Assessment of synthetic zeolite Na A–X as sorbing barrier for strontium in a radioactive disposal facility

The retention of strontium onto synthetic zeolite Na A–X, candidate as backfill material in a near surface disposal facility, was studied using batch and column techniques. In order to investigate the sorption mechanism, the kinetic data were tested using pseudo-first-order, pseudo-second-order, hom...

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Published inChemical engineering journal (Lausanne, Switzerland : 1996) Vol. 157; no. 1; pp. 100 - 112
Main Authors Rahman, R.O. Abdel, Ibrahim, H.A., Hanafy, M., Monem, N.M. Abdel
Format Journal Article
LanguageEnglish
Published Oxford Elsevier B.V 15.02.2010
Elsevier
Subjects
Applied sciences
Barriers
Chemical engineering
Disposal
Engineered barrier
Entropy
Exact sciences and technology
Free energy
Mathematical models
Pollution
Radioactive waste
Radioactive wastes
Sorption
Strontium
Wastes
Zeolites
Sorption
Radioactive waste
Mathematical models
Disposal
Engineered barrier
Second order
Enthalpy
Entropy
Zeolite
Retention
Modeling
Free energy
Design
Batchwise
First order
Analytical method
pH
Kinetics
Thermodynamic properties
Mathematical model
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Summary:The retention of strontium onto synthetic zeolite Na A–X, candidate as backfill material in a near surface disposal facility, was studied using batch and column techniques. In order to investigate the sorption mechanism, the kinetic data were tested using pseudo-first-order, pseudo-second-order, homogenous particle, and intraparticle models. The suitability of the geochemical conditions was preliminarily assessed by conducting equilibrium sorption studies at different pH ranging from 2.0 to 9.0. To optimize the design of the barrier, the effect of the initial concentration on the retention of Sr 2+ onto the proposed material at three temperatures was investigated. The sorption equilibrium data were analyzed using non-linear Freundlich, Langmuir, and D–R models to evaluate the sorption characteristics and the thermodynamic parameters such as changes in free energy (Δ G), enthalpy (Δ H), and entropy (Δ S) were calculated. To assess the effect of the utilized method to determine the retardation coefficients on the predicted concentration, a simple pulse analytical model was used.
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content type line 23
ISSN:1385-8947
1873-3212
DOI:10.1016/j.cej.2009.10.057