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KMID : 1024519950040020223
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Journal of the Environmental Sciences
1995 Volume.4 No. 2 p.223 ~ p.232
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Emulsion Liquid Membrane Transport of Heavy Metal Sons by Macrocyclic Carriers
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Jung Oh-Jin
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Abstract
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New two macrocyclic compounds using as carriers of liquid emulsion menbrame, have been synthesized. These reuslts provide evidance for the usefulness of the theory in designing the systems. The efficiency of selective transport for heavy metal ions have been discussed from the membrane systems that make use of ,<>,,CN- and ion as co-anions in source phase and make use of and ion as receiving phase, respectively. The transport rate of M(II) was highest when a maximum amount of the M(II) in the source phase was present as, and Pd(CN). The Cd(II) and Pb(II) over each competitive cations were well transprted with 0.3M-S2032- and 0.3M-P2O74-, respectively in the receiving phase. Results of this study indicate that two criteria must be met in order to have effective macrocycle-mediated transport in these emulsion system. First one must effective extraction of the into the toluene systems. The effectiveness of this extraction is the greatest if locK for macrocycle interaction is large and if the macrocycle is very insoluble in the aqueous phase. Second, the ratio of the locK values (or Mn+-receiving phase (- or ) to -macrocycle ((이나 ) interaction must be large enough to ensure quantitative stripping of Mn+((,)at the toluene receiving Phase interface. (3.5-benzo-10,13,18,21-tetraoxa-1,7,diazabicyclo(8,5,5) eicosan) forms a stable ( and >, complexes and is very insoluble in water and its and >, complex is considerably less stable than -(S2O3)22- and complexes. On the other hand, the stability of the )+-( complex exceed that of the - (S2O3)22- and Hg2+-P2O74-, and the distribution coefficient of (5,8,15,18,23,26-hexaoxa-1,12- diazabicyclo-(10,8,8) octacosane) is much smaller than that of . Therefore, the partitioning of Lr is favored by the aqueous receiving Phase, and little heavy metal ions transport is seen despite the large logK for +- and (+, + and )- interactions. Key Words : macrocycles, transport, heavy metal, co-anion, source phase, receiveing, complex separation, interaction, destribution coefficient.
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KEYWORD
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macrocycles, transport, heavy metal, co-anion, source phase, receiveing, complex separation, interation, destribution coefficient
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