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 Fixed-bed removal of Cs+ from aqueous solutions by microporous silicate ETS-4: Measurement and modeling of loading-regeneration cycles
Please use this identifier to cite or link to this item http://hdl.handle.net/10773/19960

title: Fixed-bed removal of Cs+ from aqueous solutions by microporous silicate ETS-4: Measurement and modeling of loading-regeneration cycles
authors: Figueiredo, Bruno R.
Portugal, Ines
Rocha, Joao
Silva, Carlos Manuel
keywords: ION-EXCHANGE PROPERTIES
TITANOSILICATE ETS-4
LANTHANIDE SILICATE
HG2+ IONS
CESIUM
STRONTIUM
WASTE
WATER
PURIFICATION
ADSORPTION
issue date: 2016
publisher: ELSEVIER SCIENCE SA
abstract: ETS-4 was prepared by hydrothermal synthesis and characterized by powder X-ray diffraction in order to assess its ion exchange capacity towards the removal of Cs+ from aqueous solutions in both batch and fixed-bed operation modes. Several assays were carried out to measure isotherm (8 experiments) and breakthrough curves (5 experiments); a set of loading-regeneration-loading experiments was also performed highlighting the ability of ETS-4 to be used in cyclic ion exchange. Powder X-ray diffraction showed that parent and Cs+-exchanged ETS-4 are isostructural. The Langmuir equation achieved good correlation results (average deviation of 6.58%), while the Nernst-Planck based model proposed for the fixed-bed assays fitted one breakthrough curve with 18.66% error, and was able to predict the remaining four experiments with 9.55% error. The Nernst-Planck parameters are the self-diffusion coefficients of Cs+ and Na+ in ETS-4, whose values (DCs+ = 3.193 x 10(-16) m(2) s(-1) and DNa+ = 6.088 x 10(-15) m(2) s(-1)) are consistent with the microporosity of ETS-4 framework and with the size of the counter ions. (C) 2016 Elsevier B.V. All rights reserved.
URI: http://hdl.handle.net/10773/19960
ISSN: 1385-8947
publisher version/DOI: http://doi.org/10.1016/j.cej.2016.04.112
source: CHEMICAL ENGINEERING JOURNAL
appears in collectionsCICECO - Artigos

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