Synthesis, structure and performance of calcium silicate ion exchangers from recycled container glass
Qui Li 2
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School of Science, University of Greenwich, UK
School of Civil Engineering, University of Leeds, Leeds, LS2 9JT, UK.
Publication date: 2014-01-01
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Nichola J. Coleman   

University of Greenwich, Chatham Maritime, Kent, ME4 4TB, UK
Physicochem. Probl. Miner. Process. 2014;50(1):5-16
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°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.
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