TAILIEUCHUNG - Adsorptive removal of five heavy metals from water using blast furnace slag and fly ash
Heavy metals can be serious pollutants of natural water bodies causing health risks to humans and aquatic organisms. A study was conducted to remove five heavy metals from water by adsorption onto an iron blast furnace slag and a fly ash in batch experiments. Increase of pH increased adsorption of all metals. | Journal of Science and Technology 54 (2A) (2016) 314-320 ADSORPTIVE REMOVAL OF FIVE HEAVY METALS FROM WATER USING BLAST FURNACE SLAG AND FLY ASH Nguyen Thuy Chung1, *, To Thi Duc Hanh2, Tien Vinh Nguyen3 1 2 School of Environmental Science and Technology, Hanoi University of Science and Technology, 1 Dai Co Viet Road, Hanoi, Viet Nam Faculty of Biology and Environmental Science, Phuong Dong University, 171 Trung Kinh, Yen Hoa, Cau Giay District, Hanoi, Viet Nam 3 Faculty of Engineering and IT, University of Technology Sydney, 15 Broadway Ultimo NSW 2007 *Email: Received: 1 May 2016; Accepted for Publication: 20 June 2016 ABSTRACT Heavy metals can be serious pollutants of natural water bodies causing health risks to humans and aquatic organisms. A study was conducted to remove five heavy metals from water by adsorption onto an iron blast furnace slag and a fly ash in batch experiments. Increase of pH increased adsorption of all metals. Equilibrium adsorption of all metals was successfully modelled using Langmuir, Freundlich and Dubinin-Radushkevich models, with Freundlich model fitting the data the best. Langmuir adsorption maximum at pH for fly ash ranged mg/g with the adsorption capacity for the metals in the order, Pb > Cu > Cd, Zn, Cr. The corresponding values for furnace slag were - mg/g, and the order of adsorption capacities, Pb, Cu, Cd > Cr > Zn. The kinetics of adsorption fitted well to both the pseudo-first order and pseudo-second order models, but the fit was slightly better for the pseudo-second order model. 1. INTRODUCTION Elevated concentrations of heavy metals in the environment can cause health risk to humans and aquatic organisms and therefore they should be removed from water. Various processes for the removal of heavy metals are available, of these, adsorption method is generally considered to be attractive because of its effectiveness, simplicity of operation, and environmental .
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