Microcapsules containing ionic liquid [A336][P507] for La³⁺/Sm³⁺/Er³⁺recovery from dilute aqueous solution

王月¹，王运东¹，靖宇^1,2，陈继²，刘郁²

1. State Key Laboratory of Chemical Engineering, Department of Chemical Engineering, Tsinghua University2. State Key Laboratory of Rare Earth Resources Utilization, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences

摘 要：The efficacy of polysulfone microcapsules encapsulating ionic liquid [trialkylmethylammonium][di（2-ethylhelxyl） orthophosphinate]（[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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