ADSORPTIVE REMOVAL OF FIVE HEAVY METALS FROM WATER USING BLAST FURNACE SLAG AND FLY ASH

Authors

  • Nguyen Thuy Chung School of Environmental Science and Technology, Hanoi University of Science and Technology, 1 Dai Co Viet Road, Hanoi, Viet Nam

DOI:

https://doi.org/10.15625/2525-2518/54/2A/11947

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 6.5 for fly ash ranged 3.4 - 5.1 mg/g with the adsorption capacity for the metals in the order, Pb > Cu > Cd, Zn, Cr. The corresponding values for furnace slag were 4.3 - 5.2 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.

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Published

2018-03-19

Issue

Section

Articles