双水相萃取法分离铍(Ⅱ)、铁(Ⅲ)与铁(Ⅱ)、铬(Ⅲ)、锰(Ⅱ)、铝(Ⅲ)

Separation of Be(Ⅱ),Fe(Ⅲ),Fe(Ⅱ),Cr(Ⅲ),Mn(Ⅱ) and Al(Ⅲ) by Binary Aqueous Phase Extraction

摘要: 研究了在聚乙二醇2000(PEG)-硫酸钠(Na2SO4)-邻苯二酚紫(PV)体系中铍(Ⅱ)、铁(Ⅲ)、铁(Ⅱ)、铝(Ⅲ)、铬(Ⅲ)、锰(Ⅱ)的萃取行为.试验结果表明,铍(Ⅱ)在pH 3.5~7.0及铁(Ⅲ)在pH 4.0~7.0范围内可以被PEG相几乎完全萃取,而铝(Ⅲ)、铬(Ⅲ)在pH 1.0~7.0、锰(Ⅱ)在pH 1.0~4.5、铁(Ⅱ)在pH 1.0~4.5则不被萃取.从而实现了将铍(Ⅱ)(pH 3.5)、铁(Ⅲ)(pH 5.0)与铝(Ⅲ)、铬(Ⅲ)、锰(Ⅱ)、铁(Ⅱ)混合离子的定量分离.同时探讨了PEG相的萃取机理.

Abstract: The behaviors and conditions of separation of pyrocatechol violet complexes of Be(Ⅱ),Fe(Ⅲ),Fe(Ⅱ),Cr(Ⅲ),Mn(Ⅱ) and Al(Ⅲ) by the binary aqueous phase extraction system of polyethylene glycol 2000 (PEG-2000)-Na2SO4-pyrocatechol violet (PV) were studied systematically.As shown by experimental results that Be(Ⅱ) in solution of pH 3.5-7.0,and Fe(Ⅲ) in solution of pH 4.0-7.0 were almost completely extracted into the PEG phase,while Al(Ⅲ) and Cr(Ⅲ) in solution of pH 1.0-7.0,Mn(Ⅱ) in solution of pH 1.0-4.5 and Fe(Ⅱ) in solution of 1.0-4.5 were not extracted.Be(Ⅱ) in solution of pH 3.5 and Fe(Ⅲ) in solution of pH 5.0 were quantitatively separated from Fe(Ⅱ),Al(Ⅲ),Cr(Ⅲ) and Mn(Ⅱ) ions in their mixed solutions.The mechanism of extraction of complexes of PV with related ions in the PEG phase was studied preliminarily.