University Of Tehran Press Pollution 2383-451X 5 1 2019 01 01 Adsorption and Leaching Behavior of Copper, Zinc and Lead Ions by Three Different River Nile Sediments at Aswan, Egypt 99 114 68936 10.22059/poll.2018.259199.450 EN M.N. Rashed Chemistry Department, Faculty of Science, Aswan University, 81528 Aswan, Egypt M. E. F. Toufeek National Institute of Oceanography and Fisheries (NIOF), Aswan, Egypt M. A. E. Eltaher Chemistry Department, Faculty of Science, Aswan University, 81528 Aswan, Egypt A.O. Elbadry National Institute of Oceanography and Fisheries (NIOF), Aswan, Egypt Journal Article 2018 05 15 The present study was carried out to investigate the adsorption and leaching behavior of Cu²⁺, Zn²⁺ and Pb²⁺ by sediments collected from the western banks of three different sectors along River Nile at Aswan governorate, Egypt. The feasibility of sediments for the removal of Cu²⁺, Zn²⁺ and Pb²⁺ from aqueous solutions was tested under the effect of three conditions (pH, initial metal concentration and contact time). By increasing pH, the adsorption of Cu²⁺ and Pb²⁺ by sediments decreased while that of Zn²⁺ increased. The optimum pH values for Cu²⁺, Zn²⁺ and Pb²⁺ removal were determined as 5, 8.5 and 5, respectively. The adsorption capacities of sediments for metal ions were in the order of Pb²⁺> Cu²⁺> Zn²⁺. The maximum uptake for Cu²⁺, Zn²⁺ and Pb²⁺ by sediments occurred at contact times of 48 h, 24 h and 72 h, respectively. Adsorption data were fitted well by Freundlich, Dubinin–Radushkevich and Temkin isotherms. The experimental results obtained were analyzed using two adsorption kinetic models, pseudo-first-order and pseudo-second-order, in which pseudo-second-order equation described the data more than pseudo-first-order one. The average leaching percentages of Cu²⁺, Zn²⁺ and Pb²⁺ from sediments were 0.77%, 2.72% and 0.38%, respectively, with respect to pH, 0.83%, 2.49% and 0.38%, respectively , with respect to temperature, and also 0.79%, 2.34% and 0.38%, respectively with respect to contact time. The leaching percentages of metal ions from sediments were in the order of Zn²⁺> Cu²⁺> Pb²⁺. https://jpoll.ut.ac.ir/article_68936_da02c7611125310e4023aef0241f000d.pdf