Adsorption behavior of Pb(II) in aqueous solution using coffee husk-based activated carbon modified by nitric acid

Activated carbon (AC) was prepared from coffee husk and modified by nitric acid for effective lead ions removal from aqueous solution. The as-prepared samples have uniform particles size, developed surface area and contain acidic surface functional groups. Nitric acid modification showed a pronounced effect on improving Pb(II) adsorption capacity. The Freundlich isotherm model and pseudo second-order kinetic model could best describe the adsorption of Pb(II) onto AC-Nitric. Thermodynamics parameters proved the spontaneous, physic and endothermic nature of the adsorption of Pb(II) onto AC-Nitric. | American Journal of Engineering Research AJER 2016 American Journal of Engineering Research AJER e-ISSN 2320-0847 p-ISSN 2320-0936 Volume-5 Issue-4 pp-120-129 Research Paper Open Access Adsorption behavior of Pb II in aqueous solution using coffee husk-based activated carbon modified by nitric acid Thu Thuy Luong Thi Khu Le Van Faculty of Chemistry Hanoi National University of Education 136 Xuan Thuy Street Cau Giay District Hanoi Vietnam ABSTRACT Activated carbon AC was prepared from coffee husk and modified by nitric acid for effective lead ions removal from aqueous solution. The as-prepared samples have uniform particles size developed surface area and contain acidic surface functional groups. Nitric acid modification showed a pronounced effect on improving Pb II adsorption capacity. The Freundlich isotherm model and pseudo second-order kinetic model could best describe the adsorption of Pb II onto AC-Nitric. Thermodynamics parameters proved the spontaneous physic and endothermic nature of the adsorption of Pb II onto AC-Nitric. Keywords -Activated carbon Adsorption Coffee Husk Lead Ions I. INTRODUCTION The pollution of heavy metals especially lead ions gave serious impact on the health of humans and other living organisms even at low concentrations 1 . The main sources of human exposure to lead are including metallurgy metal plating mining industrial tanning acid battery manufacturing. 2 . Although numerous techniques for the removal of metal ions have been established like chemical precipitation electrochemical precipitation evaporation ion exchange membrane separation . 3 sorption is consider an effective method with the advantage of low cost high removal efficiency economical feasibility and ease of processing. However the main drawback of this method is that the commercially adsorbent is considerate expensive lead to the high cost of wastewater treatment. To overcome this problem naturally abundant resources or agricultural by-products such as

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