SORPTION OF LEAD CATIONS (II) BY ACID-MODIFICATED ZEOLITE IN ALKALINE MEDIUM

Abstract

A systematic analysis of the sorption properties of acid-modified zeolite was carried out in alkaline (pH 8.5) medium with respect to Pb2+ cations. The interaction of time, temperature and concentration of lead on the sorption capacity of acid-modified zeolite was established. The sorption curves depending on temperature and concentration of Pb2+ ions have extreme character. The appearance of the maximum or minimum on the lead sorption curves probably due to saturation of modified zeolite with lead cations under these conditions, consequence, a decrease in its sorption properties. This process, in turn, is caused by the desire of the system to equilibrium, where the concentration of lead is equalized in both phases. The optimal conditions for sorption of Pb (II) cations in an alkaline medium with an acid-modified zeolite corresponding to the maximum degree of their absorption (99.8-99.9%) were determined.

References

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