Adsorption mechanism of trivalent metal ions on chelating resins containing iminodiacetic acid groups with reference to selectivity
Adsorption mechanism of trivalent metal ions on chelating resins containing iminodiacetic acid groups with reference to selectivity
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DOI：
10.1021/ac9612685
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发表时间：
1997-08-01
影响因子：
7.4
通讯作者：
Wada, H
中科院分区：
文献类型：
--
作者：
Yuchi, A;Sato, T;Wada, H
本文研究了含亚氨基二乙酸（-LH_2）螯合树脂对七种三价金属离子（M~（3+）：Sc~（3+）、Y~（3+）、La~（3+）、Fe~（3+）、Al~（3+）、Ga~（3+）、In~（3+））的吸附平衡。在金属离子相对于螯合基团过量的条件下测量的吸附曲线直接指示了在树脂相中形成的络合物的金属与配体的比率，铁和第13族金属离子以（-L）（2）HM吸附，而第3族金属离子以（-L）（3）H3M和（-L）（2）HM吸附，（-L）（2）HM对所有金属离子的吸附常数与水溶液中亚氨基二乙酸络合物的形成常数有很好的相关性，由于（-L）（3）的形成，第3族金属离子的实际吸附显著增强，超出了该相关性的预期H3M这就是为什么三价金属离子的吸附选择性不同于亚氨基二乙酸在水溶液中的络合，阴离子和亚氨基二乙酸基团的数量的影响。每单位重量的树脂也进行了讨论。
The adsorption equilibria of seven trivalent metal ions (M3+: Sc3+, Y3+, La3+, Fe3+, Al3+, Ga3+, and In3+) on chelating resins containing Iminodiacetic acid groups (-LH2) were studied. Adsorption curves, measured under the conditions of metal ions in excess against chelating groups, directly indicated the metal-to-ligand ratio of the complexes formed in the resin phase, Iron and group 13 metal ions were adsorbed as (-L)(2)HM, while group 3 metal ions were adsorbed as (-L)(3)H3M and (-L)(2)HM, The adsorption constants for (-L)(2)HM found for all the metal ions were well correlated with the formation constants of iminodiacetate complexes in aqueous solutions, The actual adsorption of group 3 metal ions was significantly enhanced beyond that expected from this correlation because of the formation of (-L)(3)H3M This is why the selectivity in the adsorption of trivalent metal ions differs from that in the complexation of iminodiacetate in aqueous solutions, The effects of anions and the number of iminodiacetic acid groups. per unit weight of resins were also discussed.