11 Å tobermorite ion exchanger from recycled container glass
by Nichola J. Coleman
International Journal of Environment and Waste Management (IJEWM), Vol. 8, No. 3/4, 2011

Abstract: Waste container glass cullet has been evaluated as a feedstock material for the hydrothermal synthesis of tobermorite, a cation exchanger. Accordingly, it is demonstrated that essentially phase-pure 11 Å tobermorite, Ca₅Si₆O₁₆ (OH) ₂ · 4H₂O, can be obtained from a stoicheiometrically-adjusted mixture of waste glass cullet and calcium oxide in aqueous sodium hydroxide at 100ºC. A batch sorption study indicated that the cullet-derived tobermorite is highly effective in the removal of Pb²⁺ (1.66 mmol g^-1) and Cd²⁺ (0.48 mmol g^-1) from solution. Its ion exchange characteristics are compared with those of other waste-derived sorbents and potential applications are discussed.

Online publication date: Sat, 24-Jan-2015

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