Tb/Eu-AV-9: A lanthanide silicate for the sensing and removal of cesium ions from aqueous solutions
authors Figueiredo, BR; Ananias, D; Portugal, I; Rocha, J; Silva, CM
nationality International
journal CHEMICAL ENGINEERING JOURNAL
author keywords Cesium; Equilibrium; Tb/Eu-AV-9; Ion exchange; Maxwell-Stefan equations; Photoluminescence
keywords MICROPOROUS TITANOSILICATE ETS-10; EXCHANGE; WASTE; PURIFICATION; WASTEWATERS; ZEOLITE; SYSTEMS; METALS; WATERS; HG2+
abstract The ion exchange of Cs+ from aqueous solutions was studied using a novel microporous lanthanide silicate with photoluminescence properties, Tb/Eu-AV-9. This mixed lanthanide silicate was prepared by hydrothermal synthesis, characterized by scanning electron microscopy, powder X-ray diffraction, and photoluminescence spectroscopy. Batch ion exchange experiments were performed at room temperature (295 K) to measure isotherm and kinetics (removal curves). The Langmuir-Freundlich equation provided a good fit to the equilibrium data. A kinetic model based on the Maxwell-Stefan equations was implemented and adjusted to the cesium removal curves, and achieved average deviation of 8.37%. The model parameters were the diffusion coefficients, while the convective mass transfer coefficient was purely estimated. The Maxwell-Stefan diffusivities for the interaction of the counter ions Cs+ and K+ with the solid exchanger were D-AS = 8.373 x 10(-15) m(2) s(-1) and D-BS = 2.795 x 10(-14) m(2) s(-1), respectively, being consistent with other values in the literature. With respect to photoluminescence studies, the differences found between the emission spectra of native and CS+-exchanged Tb/Eu-AV-9 disclosed the potential of this sorbent for qualitative/quantitative CS+ sensing purposes. (C) 2015 Elsevier B.V. All rights reserved.
publisher ELSEVIER SCIENCE SA
issn 1385-8947
year published 2016
volume 286
beginning page 679
ending page 688
digital object identifier (doi) 10.1016/j.cej.2015.10.095
web of science category Engineering, Environmental; Engineering, Chemical
subject category Engineering
unique article identifier WOS:000366790000072
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