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

摘要

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.The breakthrough curves have an S-shape for the total as well as for the single metal ions in binary 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=15 times higher than the quantity of zinc,which means that mostly lead ions were bound on the zeolite.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.