Fixed-bed removal of Cs+ from aqueous solutions by microporous silicate ETS-4: Measurement and modeling of loading-regeneration cycles
authors Figueiredo, BR; Portugal, I; Rocha, J; Silva, CM
nationality International
journal CHEMICAL ENGINEERING JOURNAL
author keywords Cesium; Cyclic operation; ETS-4; Fixed-bed; Ion exchange; Nernst-Planck; Regeneration
keywords ION-EXCHANGE PROPERTIES; TITANOSILICATE ETS-4; LANTHANIDE SILICATE; HG2+ IONS; CESIUM; STRONTIUM; WASTE; WATER; PURIFICATION; ADSORPTION
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.
publisher ELSEVIER SCIENCE SA
issn 1385-8947
year published 2016
volume 301
beginning page 276
ending page 284
digital object identifier (doi) 10.1016/j.cej.2016.04.112
web of science category Engineering, Environmental; Engineering, Chemical
subject category Engineering
unique article identifier WOS:000378470700031
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