The efficacy of polysulfone microcapsules encapsulating ionic liquid [trialkylmethylammonium][di(2-ethylhelxyl) ortho-phosphinate] ([A336][P507]) for the extraction of La3+, Sm3+ and Er3+ from dilute aqueous solutions was investigated. Microcapsules were synthesized using coaxial microfluidic method, and subsequently encapsulated with extractant [A336][P507]. The kinetics data were fitted well by pseudo-second-order equation and Crank model, and the kinetics parameters were evaluated. The extraction rate had the order of Er3+>Sm3+>La3+. The isotherm data were analyzed by Langmuir model and shifted Langmuir model. The extraction capacities of La3+, Sm3+ and Er3+ were 58.4, 56.6 and 81.7 mg/g, respectively. The dependency of stripping performance on HNO3 concentration was measured. The regeneration of microcapsules was evaluated using cycling extraction experiments.
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