| Autor: |
Hassan Hannache, A. Noureddine, René Pailler, M. Ezzine, E. Khouya, S. Fakhi, K. Legrouri |
| Rok vydání: |
2010 |
| Předmět: |
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| Zdroj: |
Nature Precedings. |
| ISSN: |
1756-0357 |
| Popis: |
Attention has been focused recently on the production of new adsorbents from Moroccan oil shale of Tarfaya (layer R3) by chemical activation with phosphoric acid and its application in wastewaters treatment. The optimal conditions for the preparation were searched and the tests of adsorption of uranium and thorium ions were affected. The best product was obtained by used of the ratio of activated agent/precursor equal 3 and activation of the mixture in air at 250°C during two hours after prepocessing at 120°C in air. Under these conditions the maximal adsorption capacity of methylene blue and specific area (S BET ) of the new adsorbent were 526 mg/g and 630 m 2 /g, respectively. A batch mode experiment was used to explore the performances of this adsorbent for the removal of the U and Th from aqueous solutions prepared from UO 2 (NO 3 ) 2 .6H 2 O and Th(NO 3 ) 4 .5H 2 O. The adsorption parameters for the two radioelements were determined by application of the Langmuir, Freundlich and Elovich models. Keywords : oil shale – activation – phosphoric acid – adsorpti on – methylene blue –radionuclide – isotherms Introduction To satisfy the increasing number of directives referring to the control of environmental radioactivity and its health aspects, numerous treatments of radioactive waste have been developed [1]. Considering the potential risks presented by radionuclides for humans and the environment [2-5], it is necessary to envisage the problem for all nuclear activities. A number of processes for the treatment by natural and synthetic materials [6-8] has been reported, the principal ones being based on the elimination of specific species such as U, Th and Ra by |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
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