess,thecalculatedthermodynamicparametersofAGwere·16.96,一20.00and一22.80kJ/mol,respectivelly,buttheAS”and△了werealmost
8、unchangeable
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