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ppt免费模板Fourshortwordssumupwhathasliftedmostsuccessfulindividualsabovethecrowd:alittlebitmore.------------------------------------------author------------------------------------------dateAdsorptioncharacteristicsofchitosanmodifiedbychelatingagentsofanewgeneration1、RemovalofCu(II),Zn(II),Cd(II)andPb(II)complexeswithIDS(iminodisuccinicacid亚氨基二琥珀酸)andEDDS(ethylenediaminedisuccinicacid乙二胺二琥珀酸)fromthesyntheticaqueoussolutionsthroughadsorptiononchitosan(CS)contacttime(1–120min),pHvalues(1–12),temperatures(20–50◦C)hasbeeninvestigated.3、TheeffectofCSmodificationbypreparingthebeadcrosslinkedbyglutaraldehydeandepichlorhydrinwasalsotested.Adsorptioncharacteristicsofchitosanmodifiedbychelatingagentsofanewgeneration这两种配体（亚氨基二琥珀酸和乙二胺二琥珀酸）属于两种新的氨基多羧基型氨羧络合物，与传统的EDTA相比较，有高的生物可降解性能。Adsorptioncharacteristicsofchitosanmodifiedbychelatingagentsofanewgeneration在不同配体纯在下，用壳聚糖吸附重金属的研究很少，原因是溶液中的配体会阻碍重金属的回收。羧酸类物质不仅可以作为重金属离子的配体，而且还可以与壳聚糖的氨基相互作用形成酰胺键。羧酸的COO−与壳聚糖的氨基之间还有静电作用。与氨基相比，酰胺键与对金属的绑缚能力比较弱。另一方面，羧酸类物质的其他基团也可以作为金属离子的配体，从而影响重金属的吸附。DorotaKołodynskaChemicalEngineeringJournal179(2012)33–43Adsorptioncharacteristicsofchitosanmodifiedbychelatingagentsofanewgeneration亮点:假设：IDSandEDDS,areconnectedwithmetalionsintheformofthecomplexeslike[M(ids)]2−and[M(edds)]2−,whereM(II)isCu(II),Zn(II),Cd(II)andPb(II)wasmade.theapplicationofCSforheavymetalanioniccomplexesremovalfromsyntheticaqueoussolutionwasstudied.DorotaKołodynskaChemicalEngineeringJournal179(2012)33–43壳聚糖的吸附性能与它的高疏水性能有关（羟基、氨基、羧甲基），高密度的氨基和羧甲基使壳聚糖能与带负电的物质发生反应.改变pH能调节壳聚糖的质子化和去质子化能力。pH由1到6，是壳聚糖的氨基质子化的过程，随着pH增大，质子化程度从100%降到76%。pH高于8，壳聚糖完全去质子化，不能吸附重金属离子。AdsorptioncharacteristicsofchitosanmodifiedbychelatingagentsofanewgenerationFig.1EffectofpHontheadsorptioncapacitiesofCu(II),Zn(II),Cd(II)andPb(II)complexeswithIDSandEDDSonCSEffectofpHandmechanismofadsorptionbindingsiteswerenotavailablethepotentialsorptionmechanism：electrostaticinteractionschemicalinteractionsOntheotherhand,the‘steric’effectmakesitdifficultforCu(II)–EDDScomplexestoapproachaminogroups.Adsorptioncharacteristicsofchitosanmodifiedbychelatingagentsofanewgenerationenlargethespace，improvingtheaccessibilityofaminogroups,whichisveryimportantforM(II)ionssorption.TheiminebondintheGLA-cross-linkedCSisalsocapableofadsorbingM(II)ions.GLAtendstocross-linkCSbondingthroughtheaminogroupsandEPIthroughthehydroxylgroups.thepolymerhydrophobiccharacterchangesanddiffusionofmetalionsintothenetbecomesslowerandthereforedifferentforGLAandEPI.ItcanbeduetothefactthatinthepresenceofSO42−ionsCSexhibitsthehighestswellingdegreeincomparisontothepresenceofCl−andNO3−ionsaswellasthelowestmechanicalresistance.Therefore,onlyinthecaseofSO42−ionstheincreaseoftheadsorptioneffectivenesswasobserved.Adsorptioncharacteristicsofchitosanmodifiedbychelatingagentsofanewgeneration亮点:Themaingoaloftheinvestigationistomaximizethedefluoridationcapacity(DC)ofchitosanbeads(CB)bythesubstitutionoffunctionalgroupssuchasorganicacidsontohydroxylgroupsandchelationofaminegroupswithFe3+ion(Fe-CCB).NatrayasamyViswanathan,S.MeenakshiJournalofFluorineChemistry129(2008)503–509SelectivesorptionoffluorideusingFe(III)loadedcarboxylatedchitosanbeadsSelectivesorptionoffluorideusingFe(III)loadedcarboxylatedchitosanbeadsThepHzpcofCBis7.88whereasforFe-CCBitwasshiftedto3.22whichclearlyindicatestheoccurrenceofstructuralchangesinFe-CCB.SelectivesorptionoffluorideusingFe(III)loadedcarboxylatedchitosanbeadsSelectivesorptionoffluorideusingFe(III)loadedcarboxylatedchitosanbeadsModifiedcoconutshellfibers:Agreenandeconomicalsorbentfortheremovalofanionsfromaqueoussolutions亮点：Thepowderofgreencoconutshell(CoconusciferaL.)waschemicallymodifiedandusedtoremoveinorganicanions（PO43−,SO42−andNO3−）fromaqueoussolutionthroughbatchprocess.Thesolidwasmodifiedwithammoniumquaternarysalt(2-hidroxypropyltrimethylammoniumchloride)400mLofa1%CaCO3.Then,thesolidwaswashedthoroughlyanddriedinanovenat60◦Cfor2h.Thepowderwaschemicallymodifiedbyadding1.2mLofa5M(NaOH,Vetec)pergramofbagasse,followedbyrestfor1h.About1mLof3-chloride2-hydroypropyltrimethylammoniumchloridesolutionwasaddedtothetreatedpowderbagasseunderroompressureinordertofavorastrongerinteractionbetweenthereactantsandthecoconutbagasse.Theabovementionedmethodologywasusedtomodifythesurfaceoftheadsorbent,byremovingthelignocellulosesconstituents.吸附剂改性：季碱化反应步骤：Highlight:详细探讨了磷酸根和铬酸根吸附的行为。研究了铬酸根和磷酸根吸附中间产物的形态。并揭示了反应生成物与溶度积之间的关系。Hydrocalumite(Ca2Al–Cl–LDH)的稳定性研究前2h内，Ca、Al、pH迅速上升。8hCa、Al含量分别为5.7和2.9pH为12。溶解过程导致Ca的释放和pH的上升。chromateandphosphate热力学沉淀物的结构分析24h后，水铝钙石结构完全小消失高的pH抑制了水铝钙石的溶解产品的相变化，不依赖于pH.铬酸根的吸附是与氯离子交换Ksp-controlledremovalprocess：离子浓度积(CP)与Ksp比较吸附机理：Obviously,itissupposedthatboththedissolution–reprecipitationinPremovalandanionexchangeprocessinCr(VI)removalwerecontrolledbytheKspoftheproductwhichhasthelowestKspvalueamongthepossibleprecipitates.THANKS