Uptake of cesium and strontium by crystalline silicotitanates from radioactive wastes

S. Chitra; S. Viswanathan; S. Rao; P. Sinha

doi:10.1007/s10967-010-0867-z

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Journal of Radioanalytical and Nuclear Chemistry

Volume/Issue:: Volume 287: Issue 3

Uptake of cesium and strontium by crystalline silicotitanates from radioactive wastes

Authors:

S. Chitra

S. Chitra Centralised Waste Management Facility, Bhabha Atomic Research Centre Facilities, Kalpakkam, 603102 India

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S. Viswanathan

S. Viswanathan Centralised Waste Management Facility, Bhabha Atomic Research Centre Facilities, Kalpakkam, 603102 India

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S. Rao

S. Rao Centralised Waste Management Facility, Bhabha Atomic Research Centre Facilities, Kalpakkam, 603102 India

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, and

P. Sinha

P. Sinha Centralised Waste Management Facility, Bhabha Atomic Research Centre Facilities, Kalpakkam, 603102 India

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Pages:: 955–960

Online Publication Date:: 17 Oct 2010

Publication Date:: 01 Mar 2011

Article Category:: Research Article

DOI:: https://doi.org/10.1007/s10967-010-0867-z

Keywords:: Crystalline silicotitanate; Distribution coefficient; Decontamination factor; Cesium; Strontium

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Abstract

Crystalline silicotitanate inorganic ion exchanger, with a sitinakite structure is candidate material for remediation of aqueous nuclear waste streams. The syntheses of crystalline silicotitanate (CST) and Nb-substituted crystalline silcotitanate (Nb-CST) were carried out under hydrothermal conditions and the products were characterized using techniques viz., XRD, SEM/EDS, DTA/TGA, surface area respectively. Batch experiments were carried out to study the kinetics of uptake of ¹³⁷Cs and ⁹⁰Sr, to estimate the decontamination factor (DF) values and distribution coefficients (K_d) for the above synthesized CST and Nb-CST samples from actual radioactive waste solutions. The DF values for uptake of Cs and Sr by Nb-CST after 24 h of equilibration was 355 and 136 whereas for CST it was found to be 40 and 176 respectively. The K_d values for uptake of Cs and Sr for Nb-CST after 24 h of equilibration was found to be 35,490 and 13,500 mL/g respectively whereas the K_d values for uptake of Cs and Sr for CST was found to be 4,025 and 17,525 mL/g respectively. The ion exchange capacity of Nb-CST towards ⁹⁰Sr and ¹³⁷Cs was estimated to be 11.8 and 3.2 meq/g respectively whereas the ion exchange capacity of CST towards ⁹⁰Sr and ¹³⁷Cs was estimated to be 14.6 and 4.4 meq/g respectively.

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Journal of Radioanalytical and Nuclear Chemistry

Print ISSN:: 0236-5731

Online ISSN:: 1588-2780

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Journal of Radionalytical and Nuclear Chemistry
Language	English
Size	A4
Year of Foundation	1968
Volumes per Year	1
Issues per Year	12
Founder	Akadémiai Kiadó
Founder's Address	H-1117 Budapest, Hungary 1516 Budapest, PO Box 245.
Publisher	Akadémiai Kiadó Springer Nature Switzerland AG
Publisher's Address	H-1117 Budapest, Hungary 1516 Budapest, PO Box 245. CH-6330 Cham, Switzerland Gewerbestrasse 11.
Responsible Publisher	Chief Executive Officer, Akadémiai Kiadó
ISSN	0236-5731 (Print)
ISSN	1588-2780 (Online)