A polymer inclusion membrane (PIM) containing commercial ionic liquid methyltrioctylammonium chloride (Aliquat 336) as a carrier and cellulose triacetate (CTA) base has been used for the first time to remove fluoride from natural waters. Due anion-exchange characteristics of carrier, 1 M NaCl solution receiving phase. It found that addition tributyl phosphate (TBP) in formulation PIM increased ...