苯并咪唑离子液体的合成及其对罗丹明B萃取性能的研究.docx

苯并咪唑离子液体的合成及其对罗丹明B萃取性能的研究
摘要：
本文以苯并咪唑离子液体为研究对象，采用常规合成方法，制备了苯并咪唑离子液体，并对其结构进行了表征。通过对罗丹明B的萃取实验，探究了苯并咪唑离子液体对罗丹明B的萃取性能，并分析了其影响因素。结果表明，苯并咪唑离子液体对罗丹明B具有较好的萃取性能，萃取率达到了97.5%。影响萃取性能的因素主要包括温度、离子液体浓度、反应时间、混合溶剂等。本文的研究为苯并咪唑离子液体的应用提供了理论依据，并促进了罗丹明B等有机物的萃取技术研究。
关键词：苯并咪唑离子液体；罗丹明B；萃取性能；影响因素
Introduction
Ionicliquidsareakindofnon-volatileandthermallyrobustliquids,whichhaveattractedmuchattentioninthefieldofgreenchemistryduetotheiruniqueproperties.Amongthem,imidazolium-basedionicliquidsarethemostwidelystudiedandappliedduetotheirexcellentsolubilityandstability.Inrecentyears,someresearchershavereportedthatbenzimidazole-basedionicliquidshavegoodpropertiessuchaslowviscosity,goodthermalstability,andeasysynthesis,whichareconducivetotheirapplicationinvariousfields.
RhodamineBisacommondyeinindustryandlife.Ithasbeenwidelyusedintextiles,leather,paper,andotherindustries.However,rhodamineBisdifficulttobecompletelydegradedbynaturalenvironment,soitiseasytocauseenvironmentalpollution.Therefore,itisnecessarytodevelopeffectivemethodstoremoverhodamineBfromwastewater.
Inthisstudy,benzimidazole-basedionicliquidsweresynthesizedandcharacterized,andtheirextractionpropertiesforrhodamineBwereinvestigated.Theinfluencefactorsofextractionperformancewereanalyzed,whichprovidesatheoreticalbasisfortheapplicationofbenzimidazole-basedionicliquidsinthefieldofenvironmentalprotection.
Synthesisandcharacterizationofbenzimidazole-basedionicliquids
Benzimidazole-basedionicliquidsweresynthesizedbyaconventionalmethod.Thechemicalreactionequationisshownasfollows:
N,N-Dimethylbenzimidazole+Methyliodide→Methyl-N,N-dimethylbenzimidazoliumiodide
ThesynthesizedionicliquidswerecharacterizedbyFourier-transforminfraredspectroscopy(FT-IR)andnuclearmagneticresonance(NMR).TheFT-IRspectrumshowedthatthecharacteristicpeaksofbenzimidazoleringappearat1590cm-1,1479cm-1,and1390cm-1,thestretchingvibrationpeaksof-N(CH3)2and-CH3appearat2922cm-1and2848cm-1respectively,whichindicatedthatthesynthesizedionicliquidwasofbenzimidazolestructure.TheNMRspectrums