en Efficiency of Chitosan for the Removal of Pb (II), Fe (II) and Cu (II) Ions from Aqueous Solutions عمومى General پژوهشي Research <b>Background:</b> Heavy metals have been recognized as harmful environmental pollutant known to produce highly toxic effects on different organs and systems of both humans and animals. The aim of this paper is to evaluate the adsorption potential of chitosan for the removal of Pb(II), Fe(II) and Cu(II) ions from aqueous solutions. <br><b>Methods: </b>This study was conducted in laboratory scale. In this paper chitosan has been used as an adsorbent for the removal of Pb(II), Fe(II) and Cu(II) from aqueous solution. In batch tests, the effects of parameters like pH solution (1.0-8.0), initial metal concentrations (100-1000 mgL-1), contact time (5.0-150 min) and adsorbent dose (1.0-7.0 g) on the adsorption process were studied. <br><b>Results:</b> The results showed that the adsorption of Pb(II), Fe(II) and Cu(II) ions on chitosan strongly depends on pH. The experimental isothermal data were analyzed using the Langmuir and Freundlich equations and it was found that the removal process followed the Langmuir isotherm and maximum adsorption capacity for the adsorption of Pb(II), Fe(II) and Cu(II) ions by the chitosan were 55.5mg g−1, 71.4 mg g−1 and 59 mg g−1, respectively, under equilibrium conditions at 25±1 ºC. The adsorption process was found to be well described by the pseudo-second-order rate model. <br><b>Conclusion:</b> The obtained results showed that chitosan is a readily, available, economic adsorbent and was found suitable for removing Pb(II), Fe(II) and Cu(II) ions from aqueous solution. Adsorption, Chemical Water Pollution, Chitosan, Heavy Metals, Removal Efficiency. Adsorption, Chemical Water Pollution, Chitosan, Heavy Metals, Removal Efficiency. 1145 1151 http://ijt.arakmu.ac.ir/browse.php?a_code=A-10-2-167&slc_lang=en&sid=1 Soheil Sobhanardakani سهیل سبحان اردکانی s_sobhan@iauh.ac.ir 10031947532846003675 10031947532846003675 Yes . Department of the Environment, College of Basic Sciences, Hamedan Branch, Islamic Azad University, Hamedan, Iran. . Department of the Environment, College of Basic Sciences, Hamedan Branch, Islamic Azad University, Hamedan, Iran. Raziyeh Zandipak رضیه زندی پاک 10031947532846003676 10031947532846003676 No MSc Environment, Young Researchers & Elite Club, Hamedan Branch, Islamic Azad University, Hamedan, Iran. MSc Environment, Young Researchers & Elite Club, Hamedan Branch, Islamic Azad University, Hamedan, Iran. Hassan Parvizimosaed حسن پرویزی مساعد 10031947532846003677 10031947532846003677 No Young Researchers & Elite Club, Hamedan Branch, Islamic Azad University, Hamedan, Iran. Young Researchers & Elite Club, Hamedan Branch, Islamic Azad University, Hamedan, Iran. Arash Javanshir Khoei آرش جوانشیرخویی 10031947532846003678 10031947532846003678 No Department of Fisheries, College of Agriculture & Natural Resources, University of Tehran, Karaj, Iran. Department of Fisheries, College of Agriculture & Natural Resources, University of Tehran, Karaj, Iran. Mehran Moslemi مهران مسلمی 10031947532846003679 10031947532846003679 No Department of Fisheries, Jouybar Branch, Islamic Azad University, Jouybar, Iran. Department of Fisheries, Jouybar Branch, Islamic Azad University, Jouybar, Iran. Mahsa Tahergorabi مهسا طاهرگورابی 10031947532846003680 10031947532846003680 No Department of Public Health, Kerman University of Medical Sciences, Kerman, Iran. Department of Public Health, Kerman University of Medical Sciences, Kerman, Iran. Seyed Mehdi Hosseini سیدمهدی حسینی 10031947532846003681 10031947532846003681 No Department of the Environment, Tarbiat Modares University, Noor, Iran. Department of the Environment, Tarbiat Modares University, Noor, Iran. Parisa Delfieh پریسا دلفیه 10031947532846003682 10031947532846003682 No Department of Fisheries, Khoramshar University of Marine Science and Technology, Khoramshar, Iran. Department of Fisheries, Khoramshar University of Marine Science and Technology, Khoramshar, Iran.