Four ionic liquids with cation 3-tetradecyl-1-vinylimidazole (VIC14) and anions tetrafluoroborate [BF4]-,hexafluorophosphoric acid [PF6]-,trifluoromethanesulfonic acid[CF3SO3]-,and bis(trifluoromethanesulfonyl) [NTf2]- were synthesized by anion-exchange reaction.These ionic liquids were then polymerized with divinylbenzene to obtain four polyimidazolyl ionic liquids (PVIC14-NTf2,PVIC14-CF3SO3,PVIC14-PF6 and PVIC14-BF4).Their structures were characterized by FT-IR,XPS,SEM,and BET,and the dynamic adsorption performance,cyclic adsorption performance and adsorption mechanism for toluene were investigated.It was found that the polyionic liquids with the anion of [NTf2]- had the highest adsorption amount of toluene,reaching 454.5mg/g,followed by [CF3SO3]- and the lowest was [BF4]-.The cyclic adsorption performance of PVIC14-NTf2 was investigated by using high temperature nitrogen purge desorption,and the adsorption amount decreased to 431.8mg/g after cyclic adsorption and desorption five times,with a total adsorption efficiency reduction of less than 5%.Fitting of the adsorption process revealed that the adsorption mechanism was in accordance with Bangham's kinetic model and Langmuir isothermal adsorption model.
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基金资助
国家自然科学基金(22166013)
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