Fixed-bed removal of Hg2+ from contaminated water by microporous titanosilicate ETS-4: Experimental and theoretical breakthrough curves
authors Lopes, CB; Pereira, E; Lin, Z; Pato, P; Otero, M; Silva, CM; Rocha, J; Duarte, AC
nationality International
journal MICROPOROUS AND MESOPOROUS MATERIALS
author keywords Fixed-bed operation; Mercury; Sorption-desorption cycles; Titanosilicate; Ion-exchange
keywords AQUEOUS-SOLUTIONS; ION-EXCHANGE; ACTIVATED CARBON; MERCURY REMOVAL; INORGANIC MERCURY; WASTE-WATER; ADSORPTION; COLUMN; SORPTION; EQUILIBRIUM
abstract The present study reports the assembly and operation of a fixed bed using the microporous titanosilicate ETS-4 as sorbent. Sorption-desorption cycles were carried out on an ETS-4 fixed-bed, for the removal of Hg2+ from contaminated water. The sorption capacity of the ETS-4 in the column in two consecutive cycles remained constant (33.6 and 33.3 mg g(-1), respectively); however due to certain difficulties encountered during ETS-4 packaging and operation mode, breakthrough curves corresponding to these cycles showed dissimilar patterns. A concentration gradient of an EDTA-Na-2 solution (0.05-0.25 M) was efficient for bed regeneration, achieving an elution efficiency of 98%. The elution curve had an asymmetrical shape, the concentration peak was attained in less than 5 min, and the concentration factor was 920. Four kinetic models, namely Thomas, Bohart-Adams, Clark and Yoon-Nelson, were applied to predict the breakthrough curves and to estimate the characteristic parameters of the column, which are the basis for the process design at a real scale. The operation of an ETS-4 fixed-bed for the treatment of Hg2+. contaminated waters was shown to be feasible, despite some limitations mainly related with its loose packing. (C) 2011 Elsevier Inc. All rights reserved.
publisher ELSEVIER SCIENCE BV
issn 1387-1811
year published 2011
volume 145
issue 1-3
beginning page 32
ending page 40
digital object identifier (doi) 10.1016/j.micromeso.2011.04.019
web of science category Chemistry, Applied; Chemistry, Physical; Nanoscience & Nanotechnology; Materials Science, Multidisciplinary
subject category Chemistry; Science & Technology - Other Topics; Materials Science
unique article identifier WOS:000294974100006
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