Solvent Extraction of Divalent Metal Ions Using 2-Pyridinealdoxime in Ionic Liquid

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The extraction and separation of the divalent metals was studied by using ionic liquid, 1-butyl-3-methylimidazolium hexafluorophosphate (BMIM-PF6) including the extractant of 2-pyridinealdoxime (2-PA) . The divalent metals used here are Cd2+ and Pb2+ for the toxic and Ni2+ and Zn2+ for the valuable metals in industry. These metal ions in potassium nitrate of 0.10 mol dm-3 concentration were examined to be extractable. It was observed that Cd2+ was extracted into ionic liquid phase better than Pb2+ and Zn2+ in the pH range of 5.15-9.83 and its extractability was reached to >99% in the pH of 7.93-9.83. The extraction equilibrium of Cd2+ with 2-PA into BMIM-PF6 was found to be Cdcit (w) -+3HL (o) _??_CdL2HL (o) +2H++cit3-, whose mechanism is the same way as that into chloroform (CHCl3) . The mutual separation of Cd2+, Pb2+, Ni2+, and Zn2+ can be achieved by using the different pH values of the aqueous phase in 2-PA/BMIM-PF6 extraction system. From these results, it can be stated that the 2-PA/BMIM-PF6 extraction system is useful to extract and separate the divalent metal ions examined in this work.
日本イオン交換学会の論文