<報文>Na型およびH型ゼオライトに対するCo, CrおよびFeの分配

概要

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The effect of pH on the distribution has been studied by the use of radioisotopes, ^<60>Co, ^<51>Cr and ^<59>Fe, with Na- and H-type zeolites, i.e., synthetic zeolites A, X and Y, synthetic mordenite, natural mordenite, and clinoptilolite. At tracer-level concentrations, distribution coefficients (K) into Na-type zeolites indicated curves with a maximum at a different equilibrium pH corresponding to the kind of zeolites. Lowering of K values in the acidic region is due to the selective adsorption of hydrogen ions. In the presence of carrier (10 ppm), the distribution coefficients into the zeolites showed similar curves with a maximum at the pH of about 7 and 6.2 for Co and Cr, respectively. The values of K were 10^4 or above for zeolite Y with the largest channel. For H-type zeolites, the values of K were less than 10^2 at pH 3 and decreased with increasing acidity.
東北大学の論文
1978-09-16