Biosorption of lead from milk by naoh_treated orange peel Naghizade, S. 1, Esmaili, A. 2

Adsorption of Pb²⁺ from contaminated milk by NaOH treated orange peel due to lead contamination of pasturage, adosorption of Pb²⁺ from contaminated cow milk was investigated by innocuous NaOH treated orange peel. At first. Adsorption of Pb²⁺ was studied in aqueous solution contaminating 50ppm of Pb²⁺. Effect of adsorbent dose was considered in three different doses (1,2,4 g/l) temperature and particle size had no effect on Pb²⁺ biosorption. When pH has increased from 2 to 5.5 Pb²⁺ adosorption has augmented too. Continuing this work, model solution with composition similar to milk was prepared. In this study, the effect of several parameters on adosorption of Pb²⁺ fram milk model solution was measured by atomic absorption. Effect of adsorbent dose was considered in three different doses (5, 10,15,g/l). The data are better had no effect on the biosorption capacity of NaOH treated orange peel. Also results show that the ion–excheng mechanism is prevailing in the adsorption of Pb²⁺from milk model solution.