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Interactions of Cd(II) with waste-derived 11 Å tobermorites

Interactions of Cd(II) with waste-derived 11 Å tobermorites

Coleman, Nichola J. (2005) Interactions of Cd(II) with waste-derived 11 Å tobermorites. Separation and Purification Technology, 48 (1). pp. 62-70. ISSN 1383-5866 (doi:

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Paper recycling gives rise to significant volumes of secondary waste materials which undermine its economic and environmental sustainability. In response to this problem, a waste combustion ash arising from newsprint recycling has been evaluated as a feedstock material for the hydrothermal synthesis of Al-substituted 11 angstrom tobermorites. Highly crystalline tobermorite (NRR-H2O) was obtained from a stoichiometrically optimised mixture of newsprint recycling residue, sodium silicate and calcium oxide, whereas a less well-ordered product (NRR-NaOH) was acquired when sodium hydroxide was also incorporated into the reagent mixture. Structural disorder within the tobermorite lattice was found to accelerate the kinetics of Cd2+ for Ca2+ ion exchange although had little impact on the total number of available exchange sites per unit formula. The Langmuir isotherm model provided a suitable description for the steady state uptake of Cd2+ by both tobermorite specimens under single metal ion batch sorption conditions, from which, maximum adsorption capacities of 167 and 179 mg g(-1) were obtained for NRR-NaOH and NRR-H2O, respectively. (C) 2005 Elsevier B.V. All rights reserved.

Item Type: Article
Uncontrolled Keywords: calcium silicate hydrate, Langmuir isotherm, ion exchange, hydrothermal synthesis, recycling
Subjects: Q Science > QD Chemistry
T Technology > TA Engineering (General). Civil engineering (General)
Faculty / School / Research Centre / Research Group: Faculty of Engineering & Science
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Last Modified: 14 Oct 2016 09:28

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