Synthesis of Picolinamide and its Extraction Performance for Uranium(Ⅵ)

A novel chelating extractant,1-(2-pyridyl)-1-pyrrolidyl-1-methanone,is synthesized from picolinic acid and pyrrolidine and identified by IR, ~1 H MNR and GC-MS. The influence of various factors on the extraction of U(Ⅵ) from aqueous nitric acid solutions with this picolinamide (L) is studied,including diluent,extractant concentration, acidity of aqueous phase,ionic strength of salting-out agent and temperature. The extracted species is deduced to be UO_2(NO_3)_2·L from the experimental results. No emulsification or third-phase formation is observed.