首页> 外文期刊>Separation and Purification Technology >Amelioration of extraction-separation efficiency of Zn(II),Cd(II)and Pb(II)ions with bis(2-ethylhexyl)phosphoric acid in the presence of a water-soluble N4-type Schiff base ligand
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Amelioration of extraction-separation efficiency of Zn(II),Cd(II)and Pb(II)ions with bis(2-ethylhexyl)phosphoric acid in the presence of a water-soluble N4-type Schiff base ligand

机译:在水溶性N4型席夫碱配体存在下用双(2-乙基己基)磷酸改善Zn(II),Cd(II)和Pb(II)离子的萃取分离效率

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摘要

The separation of zinc,cadmium and lead ions by bis(2-ethylhexyl)phosphoric acid(DEHPA)dissolved in cyclohexane has been improved in the presence of aqueous N,N'-bis(2-pyridylmethylidene)-1,2-diiminoethane(BPIE),as a selective masking agent.The interaction between metal ions and BPIE results a shift in the extraction curve of the studied metal ions versus pH towards higher pH region.The displacement of the extraction curves varies as Zn~(2+)< Pb~(2+)< Cd~(2+).The analysis of extraction data makes possible the evaluation of stability constant of the [M(BPIE)]~(2+)complexes(M = Zn,Cd or Pb)in the aqueous phase.The influence of temperature on the extraction of studied metal ions from aqueous phase in the absence and the presence of BPIE was tested in the range 288-303 K.This investigation allows evaluating the thermodynamic parameters associated with the extraction process,and those of the complexation of cations by BPIE in the aqueous phase.
机译:N,N'-双(2-吡啶基亚甲基)-1,2-二亚氨基乙烷水溶液(存在于水溶液中)改善了溶于环己烷中的双(2-乙基己基)磷酸(DEHPA)对锌,镉和铅离子的分离金属离子与BPIE之间的相互作用导致所研究的金属离子相对于pH的萃取曲线向较高的pH区域移动。萃取曲线的位移随Zn〜(2 +)< Pb〜(2 +)

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