Impregnation of different ionic liquids onto cationic starch and their comparison in the extraction of Th(IV)
Impregnation of different ionic liquids onto cationic starch and their comparison in the extraction of Th(IV)
Cationic starch (CS) was prepared by using epichlorohydrin (EPI) and 3-chloro-2-hydroxypropyltrimethylammonium chloride (CHPTMA) and ionic liquids (ILs) having different anionic groups [1-butyl-3-methyl imidazolium tetrafluoroborate (BMI+BF−4), 1-butyl-3-methyl imidazolium bromide (BMI+Br−), 1-butyl-3-methyl imidazolium hexafluorophosphate (BMI+PF−6), and 1-butyl-3-methyl imidazolium bis-[(trifluoromethyl)sulfonyl]imide (BMI+[(TF)2N]−)] were impregnated onto CS. Thorium(IV) ions were preconcentr