Thorium removal from aqueous solutions of Mexican erionite and X zeolite |
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| Authors: | M G Salinas-Pedroza M T Olguín |
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| Institution: | (1) Departamento de Química, Instituto Nacional de Investigaciones Nucleares, A. P. 18-1027, Col. Escandón, Delegación Miguel Hidalgo, C. P. 11801, México, D. F., México;(2) Facultad de Química, Universidad Autónoma del Estado de México Paseo Colón y Paseo Tollocan s/n, Toluca, Estado de México |
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| Abstract: | Thorium(IV) removal from aqueous solutions by erionite and X zeolite was investigated. The Th(IV) uptake at different thorium
nitrate concentrations (from 0.25 to 25 mM) was evaluated. The thorium content in the aqueous solution was determined by neutron
activation analysis. Th(IV) retained by zeolites was 1.7 and 3.7 meq/g for erionite and X zeolite. In order to explain the
thorium sorption process in both zeolites, ion exchange mechanism was considered. It was found that thorium sorption behavior
is strongly dependent of the type of zeolite, the separation factor for Mexican erionite was αTh(IV)
Na(I)<1, this zeolite shows preference for Na(I) rather than for Th(IV), however, by X zeolite, αTh(IV)
Na(I)~1, this value suggested an approximately ideal ion exchange behavior. The effect of pH on thorium sorption was also considered.
This revised version was published online in August 2006 with corrections to the Cover Date. |
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