Coleman, Nichola J., Li, Qiu and Raza, Atiya (2014) Synthesis, structure and performance of calcium silicate ion exchangers from recycled container glass. Physicochemical Problems of Mineral Processing, 50 (1). pp. 5-16. ISSN 1643-1049 (Print), 2084-4735 (Online) (doi:https://doi.org/10.5277/ppmp140101)

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Abstract

Numerous technical, economic and societal factors limit the recycling of waste soda-lime-silica glass back into the primary production process and accordingly alternative applications for this material are sought. This study demonstrates that waste soda-lime-silica container glass is a suitable feedstock material for the production of tobermorite, a calcium silicate cation exchanger. Tobermorites were synthesised at 100 degrees C from stoichiometric mixtures of container glass and lime under alkaline hydrothermal conditions. Increasing concentrations of sodium hydroxide (between 1.0 M and 4.0 M) in the reaction mixture promoted the formation and crystallisation of tobermorite, and also resulted in greater fragmentation of the silicate chains along the b-axis direction. The maximum removal capacities of these tobermorite specimens for Cd2+ (441 mg g(-1)) and Zn2+ (122 mg g(-1)) compared well with those of other waste-derived sorbents. Superior Cd2+- and Zn2+- uptake capacities and kinetics were observed for the least crystalline tobermorite specimen, indicating that stacking defects facilitate the transport and exchange of cations within the lattice.

Item Type:	Article
Uncontrolled Keywords:	tobermorite, sorbent, hydrothermal synthesis, cullet, recycling, ion-exchange
Subjects:	T Technology > T Technology (General) T Technology > TN Mining engineering. Metallurgy
Faculty / School / Research Centre / Research Group:	Faculty of Engineering & Science > School of Science (SCI)
Related URLs:	Publisher
Last Modified:	17 Oct 2016 09:12
URI:	http://gala.gre.ac.uk/id/eprint/11815

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