可循环磁性天然沸石的制备及其吸附性能研究

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1、中南大学硕士学位论文可循环磁性天然沸石的制备及其吸附性能研究姓名：闫冠杰申请学位级别：硕士专业：矿物材料学指导教师：袁明亮20090501硕士学位论文摘要吸附量也不断增大，其最大吸附量分别为54．53mg／g、84．00mg／g和66．99mg／g。在分离科学与技术领域，本文制备磁性天然沸石的方法具有独特的优势。从复杂多相体系中将重金属离子分离和再生不需要对废水进行预处理，随后通过外加磁场使饱和磁性沸石与作用体系分离。关键词：磁性天然沸石，改性，吸附性能，重金属离子，磁性分离ll硕士学位论文ABSTRACTABSTRACTInrecentyears，withtherapiddev

2、elopmentofsocialeconomy,plentyofindustrialwastesandsanitarysewageswerepouredintonaturalwater,ofwhichsubsistentheavymetalionscanaffecthumanhealthseriously．Giventhisproblem，researchersresolvetheworseningpollutioncausedbytheheavymetalionsusingdifferentadsorbentsandprocessingmethods．Inthispaper,t

3、heclinoptiloliteproducedinJinyuncountyofZhejiangprovinceasanobject，whichWasmodifiedbytraditionalmethodsinordertoobtainthemodifiednaturalzeolitewithhighadsorptioncapacity．Then，onthebasisofmagneticcarriertechnology,differentmagneticallymodifiedzeolites(MMZ)werepreparedbycombiningthemodifiedzeol

4、itewithFe304viachemicalco-precipitationmethodandphysicaladhesionprocess．TheoptimalMMZwascharacterizedbyXRD，SEM，FT-IR，TG-DSC，N2adsorptionisothermsandmagnetizationmeasurements．TheadsorptionoftheMMZforheavymetalionsWasstudied，andtheoptimaladsorptionconditions，adsorptioncapacityandadsorptionmecha

5、nismwerealsoexplored．ThroughtheexperimentsofmodificationforthenaturalzeoliteandofadsorptionforPb2+onthemodifiedzeolite，theconclusionCanbedrawnthatthemodifiedzeolitebyNaCIfNa—zeolite)hastheoptimaladsorptionforPb2+．TheadsorptionofPb2+ontheNa-zeoliteisdependentonpn,andthemaximumadsorptioncapacit

6、yofPb2+intheinitialconcentrationrangestudiedreaches66．99mg／g．Forthemagneticallymodifiednaturalzeolitesbychemicalmethod：N2adsorptionanalysisshowsthatthespecificsurfaceareasoftheMMZ(Ammonia)，MMZ(NaoH)andtheNa-zeoliteare100．90mz儋，64．02mz／gand25．13mz／g，respectively．AccordingtotheFT-IRspectra，thep

7、reparedMMZ(Ammonia)causeshiftoftheSi一0(Sior灿)at1054．5cm-1to1039．3cml，andtheshiftindicatesthattheFe3+cationssimilarwithA13+cationsembedintotheframeworkoftheNa-zeoliteduringpreparationprocess．Indifferentinitialconcentration，theadsorptiontestsII