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Vol. 27 No. 12 (2015): Vol 27 Issue 12

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Sorption of Technetium-99 from Low-Level Radioactive Waste Using Different Adsorbent Materials

https://doi.org/10.14233/ajchem.2015.19184
H.M.H. Gad
Hot Labs & Waste Management Center, Egyptian Atomic Energy Authority, Inshas, Cairo, Egypt
Yasser F. Lasheen
Hot Labs & Waste Management Center, Egyptian Atomic Energy Authority, Inshas, Cairo, Egypt
Ayman F. Seliman
Hot Labs & Waste Management Center, Egyptian Atomic Energy Authority, Inshas, Cairo, Egypt

Corresponding Author(s) : H.M.H. Gad

hamdigad22@gmail.com

Asian Journal of Chemistry, Vol. 27 No. 12 (2015): Vol 27 Issue 12

Abstract

This work aims to investigate the empathy and adsorption capacity of 99Tc in pertechnetate form (TcO4-) using three prepared activated carbons. The carbon samples were activated with phosphoric acid using 50 % saw dust + 50 % rice husk (C-1), 100 % saw dust (C-2) and 100 % rice husk (C-3). Adsorption of 99Tc is pH dependent, where the adsorbed value of 99Tc decreases as the pH increases. Around 3 h mixing time is enough for TcO4- sorption by C-1 and C-3, while 100 min are sufficient for adsorption by C-2. The distribution coefficients evaluated from this study reveal that the adsorption empathy towards TcO4- follows the sequence: C-2 > C-3 > C-1 with Kf values 16121, 6328 and 5431, respectively. The maximum adsorption capacities (qmax) calculated from Langmuir equation follow sequence of: 316, 264 and 250 mg Kg-1 for C-2, C-3 and C-1 sample, respectively. The results showed that the locally prepared low-cost activated carbon is a promising candidate for a sustainable solution for 99Tc removal and immobilization.

Keywords

Pertechnetate Adsorption Activated carbon Low-level radioactive waste
Gad, H., F. Lasheen, Y., & F. Seliman, A. (2015). Sorption of Technetium-99 from Low-Level Radioactive Waste Using Different Adsorbent Materials. Asian Journal of Chemistry, 27(12), 4479–4484. https://doi.org/10.14233/ajchem.2015.19184
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