Title: 11 Å tobermorite ion exchanger from recycled container glass
Author: Nichola J. Coleman
Address: School of Science, University of Greenwich, Chatham Maritime, Kent, ME4 4TB, UK
Journal: Int. J. of Environment and Waste Management, 2011 Vol.8, No.3/4, pp.366 - 382
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.
Keywords: sorbents; hydrothermal synthesis; glass cullet; recycling; ion exchange; calcium silicate; pseudo-second-order kinetic modelling; recycled container glass; feedstock material; hydrothermal synthesis; tobermorite; batch sorption.