Synthesis, structure and performance of calcium silicate ion exchangers from recycled container glass

• Autorzy: Coleman N. J. , Li Q. , Raza A.

Identyfikatory

DOI

10.5277/ppmp140101

• Języki publikacji: EN

Abstrakty

EN

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.

Słowa kluczowe

EN

tobermorite; sorbent; hydrothermal synthesis; cullet; recycling; ion exchange

• Wydawca: Oficyna Wydawnicza Politechniki Wrocławskiej
• Czasopismo: Physicochemical Problems of Mineral Processing
• Rocznik: 2014
• Tom: Vol. 50, iss. 1
• Strony: 5--16
• Opis fizyczny: Bibliogr. 28 poz., rys.

Twórcy

autor

Coleman N. J.

• School of Science, University of Greenwich, Chatham Maritime, Kent, ME4 4TB, UK

autor

Li Q.

• School of Civil Engineering, University of Leeds, Leeds, LS2 9JT, UK.

autor

Raza A.

• School of Science, University of Greenwich, Chatham Maritime, Kent, ME4 4TB, UK.

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