Priority pollutants (Hg2+ and Cd2+) removal from water by ETS-4 titanosilicate
authors Otero, M; Lopes, CB; Coimbra, J; Ferreira, TR; Silva, CM; Lin, Z; Rocha, J; Pereira, E; Duarte, AC
nationality International
journal DESALINATION
author keywords Mercury; Cadmium; Titanosilicate; Sorption; Purification
keywords HEAVY-METALS UPTAKE; AQUEOUS-SOLUTION; ACTIVATED CARBONS; IONS REMOVAL; WASTE-WATER; COPPER IONS; ADSORPTION; MERCURY(II); SORPTION; CADMIUM
abstract The synthetic microporous titanosilicate material ETS-4 has been used for the removal of Hg2+ and Cd2+ from water. Batch stirred experiments were carried out to study the equilibrium and the kinetics of the removal of Hg2+ and Cd2+ from water. It has been demonstrated that ETS-4 has a great affinity for both these metal cations even when their initial concentrations are low. The uptake rates for both Hg2+ and Cd2+ were well described by the pseudo-second order model which constants confirmed that the kinetics of the removal of Cd2+ is faster than that of Hg2+. However, at the equilibrium, ETS-4 has a higher capacity to remove Hg2+ than Cd2+. Adsorption isotherms for both Hg2+ and Cd2+ were well fitted to Langmuir isotherm and the corresponding monolayer capacities of ETS-4 are 0.43 and 0.24 mu mol mg(-1), respectively, which are quite consistent with those predicted by the pseudo-second order kinetic equation. Hence, the contribution of this work is to support the use of this material for the removal of Hg2+ and Cd2+ from water. (C) 2009 Elsevier B.V. All rights reserved.
publisher ELSEVIER SCIENCE BV
issn 0011-9164
year published 2009
volume 249
issue 2
beginning page 742
ending page 747
digital object identifier (doi) 10.1016/j.desal.2009.04.008
web of science category Engineering, Chemical; Water Resources
subject category Engineering; Water Resources
unique article identifier WOS:000272015800046
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journal impact factor 7.098
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