Please use this identifier to cite or link to this item:
http://hdl.handle.net/10773/20428
Title: | Cs+ removal and optical detection by microporous lanthanide silicate Eu-AV-20 in a fixed-bed column |
Author: | Figueiredo, Bruno R. de Melo, Marcelo M. R. Portugal, Ines Ananias, Duarte Rocha, Joao Silva, Carlos Manuel |
Keywords: | CESIUM ION-EXCHANGE TITANOSILICATE ETS-4 AQUEOUS-SOLUTIONS CRYSTALLINE SILICOTITANATE CHELATING RESIN HG2+ IONS MECHANISM ZEOLITE BATCH WATER |
Issue Date: | 2016 |
Publisher: | ELSEVIER SCIENCE SA |
Abstract: | Microporous silicate Eu-AV-20 has recently proved to be a promising ion exchange material for cesium removal from aqueous solutions, and its potential for Cs+ photoluminescence sensing was additionally demonstrated. In this work, Cs+ removal was performed in a fixed-bed column, and the influence of linear velocity and mass of ion exchanger on the breakthrough curves was analysed. The experimental data were modelled on the basis of Nernst-Planck (NP) equations and with four well-known analytic models. The analytic expressions provided low errors (root mean square deviation, RMSD, between 3.20% and 6.47%); the 2-parameter NP-based model fitted the data quite well (RMSD = 6.66% for correlation and 6.54% for prediction), yielding crucial information on both the transport mechanism within the Eu-AV-20 particles, and the intrinsic dynamic behaviour of the fixed-bed ion exchange column. Taking into account that Eu-AV-20 samples loaded with different amounts of Cs+ exhibited distinct photoluminescence spectra, our results reinforce the potential of AV-20 materials for Cs+ sensing, which raises the possibility of online monitoring the ion exchange in a fixed-bed column using an optical fibre and a spectrometer. (C) 2015 Elsevier B.V. All rights reserved. |
Peer review: | yes |
URI: | http://hdl.handle.net/10773/20428 |
DOI: | 10.1016/j.cej.2015.10.046 |
ISSN: | 1385-8947 |
Publisher Version: | 10.1016/j.cej.2015.10.046 |
Appears in Collections: | CICECO - Artigos |
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File | Description | Size | Format | |
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Cs+ removal and optical detection by microporous lanthanide silicate Eu-AV-20 in a fixed-bed column_10.1016j.cej.2015.10.046.pdf | 2.65 MB | Adobe PDF |
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