Effect of pH on cadmium (II) removal from aqueous solution using titanosilicate ETS-4
authors Barreira, LD; Lito, PF; Antunes, BM; Otero, M; Lin, Z; Rocha, J; Pereira, E; Duarte, AC; Silva, CM
nationality International
journal CHEMICAL ENGINEERING JOURNAL
author keywords Cadmium; ETS-4; Ion exchange; Batch experiments; Nernst-Planck
keywords HEAVY-METAL IONS; LENGTH-COLUMN METHOD; ZEOLITE-A; DIFFUSION-COEFFICIENTS; EXCHANGE PROCESSES; MASS-TRANSFER; SODIUM-IONS; WASTE-WATER; CLINOPTILOLITE; ADSORPTION
abstract Cadmium is one of the most toxic contaminants of superficial waters, whose effects are particularly harmful to human health. In 20 years the European Union will impose total elimination of cadmium from industrial discharges. Such facts induce researchers to develop fine separation processes for cadmium removal, especially at the tertiary treatment level. In this work, we studied the applicability of the microporous titanosilicate ETS-4 (Engelhard Titanium Silicates No. 4) to uptake Cd(2+) from aqueous solution, in order to evaluate its potential as ion exchanger material. The effect of pH was investigated by performing batch stirred tank experiments. The results obtained shown that Cd(2+) removal increases up till pH 6, which is a very important conclusion since this value is commonly found in effluents and other wastewaters. The equilibrium data at pH 6 were accurately represented by the Langmuir-Freundlich isotherm under the experimental conditions studied (average absolute deviation, AAD=1.67%). The amount of Cd(2+) removed by ETS-4 at pH 6 clearly surmount results found in literature for the same titanosilicate at pH 4 and for different materials. The kinetic of Cd(2+) uptake by ETS-4 was analyzed using a Nernst-Planck based model. The absolute average deviation found point out the reasonable data representation accomplished by Nernst-Planck: AAD=17.2%. (C) 2009 Elsevier B. V. All rights reserved.
publisher ELSEVIER SCIENCE SA
issn 1385-8947
year published 2009
volume 155
issue 3
beginning page 728
ending page 735
digital object identifier (doi) 10.1016/j.cej.2009.09.014
web of science category Engineering, Environmental; Engineering, Chemical
subject category Engineering
unique article identifier WOS:000274770500022
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