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Sorption of Co2+ and Sr2+ by waste-derived 11 A tobermorite

Sorption of Co2+ and Sr2+ by waste-derived 11 A tobermorite

Coleman, Nichola, Brassington, D., Raza, Atiya and Mendham, Andrew (2006) Sorption of Co2+ and Sr2+ by waste-derived 11 A tobermorite. Waste Management, 26 (3). pp. 260-267. ISSN 0956-053X (doi:

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Newsprint recycling gives rise to significant volumes of waste sludge which can be de-watered and combusted for energy-recovery. The residual combustion ash, whose primary crystalline constituents are; gehlenite (Ca2Al2SiO7) (a) over circle kermanite (Ca2MgSi2O7) beta- dicalcium silicate (Ca2SiO4) and anorthite (CaAl2Si2O8), is currently consigned to landfill disposal. It is demonstrated herein that a mixed product of Al-substituted 11 angstrom tobermorite (Ca5Si6O18H2 center dot 4H(2)O) and katoite (Ca3Al2SiO12H8)) can be synthesised from newsprint recycling combustion ash via a hydrothermal route. Batch sorption studies confirm that this mixed product is an effective sorbent for the exclusion of Co2+ and Sr2+ from acidic aqueous media. Kinetic sorption data are analysed in accordance with the pseudo-first- and pseudo-second-order models, and steady-state data is fitted to the Langmuir and Freundlich isotherms. The Langmuir and pseudo- second-order models are found to provide the most appropriate descriptions of the sorption processes. The 2+ 2+ 1 maximum uptake capacities for Co2+ and Sr2+ at 20 degrees C are 10.47 and 1.52 mg g(-1), respectively, and the respective apparent pseudo-second-order rate constants are estimated to be 5.08 x 10(-3) and 6.96 x 10(-3) g mg(-1) min(-1). (c) 2005 Published by Elsevier Ltd.

Item Type: Article
Uncontrolled Keywords: Tobermorite
Faculty / School / Research Centre / Research Group: Faculty of Engineering & Science
Last Modified: 14 Oct 2016 09:28

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