Abstract
Langmuir monolayers containing surface carboxylic acid head groups were examined in order to characterize their selectivity to metal ion adsorption. Experimental data of ion adsorption obtained by surface isotherms and FTIR spectroscopy were analyzed using a thermodynamic-and-electrochemical model. Among bivalent ions examined (Cr2+, Pb2+, Cu2+, Cd2+, Zn2+, Ca2+, Ni2+, and Ba2+), Langmuir monolayers showed the highest selectivity to chromium ions. In addition, it was found that adsorption constants of the surface ions are quite different from binding constants of the bulk ions. The results show important implications to sensing and separating metal ions by the use of acidic supramolecular materials.
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Hyun, J.Y., Lee, G.S., Kim, T.Y. et al. Selectivity of heavy metal ions at acidic supramolecular surfaces. Korean J. Chem. Eng. 14, 533–540 (1997). https://doi.org/10.1007/BF02706606
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DOI: https://doi.org/10.1007/BF02706606