文献汇报PPT模版

在此输入标题副标题IntroductionExperimentalResultsanddiscussionConclusionIntroductionChitin(poly-β-(1,4)-N-acetyl-d-glucosamine)isthesecondmostabundantnaturalbiopolymeraftercelluloseandabasicstructuralcomponentoffungiandyeastcellwalls,aswellasofnumerousinvertebrates.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.Theinteractionmechanismsbetweenchitinanduranylwereexaminedwithsolid-stateNMR,infrared,Ramanaswellastime-resolvedlaserfluorescencespectroscopy.ExperimentalMarinespongeAplysinaaerophoba：collectedintheAdriaticSea(KotorBay,Montenegro)anddriedonair.NaOHplatelets：purchasedfromGrüssing(99%).Concentratedaceticacid：purchasedfromVWR(HPLCgrade).α-Chitin：purchasedfromCarlRothGmbH(depure).NaClO4·2H2O,NaOHandHCl：purchasedfromMerck(analyticalgrade).ConcentratedHNO3：purchasedfromCarlRothGmbH(analyticalgrade)anddistilledbeforeusage.A1000mg/lrhodiumsolution：purchasedfromMerck(ICP-MSstandard).UO2(ClO4)2：0.102MIonicstrength：0.5M(NaClO4)Resultsanddiscussion►Thespongechitiniscompletelyacetylatedwithinthelimitsofexperimentalerror.（甲基的相对强度为103%）►Theextractedfibersconsistofconcentricallyarrangedandlooselypackedtubularstructureswithhollowspacesinbetween.（由松散的同心排列的管状结构组成）►Chitinnetworksdriedwerethusnotusefulforadsorptionexperimentsanymore.Freeze-driedchitinmaintaineditsthreedimensionalshape.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.Itislikelythatasignificantpartofthewaterisstoredinthespaceswithinthefibers.（水是存储在在纤维空间的一个重要组成部分）►Chitinnetworksfrommarinespongeswereshowntobepromisingmaterialsforthepurificationofwaterfromuraniumcontamination.►Spongechitineffectivelysorbsuranyl.►Insummary,A.Aerophobaspongechitinisamaterialwithfavorablepropertiesforwaterpurificationbybothindustryandconsumers.Conclusion