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http://hdl.handle.net/10773/19447
Título: | Experimental measurement and modeling of ion exchange equilibrium and kinetics of cadmium(II) solutions over microporous stannosilicate AV-6 |
Autor: | Cardoso, Simao P. Azenha, Ivo S. Lin, Zhi Portugal, Ines Rodrigues, Alirio E. Silva, Carlos M. |
Palavras-chave: | LANTHANIDE SILICATE EU-AV-20 MAXWELL-STEFAN APPROACH EXCESS GIBBS ENERGY TITANOSILICATE ETS-4 AQUEOUS-SOLUTION STRUCTURAL-CHARACTERIZATION MASS-TRANSFER METAL-IONS REMOVAL SYSTEMS |
Data: | 2016 |
Editora: | ELSEVIER SCIENCE SA |
Resumo: | Microporous stannosilicate AV-6 was investigated for cadmium(II) removal from aqueous solutions in batch experiments. Ion exchange equilibrium of the Cd2+/K+/AV-6 system was modeled using the mass action law combined with activity coefficient models for the solution (ideal, Debye-Htickel and Pitzer equations) and for the solid (Wilson equation) with absolute average relative deviations (AARDs) between 6.56% and 6.75%. It was concluded that the system embodies strong intraparticle non-idealities, namely solid activity coefficients between 0.2602 and 0.7180 for Cd2+. The kinetics of cadmium(II) sorption was analyzed measuring removal curves and modeling the data with pseudo-first and pseudo-second order expressions, commonly adopted in the literature, and with Maxwell-Stefan (MS) and Nernst-Plank (NP) based models. The best results were achieved by MS and NP approaches, for which AARD was 3.74% and 3.71%, respectively. The kinetic performance of the ion exchange was also discussed taking into account structural aspects of the AV-6 material. (C) 2016 Elsevier B.V. All rights reserved. |
Peer review: | yes |
URI: | http://hdl.handle.net/10773/19447 |
DOI: | 10.1016/j.cej.2016.03.007 |
ISSN: | 1385-8947 |
Versão do Editor: | 10.1016/j.cej.2016.03.007 |
Aparece nas coleções: | CICECO - Artigos |
Ficheiros deste registo:
Ficheiro | Descrição | Tamanho | Formato | |
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Experimental measurement and modeling of ion exchange equilibrium and kinetics of cadmium(II) solutions over microporous stannosilicate AV-6_10.1016j.cej.2016.03.007.pdf | 932.32 kB | Adobe PDF |
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