Coleman, N. J., Brassington, D. S., Raza, A. and Lee, W. E. (2006) Calcium silicate sorbent from secondary waste ash: Heavy metals-removal from acidic solutions. Environmental Technology, 27 (10). pp. 1089-1099. ISSN 0959-3330 (Print), 1479-487X (Online) (doi:10.1080/09593332708618724)

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Abstract

The layer lattice, ion-exchange material, Al-substituted 11 angstrom tobermorite, has been synthesised via an alkaline hydrothermal route from a secondary waste ash arising from newsprint recycling. The hydrogarnet, katoite (Ca3Al2SiO12H8), was also formed. Batch sorption analyses have confirmed that the Al-substituted 11 angstrom tobermorite-bearing product is an effective sorbent for Co2-, Cd2- and Zn2- ions from acidified aqueous media. Kinetic sorption data were analysed in accordance with the pseudo-first- and pseudo-second-order models and steady state data were fitted to the Langmuir and Freundlich isotherms. The Langmuir and pseudo-second-order models provided the most appropriate descriptions of the sorption processes. The maximum uptake capacities for Co2+, Cd2+ and Zn2+ at 20 degrees C were found to be 10.47, 2.92 and 3.09 mg g(-1), respectively, and the respective apparent pseudo-second-order rate constants were estimated to be 5.08 x 10(-3), 1.10 x 10(-3) and 1.13 x 10(-3) g mg(-1) min(-1).

Item Type:	Article
Uncontrolled Keywords:	Tobermorite, Pseudo-second-order model, Langmuir isotherm, adsorption, Kinetics, Steady state
Faculty / School / Research Centre / Research Group:	Faculty of Engineering & Science
Last Modified:	14 Oct 2016 09:28
URI:	http://gala.gre.ac.uk/id/eprint/11798

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