Abstract
The breakthrough behavior of Pb 2+ in an ETS-10 fixed bed was experimentally examined at various operating conditions. Results showed that the adsorption amount of Pb 2+ ions per unit mass of ETS-10 particles in a column is about 1.68 mmol/g under the experimental conditions. This amount was not markedly affected by the operating conditions because of the rapid adsorption rate of Pb 2+ ions on ETS-10. In the presence of competitive metal ions, the amount of Pb 2+ adsorbed on ETS-10 was slightly reduced. An overshoot of the effluent concentrations of competitive metal ions Cu 2+ and Cd 2+ was observed in the adsorption systems of binary and ternary solutions. This is ascribed to the replacement of pre-adsorbed Cu 2+ and Cd 2+ ions by Pb 2+ ions. The ETS-10 column broken up by Pb 2+ ions can be regenerated by using an EDTA-Na 2 solution and the regenerated column can be reused.
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