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131I− Sorption by Thermally Treated Hydrotalcites

Published online by Cambridge University Press:  28 February 2024

María Teresa Olguín ,
Pedro Bosch ,
Dwight Acosta  and
Silvia Bulbulian
María Teresa Olguín
Affiliation:
Instituto Nacional de Investigaciones Nucleates, A.P. 18-1027, Col. Escandón, Delegación Miguel Hidalgo, C.P. 11801, México, D.F.
Pedro Bosch
Affiliation:
Universidad Autónoma Metropolitana, Iztapalapa, Michoacán y Purísima, A.P. 55-532, Iztapalapa, C.P. 09340, México, D.F.
Dwight Acosta
Affiliation:
Universidad Nacional Autónoma de México, Instituto de Física de la UNAM, Ciudad Universitaria A.P. 70-360, C.P. 04510, México, D.F.
Silvia Bulbulian
Affiliation:
Instituto Nacional de Investigaciones Nucleates, A.P. 18-1027, Col. Escandón, Delegación Miguel Hidalgo, C.P. 11801, México, D.F.
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Abstract

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The sorption capacity of hydrotalcite (HT) and its calcined product (CHT) was evaluated for 131I− sorption from water solution and it was determined as a function of the calcining temperature. The radionuclide content was determined by γ-spectrometry. Solids were characterized by thermal analysis, X-ray diffraction (XRD), electron microscopy and Brunauer-Emmett-Teller (BET) analysis. For 0.1 M Na I solution, labeled with 131I−, sorption capacity was found to be 0.24 meq g−1 (7.2% of the anion exchange capacity, AEC). But, if the sample was previously calcined at 773 K and the HT structure destroyed, the sorption of I− increased considerably, up to 2.08 meq g−1 (63% of the AEC) and the HT structure was reconstructed. The 131I− sorption at very low concentrations (10−14M) was 0.04 × 10−14 meq of 131I− g−1 in the noncalcined HT, but for calcined samples at 773 K, the sorption increased to circa 0.97 × 10−14 meq g−1. Calcination temperature determines the surface area of the resulting mixed oxides, and that property seems to be the most important factor controlling the I− sorption. If the calcination temperature was increased to 873 K, the specific surface area of the oxide mixture increased and I− sorption increased as well, whereas calcination of HT at 973–1073 K resulted in a low surface area and a low I− retention.

Keywords

Hydrotalcites131I−131I− SorptionAnion ExchangeMagnesium Aluminum OxideRadioactive WasteRadioactive DecontaminationThermal Treatment
Type
Research Article
Information
Clays and Clay Minerals , Volume 46 , Issue 5 , October 1998 , pp. 567 - 573
Copyright
Copyright © 1998, The Clay Minerals Society

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