阳离子纤维素的制备及其絮凝和染料吸附性能研究

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1、中国科学技术大学硕士学位论文阳离子纤维素的制备及其絮凝和染料吸附性能研究姓名：陶洪云申请学位级别：硕士专业：物理化学指导教师：闫立峰20080501ABSTRACT—-_-——————————————————————————————-——————_———————_—————一_一一Celluloseisthemostabundantorganicmattersinthenature，andcontainsmanyhydroxylsinitsmolecularchain．Thecelluloseproper

2、tiescanbechangedthroughhydroxylationsuchasesterification，etherification，oxidationandcrosslir出洫g．Cellulosederivativestake0nmanycharactersinheritedfromnaturalpolymers。includingnonpoisonous，completelybiodegradationandsoundlyrecyclationinnature，etc；andalsoman

3、yspecialcharacters．Thesespecialcharactersmakecellulosederivativesplayimportantrolesincommodities，papermaking，textile，foods，dyestuffs，pharmacy,wastewatertreating，adherenceandexploitationofgasoline．etc．Forthedrying-uppetroleumandcoal，seriousenergysourceexha

4、ustionscrisisandenvironmentalpollution，R&Dandapplicationofcellulosederivativeshavea仕ractedalotofattention．Cationiccellulosetakesonsuperiorpropertiesinwastewatertreatingbecauseofitscationicgroups．Inthispaperwehavesynthesisedseveralcationiccellulosewithdiff

5、erentdegreesofsubstitution(DS)．Furthermore，weapplythesesamplesasflocculantsanddyeabsorbentsinwastewatertreatments．Themainconclusionsareshowedbelow：(1)Thecationiccelluloseweresynthesisedwithcelluloseand2,3．epoxypropyl．trimethylammonium．(a)AhigherDScationic

6、celluloseWaShomogeneouslvsynthesisedinNaOH／Ureaaqueoussoluton．The13C-NMRspectrumshowedamoreuniformdistributionofthesubstituentsonglucoseunit．Co)AwaterinsolublecationiccelluloseWaSsynthsisedwithaslurrysystem．Thedegreesofsubstitutionofthemaremorelowerthanth

7、atwiththehomogeneousmethod．(2)TheflocculationresultofcationiccellulosesampleswithdifferentDSunderhomogeneoussystematdifferentpHweretakenoutinkaolinsuspension，whichsimulatedwastewater．Theexperimentsresultsdemonstratedthatasanocculantthecationiccellulosesho

8、wedaenoughflocculationcapacityatawidepHrange，especiallyunderneutralandalkalineconditions．Anditsmainflocculation．Ⅱ．ABSTRACTmechanismwasneutralizationandbridgedadsorption．(3)Thecationiccellulosesynthsisedinslurrysyste