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Received March 5, 2001
Accepted July 16, 2001
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Ion separation of binary metallic aqueous solutions at acidic Langmuir monolayer surfaces
Nano & Interfacial Engineering Laboratory, Department of Chemical Engieering, Korea University, Seoul 136-701, Korea
Korean Journal of Chemical Engineering, November 2001, 18(6), 977-985(9), 10.1007/BF02705629
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Abstract
We focused on analyzing the capability of the acidic monolayer surfaces for separation of toxic metal ions out of house-prepared binary inorganic ionic solutions such as calcium-lead, calcium-chromium, calcium-copper, and calcium-zinc aqueous systems. The affinities of the films to toxic metal ions were analyzed by using Fourier transform infrared spectroscopy. A model considering both the electrochemical and thermodynamic aspects was also applied to quantify the surface ion affinities. It is noted that surface ion binding capability for binary ionic solutions can be much different from that for pure ionic solutions. As a result, surface binding constants were found to be 4.5 x 10(6), (++) for lead ions, 1.5 x 10(6) for chromium ions, 5.5 x 10(5) for copper ions, and 6 x 10(4) for zinc ions, respectively, at pH=5.5. For the separation experiments done at pH=5.5, lead, copper, zinc ions were separated more efficiently from the mixed ionic solutions by the factors of ca. 30,000, 10,000, 3,700, and 400, respectively, compared to calcium ions of which binding constant is 1.5 x 10(2). Interestingly, when compared to corresponding pure ionic systems, copper and lead ions were separated as much, while chromium and zinc ions were less by the factor of 500 and 50, respectively.
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Ahn DJ, Franses EI, AIChE J., 40(6), 1046 (1994)
Ahn DJ, Franses EI, J. Phys. Chem., 96, 9952 (1992)
Bloch JM, Yun WB, Phys. Rev., A, 41, 844 (1990)
Bloch JM, Yun WB, Yang X, Ramanathan M, Montano PA, Capasso C, Phys. Rev. Lett., 61, 2941 (1988)
Choi JW, Nam YS, Oh BK, Ahn DJ, Lee WH, Mol. Cryst. Liq. Cryst., 349, 291 (2000)
Colthup NB, Daly LH, Wiberley SE, "Introduction to Infrared and Raman Spectroscopy," 3rd ed., Academic Press, New York (1990)
Hyun JY, Lee GS, Kim TY, Ahn DJ, Korean J. Chem. Eng., 14(6), 533 (1997)
Kim D, Korean J. Chem. Eng., 17(5), 600 (2000)
Kimura F, Umemura J, Takenaka T, Langmuir, 2, 96 (1986)
Kurata M, "Thermodynamic of Polymer Solution," New York, Harwood Academic Publishers (1982)
Kim SR, Choi SA, Kim JD, Korean J. Chem. Eng., 13(1), 46 (1996)
Losche M, Helm C, Matters HD, Mohwald H, Thin Solid Films, 133, 51 (1985)
Marshbanks TL, Ahn DJ, Franses EI, Langmuir, 10(1), 276 (1994)
Matsubara A, Matuura R, Kimizuka H, Bull. Chem. Soc. Jpn., 38, 369 (1965)
Mumby SJ, Swalen JD, Macromolecules, 19, 1054 (1986)
Petrov JA, Kuleff I, Platikanov D, J. Colloid Interface Sci., 88, 29 (1982)
Pezron E, Claesson PM, Berg JM, Vollgardt D, J. Colloid Interface Sci., 138, 245 (1990)
Rabolt JF, Burns FC, Schlotter NE, Swalen JD, J. Chem. Phys., 78, 946 (1983)
Shrauner A, J. Math. Bio., 2, 333 (1975)
Shin S, Wang ZG, Rice SA, J. Chem. Phys., 92, 1427 (1990)
Vijendra KA, Phys. Today, June, 40 (1988)
Vogel V, Christof W, J. Chem. Phys., 84, 5200 (1986)
Whitesides GM, Mathias JP, Seto CT, Science, 254, 1312 (1991)
Yamauchi A, Matsubara A, Kimzuka H, Abood LG, Biochim. Biophys. Acta, 150, 181 (1968)
