羥基自由基對碳納米管的化學改性.pdf

1、華東師范大學碩士學位論文羥基自由基對碳納米管的化學改性姓名：李偉申請學位級別：碩士專業(yè)：分析化學指導教師：成榮明20050401AbstractAsanewmolecularformofcarboninthefullerenefamilytherehasbeenincreasinginterestincarbonnanotubes(CNTs)becauseoftheirstructural，electronicandmechanical

2、propertiesnleinitialstudiesfocusedonpreparationandpurificationtechniquesaswellaSonunderstandingthestructureandphysicalpropertiesofthepristinenanotubesInrecentyears，howeverchemicalfunctionalizationofCNTshasattractedgreata

3、aentionandeffortstomodifytheirchemicalandphysicalproperties，andexpandtheirapplicationareasItiswellknownthatFentonoxidationsystemisakindofadvancedoxidationprocess(AOP)forexistenceofhydroxylradical(HO)whichCallbegeneratedb

4、yFentonlSreagentsrFe2／H202)NoticeablyHohasdoublepropertiesofoxidisabilityandelectrophilicreactivityOntheonehand，HOisknownasoneofthemostactiveoxidantswhichhasahigheroxidationpotentialthanotheroxidantsexceptforfluorineOnth

5、eotherhand，HOCallaaackthehighelectrondensitysitesasanelectrophilicreagentandeasilycarryoutelectrophilicadditionreactionwitlltheunsaturatedsubstancesabundantwithⅡ一bondingelectrons，suchasalkenes，alkynes，aromaticcompoundsan

6、dfullenesaswellFurthermore，consideringthatCNTsareassembliesofconcentricsp‘bondedcarbontubulesmadeofrolled—upgraphitesheetsSothereareplentifulⅡbondingelectronsinnanotubeframeworkHerebyweconcludethatfunctionalizationofCNTs

7、couldbeachievedviaelectrophilieadditionandoxidationreactionofHOThispapermainlyconsistsoffivepartsasfollows：Partone“PreparationandpurificationofcarbonnanotubesInOurpaperthepristineCNTssynthesizedbycatalyticchemicalvapourd

8、eposition(CCVD)methodcontainscatalyticparticlesandthecarbonaceousimpuritiesSoitisnecessarytoeliminatetheseimpuritiesbeforetheexperimentInthiswork，wedevelopedatwosteppurificationmethodtoremovetheabovementionedimpuritiesnl

9、cpurificationprocedurewasasfollows：FirstlythepristineMWNTssampleWaScalcinedinairatcertaintemperatureforsometimeThetemperatureofairoxidationofCNTsWaSdeterminedbyTGAThusthecarbonaceousimpuritieswereremovedeffectivelyAtiera

10、iroxidationtreatment，theresidualpowdersweresubmergedintoallacidsolutionandsimultaneouslysonicatedforsometime，thenthesolutionWaScentrifugedandfilteredInthisstep，thecatalyticparticleswereremovedTheexperimentalresultswerein