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文献报告 报告人 报告时间 Adsorptioncharacteristicsofchitosanmodi edbychelatingagentsofanewgeneration 1 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 TheeffectofCSmodi cationbypreparingthebeadcrosslinkedbyglutaraldehydeandepichlorhydrinwasalsotested Adsorptioncharacteristicsofchitosanmodi edbychelatingagentsofanewgeneration 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 Adsorptioncharacteristicsofchitosanmodi edbychelatingagentsofanewgeneration 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 DorotaKo odynskaChemicalEngineeringJournal179 2012 33 43 Adsorptioncharacteristicsofchitosanmodi edbychelatingagentsofanewgeneration 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 DorotaKo odynskaChemicalEngineeringJournal179 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 Adsorptioncharacteristicsofchitosanmodi edbychelatingagentsofanewgeneration Fig 1 EffectofpHontheadsorptioncapacitiesofCu II Zn II Cd II andPb II complexeswithIDSandEDDSonCS EffectofpHandmechanismofadsorption bindingsiteswerenotavailable thepotentialsorptionmechanism electrostaticinteractions chemicalinteractions Ontheotherhand the steric effectmakesitdif cultforCu II EDDScomplexestoapproachaminogroups Adsorptioncharacteristicsofchitosanmodi edbychelatingagentsofanewgeneration enlargethespace improvingtheaccessibilityofaminogroups whichisveryimportantforM II ionssorption TheiminebondintheGLA cross linkedCSisalsocapableofadsorbingM II ions GLAtendstocross linkCSbondingthroughtheaminogroupsandEPIthroughthehydroxylgroups thepolymerhydrophobiccharacterchangesanddiffusionofmetalionsintothenetbecomesslowerandthereforedifferentforGLAandEPI ItcanbeduetothefactthatinthepresenceofSO42 ionsCSexhibitsthehighestswellingdegreeincomparisontothepresenceofCl andNO3 ionsaswellasthelowestmechanicalresistance Therefore onlyinthecaseofSO42 ionstheincreaseoftheadsorptioneffectivenesswasobserved Adsorptioncharacteristicsofchitosanmodi edbychelatingagentsofanewgeneration 亮点 Themaingoaloftheinvestigationistomaximizethede uoridationcapacity DC ofchitosanbeads CB bythesubstitutionoffunctionalgroupssuchasorganicacidsontohydroxylgroupsandchelationofaminegroupswithFe3 ion Fe CCB NatrayasamyViswanathan S MeenakshiJournalofFluorineChemistry129 2008 503 509 Selectivesorptionof uorideusingFe III loadedcarboxylatedchitosanbeads Selectivesorptionof uorideusingFe III loadedcarboxylatedchitosanbeads ThepHzpcofCBis7 88whereasforFe CCBitwasshiftedto3 22whichclearlyindicatestheoccurrenceofstructuralchangesinFe CCB Selectivesorptionof uorideusingFe III loadedcarboxylatedchitosanbeads Selectivesorptionof uorideusingFe III loadedcarboxylatedchitosanbeads Modi edcoconutshell bers Agreenandeconomicalsorbentfortheremovalofanionsfromaqueoussolutions 亮点 Thepowderofgreencoconutshell CoconusciferaL waschemicallymodi edandusedtoremoveinorganicanions PO43 SO42 andNO3 fromaqueoussolutionthroughbatchprocess Thesolidwasmodi edwithammoniumquaternarysalt 2 hidroxypropyltrimethylammoniumchloride 400mLofa1 CaCO3 Then thesolidwaswashedthoroughlyanddriedinanovenat60 Cfor2h Thepowderwaschemicallymodi edbyadding1 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 controlledremovalpro