engleski

Competitive removal of Lead(II) and Zinc(II) from a binary aqueous solution on a fixed bed of natural zeolite

The column method using a fixed bed of zeolite clinoptilolite was applied to remove lead and zinc ions from binary metal ions solutions. The raw zeolite sample used in this study was obtained from the Vranjska Banja deposit (Serbia) and contained more than 80% of clinoptilolite. Experiments were carried out with a binary aqueous solution of lead and copper ions of total concentration 1.145 mmol/l (Pb=0.557 mmol/l and Zn=0.588 mmol/l respectively) in a glass column filled with 2.9 g of the zeolite sample to the bed depth of 40 mm. The breakthrough curves of the service cycle have an S-shape for the total and for the single ion solution. Lead and zinc ions bind simultaneously on the zeolite bed, and as the service cycle progresses lead ions displace a great portion of bound zinc. During the regeneration cycle, the quantity of lead desorbed is 20 times higher than the quantity of zinc, which means that mostly lead ions were bound on the zeolite. This is due to a higher affinity of zeolite for lead ions and their antagonistic behaviour towards zinc ions. Breakthrough curves have been interpreted quantitatively by means of the Michaels method, and the results calculated have been compared with the results for single metal ions solutions.

Zeolite; Lead; Zinc; Column method; Binary solution

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