Investigation of silica confined ionic liquid sorbents for solid phase extractions

• Main Authors: Che-wei Chou, 周哲維
• Other Authors: Guor-Tzo Wei
• Format: Others
• Language: zh-TW
• Published: 2010
• Online Access: http://ndltd.ncl.edu.tw/handle/03006565120684096729

碩士 === 國立中正大學 === 化學所 === 98 === This work studies the use of polymeric ionic liquids as the sorbents of solid phase extraction(SPE).Though the SPE sorbents have already been commercize produced,the study of SPE sorbents are still going on.The main reason is due to the limitations of the SPE sorbents,for example,can not being able to test the sample of both anion and cation at the same time.They have to go through multisteps,complicate procedures,and long preparation time.Ion liquids are melting salts with ignore vaporize.The have the dual nature of both the cation and anion.They have high solubilities for polar or nonpolar compounds.If we use the ionic liquids as the stationary phase of the SPE,then maybe they can absorb and extract both the cation samples and anion samples at the same time.This could highly increase the applications of the SPE of ILs. In this work,we covalently bonded the functional groups of the ionic liquid on the surface of silica gel as SPE sorbents.Then the extraction efficiencies and seletivities of cation,anion,and netural compounds were examined.The results show that SiO2-DVB-VBBI can absorb netural and acidic compounds.In addition addition of divinylbenzene as the functional group of sorbents can increase the absorption of the netural compounds,as compared with those of SiO2-VBBI.Further more,SiImBS was shown to high absorb efficiency for basic compounds,it is a new developed stationary phase from our study. The extraction and desorption hehaviors of the sorbents from this study can be applied to the development of chromatographic column.By the preliminary data of chromaogric separation with SiO2- are presented to demonstate the potential of this stationary phase in chromatogric separations.