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Retention characteristics of Cu2+, Pb2+, and Zn2+ from aqueous solutions by two types of low lime fly ashes

Moghal, Arif Ali Baig and Sivapullaiah, Puvvadi V (2012) Retention characteristics of Cu2+, Pb2+, and Zn2+ from aqueous solutions by two types of low lime fly ashes. In: TOXICOLOGICAL AND ENVIRONMENTAL CHEMISTRY, 94 (10). pp. 1941-1953.

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Official URL: http://dx.doi.org/10.1080/02772248.2012.732579


The technical feasibility of utilization of fly ash as a low-cost adsorbent for the removal of metals from water has been studied. For two types of fly ashes, the retention capacities of copper, lead, and zinc metal ions have been studied. Contact time, initial concentration, and pH have been varied and their effect on retention mechanism has been studied. The dominant mechanisms responsible for retention are found to be precipitation due to the presence of calcium hydroxide, and adsorption due to the presence of silica and alumina oxide surfaces in the fly ash. First-order kinetic plots have revealed that the rate constant increases with increase in the initial concentration and pH. Langmuir adsorption isotherms have been plotted to study the maximum adsorption capacities for metal ions considered under different conditions. X-ray diffraction studies revealed the formation of new peaks corresponding to respective metal ions precipitates under alkaline conditions.

Item Type: Journal Article
Additional Information: Copyright for this article belongs to TAYLOR & FRANCIS LTD, ENGLAND
Keywords: adsorption;equilibrium concentration;isotherm;
Department/Centre: Division of Mechanical Sciences > Civil Engineering
Depositing User: Francis Jayakanth
Date Deposited: 31 Dec 2012 08:26
Last Modified: 31 Dec 2012 08:26
URI: http://eprints.iisc.ac.in/id/eprint/45610

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