Adsorption isotherm equation for coexistence of two kinds of metal ions in acidic solution on chelating resin.
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概要
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Adsorption isotherms for the coexistence of two metal ions (combinations of Zn<SUP>2+</SUP>, Cd<SUP>2+</SUP>, and Pb<SUP>2+</SUP>) in acidic solutions on chelating resins were measured at 25 °C. They were analyzed in relation to the adsorption isotherm equation of a single metal ion, <I>Q</I>=<I>Q</I><SUB>max</SUB>⁄(1+<I>AC</I><SUB>M</SUB><SUP>−α</SUP><I>C</I><SUB>H</SUB><SUP>β</SUP>), as was reported in the preceding paper. It is found that the adsorption isotherms of two metal ions (i and j) in acidic solution on chelating resins can be generally expressed by the equation;<BR><I>Q</I><SUB>i,j</SUB>=<I>Q</I><SUB>max</SUB>⁄{1+<I>A</I><SUB>i</SUB><I>C</I><SUB>i</SUB><SUP>−α<SUB>i</SUB></SUP><I>C</I><SUB>H</SUB><SUP>β<SUB>i</SUB></SUP>(1+<I>K</I><SUB>i,j</SUB><I>C</I><SUB>j</SUB><SUP>α<SUB>j</SUB></SUP><I>C</I><SUB>H</SUB><SUP>−β<SUB>j</SUB></SUP>)}<BR>over wide ranges of concentrations of the metal ion, <I>C</I>, and the hydrogen ion, <I>C</I><SUB>H</SUB> (mol dm<SUP>−3</SUP>). Where <I>Q</I><SUB>i</SUB> and <I>Q</I><SUB>i,j</SUB> are the adsorption amounts (m mol/g-dry resin) of i metal ion in the absence and in the coexistence of j metal ion. <I>Q</I><SUB>max</SUB> is the maximum adsorption amount, α and β are parameters in the adsorption of single metal solution, <I>A</I> and <I>K</I> are correction factors, and subscripts i and j identifing i and j metal ions. The adsorption capacities of two metal ions in acidic solution can be obtained from the isotherms parameters <I>A</I><SUB>i</SUB>, α<SUB>i</SUB>, α<SUB>j</SUB>, β<SUB>i</SUB> and β<SUB>j</SUB> for an individual single metal ion and only one additional parameter <I>K</I><SUB>i,j</SUB> is needed.
- 公益社団法人 日本化学会の論文
著者
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Urano Kohei
Department of Ecological Engineering, Toyohashi University of Technology Yokohama National University
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Urano Kohei
Department of Safety and Environmental Engineering, Yokohama National University
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Fujii Nobuhiko
Department of Safety and Environmental Engineering, Yokohama National University
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Fujii Nobuhiko
Department of Mathematics Tokai University
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