resumo
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.
palavras-chave
CESIUM ION-EXCHANGE; TITANOSILICATE ETS-4; AQUEOUS-SOLUTIONS; CRYSTALLINE SILICOTITANATE; CHELATING RESIN; HG2+ IONS; MECHANISM; ZEOLITE; BATCH; WATER
categoria
Engineering
autores
Figueiredo, BR; de Melo, MMR; Portugal, I; Ananias, D; Rocha, J; Silva, CM
nossos autores
Bruno Reis Figueiredo
Estudante de doutoramento
Carlos Manuel Silva
Professor associado
Duarte Ananias
Investigador Auxiliar
Inês Portugal
Professor Auxiliar
João Rocha
Prof. Catedrático
Marcelo Morais Rodrigues de Melo
Bolseiro de pós-Doutoramentoagradecimentos
B.R. Figueiredo acknowledges a Ph.D. Grant from Fundacao para a Ciencia e a Tecnologia (SFRH/BD/75457/2010). This work was developed in the scope of the project CICECO-Aveiro Institute of Materials (Ref. FCT UID/CTM/50011/2013), financed by national funds through the FCT/MEC and when applicable co-financed by FEDER under the PT2020 Partnership Agreement.