Removal of Hg2+ ions from aqueous solution by ETS-4 microporous titanosilicate-Kinetic and equilibrium studies
authors Lopes, CB; Otero, M; Lin, Z; Silva, CM; Rocha, J; Pereira, E; Duarte, AC
nationality International
journal CHEMICAL ENGINEERING JOURNAL
author keywords Mercury; Titanosilicates; ETS-4; Sorption; Kinetics; Equilibrium
keywords ACTIVATED CARBONS; MERCURY IONS; METAL-IONS; HG(II) IONS; ADSORPTION; BIOSORPTION; SORPTION; WATER; CADMIUM(II); ISOTHERMS
abstract Batch stirred tank experiments were carried out to study the application of ETS-4 microporous titanosilicate for Hg2+ ions removal from aqueous solution. The effect of operational conditions was assessed and it was proved that Hg2+ uptake (%) increases with increasing contact time, increasing ETS-4 mass and decreasing initial Hg2+ concentration. It was confirmed that stirring rate does not affect the Hg2+ removal by ETS-4 as long as it is high enough to break the diffusion resistance. Two simplified models, the pseudo first-order and the pseudo second-order equations, were used to describe the kinetics of the sorption process and better fittings were obtained by the last one. The Bt versus t plots indicated that film diffusion is the rate-limiting step of the removal of Hg2+ by ETS-4. Langmuir, Freundlich and Dubinin-Radushkevich isotherm equations fitted quite well the equilibrium data and the Langmuir maximum capacity of ETS-4 was found to be 246 mg g(-1) at 21 degrees C. (C) 2009 Elsevier B.V. All rights reserved.
publisher ELSEVIER SCIENCE SA
issn 1385-8947
year published 2009
volume 151
issue 1-3
beginning page 247
ending page 254
digital object identifier (doi) 10.1016/j.cej.2009.02.035
web of science category Engineering, Environmental; Engineering, Chemical
subject category Engineering
unique article identifier WOS:000274348300032
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