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在此输入标题副标题在此输入标题副标题1目录

Introduction

Experimental

Resultsanddiscussion

Conclusion

目录Introduction2IntroductionChitin(poly-β-(1,4)-N-acetyl-d-glucosamine)isthesecond

mostabundantnaturalbiopolymeraftercelluloseandabasic

structuralcomponentoffungiandyeastcellwalls,aswellasof

numerousinvertebrates.自然界中含量仅次于纤维素的一种天然高聚物Thechitin-basedscaffoldsrecentlyfoundbyourgroupsinmarinespongesarethree-dimensionalnetworksoftube-likeinterconnectedfiberswithadiameterofabout100μminthecaseofAplysinaaerophoba.支架是通过直径约100μm的管状纤维连接形成的三维网络Theadsorptionbehaviorwastestedinlifelikeconcentrationranges.Wefurtherattemptedtodesorbtheuranylinordertorecoverthespongechitinandmakeitreusable.Thekineticsoftheadsorptionprocesswereexaminedtodeterminethetimeneededfortheadsorption.The

interaction

mechanismsbetweenchitinanduranylwereexaminedwithsolid-stateNMR,infrared,Ramanaswellastime-resolvedlaserfluorescencespectroscopy.IntroductionChitin(poly-β-(3ExperimentalMarinespongeAplysinaaerophoba

：collectedintheAdriaticSea(Kotor

Bay,Montenegro)anddriedonair.NaOHplatelets

：purchased

fromGrüssing(99%).Concentratedaceticacid

：purchasedfrom

VWR(HPLCgrade).α-Chitin

：purchasedfromCarlRothGmbH(depure).NaClO4·2H2O,NaOHandHCl

：purchased

fromMerck(analyticalgrade).ConcentratedHNO3

：purchased

fromCarlRothGmbH(analyticalgrade)anddistilledbeforeusage.A1000mg/lrhodiumsolution

：purchasedfromMerck(ICP-MSstandard).UO2(ClO4)2

：0.102MIonicstrength：0.5M(NaClO4)

ExperimentalMarinespongeAply4Resultsanddiscussion

Thespongechitiniscompletelyacetylatedwithinthe

limitsofexperimentalerror.（甲基的相对强度为103%）Theextractedfibersconsistof

concentricallyarrangedandlooselypackedtubularstructures

withhollowspacesinbetween.（由松散的同心排列的管状结构组成）

Chitinnetworksdriedwerethusnotusefulforadsorption

experimentsanymore.

Freeze-driedchitinmaintaineditsthreedimensional

shape.Thespecificsurfaceoffreeze-driedsampleswas4m2/g.However,uranyladsorptiondidnotyieldreproducibleresultsforfreeze-driedspongechitin.Thesurfaceareavaluemightbehigherinhydratedchitin.（水合甲壳素的比表面积值可能更高）

ThehydratedspongechitinfromA.aerophobastillcontainedapprox.90wt%water.Itislikelythatasignificantpartofthewaterisstoredin

thespaceswithinthefibers.（水是存储在在纤维空间的一个重要组成部分）ResultsanddiscussionTh5Chitinnetworksfrommarinespongeswereshowntobepromisingmaterialsforthepurificationofwaterfromuraniumcontamination.Spongechitineffectivelysorbsuranyl.Insummary,A.Aerophobasp