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Measurement of Adsorption on Solids by the Axial Filter; Linear Vs. Nonlinear Isotherms¹

ABSTRACT

Use of the axial filter for adsorption measurements and evaluation of distribution coefficient is described. Adsorption of Sr(II), Co(II), and Cd(II) on Na montmorillonite from solutions of a wide range of NaCl concentration was measured by the axial filter and compared with results obtained by other experimental methods. Agreement was found for Sr(II) and Cd(II) systems. Disagreements between batch and axial filters results for Co(II) adsorption appear to rise mainly from the slow kinetics of the Co(II) adsorption.

Adsorption of Sr(II) on alumina was used to demonstrate the application of the axial filter method for a nonlinear isotherm case. The nonlinear isotherm, obtained by a batch method, was used to explain the behavior of the system in an axial filter experiment. Good agreement was obtained between the predicted and the experimental axial filter results.

¹ Research sponsored by the Division of Chemical Sciences, Office of Basic Energy Sciences, U. S. Dep. of Energy, under contract W 7405-eng-26 with Union Carbide Corporation.

² Visiting Scientist, Chemistry Division, Oak Ridge National Laboratory, Oak Ridge, TN 37830. On leave from Research and Development Authority, Ben Gurion University, Beer Sheva, Israel.

Received for publication August 16, 1979. Accepted for publication January 31, 1980.