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 preconcentrated by using IL impregnated CS. |
