Retention behavior of anionic radionuclides using metal hydroxide sludge

Mostafa M. Hamed; I. M. Ahmed; M. Holiel

doi:10.1515/ract-2019-0010

Artikel

Retention behavior of anionic radionuclides using metal hydroxide sludge

Mostafa M. Hamed , I. M. Ahmed und M. Holiel

Veröffentlicht/Copyright: 28. März 2019

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Aus der Zeitschrift Radiochimica Acta Band 107 Heft 12

Abstract

With the speedy growth of nuclear power production, the removal and disposal of radioactive nuclides such as ¹²⁹I, ⁹⁹Tc, ⁷⁹Se, ³⁶Cl, ⁹³Mo, and ¹³⁷Cs become major environmental security issues. Retention of these radionuclides, especially anionic species such as ¹²⁹I (t_1/2 1.7 × 10⁷ years), ⁹³Mo (t_1/2 4 × 10³ years) and ⁷⁹Se (t_1/2 3.27 × 10⁵ years) has been challenging. ¹²⁹I, ⁹³Mo and ⁷⁹Se bind very weakly to most sorbents and deposits. This study has examined the sorption potential of Metal hydroxide sludge (MHS) for ¹²⁵I (t_1/2 60.2 days), ⁹⁹Mo (t_1/2 2.75 days) and ⁷⁵Se (t_1/2 120 days) as a surrogate for ¹²⁹I, ⁹³Mo and ⁷⁹Se, respectively. MHS has been characterized by different techniques and the factors affecting the sorption processes were investigated. The experimental data were analyzed using kinetic models and thermodynamic parameters. The results showed that the kinetics of sorption of ¹²⁵I and ⁹⁹Mo on MHS proceeds according to the pseudo-first-order, on the contrary of ⁷⁵Se sorption follows pseudo second-order kinetic model. The maximum sorption capacity of MHS was found to be 51.2 mg/g, 46.5 mg/g and 40.2 mg/g for ¹²⁵I, ⁹⁹Mo and ⁷⁵Se, respectively. It can be concluded that, in the case of release of anionic radionuclide species to the surroundings the MHS could act as a succeeded and economical sorbent material for retention of different anionic radionuclides such as ^{133, 129}I, ⁷⁹Se, ³⁶Cl, ^{93, 99}Mo, and ⁹⁹Tc. To avoid the release of such anionic species from the stored nuclear wastes to the environment.

Keywords: 125I; 99Mo and 75Se; sorption; metal hydroxide sludge; backfill material

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Received: 2018-12-30

Accepted: 2019-02-24

Published Online: 2019-03-28

Published in Print: 2019-11-26

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Artikel in diesem Heft

https://doi.org/10.1515/ract-2019-0010

Schlagwörter für diesen Artikel

125I; 99Mo and 75Se; sorption; metal hydroxide sludge; backfill material