Abstract
AbstractAttention 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 (SBET) of the new adsorbent were 526 mg/g and 630 m2/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 UO2(NO3)2.6H2O and Th(NO3)4.5H2O. The adsorption parameters for the two radioelements were determined by application of the Langmuir, Freundlich and Elovich models.
Highlights
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]
Properties of a new adsorbent To found the best properties of the prepared adsorbent, numerous experimental were carried at different conditions of preparation with the change of activation temperature, time in furnace, nature of atmosphere gases and conditions of preprocessing [17,18]
The maximum adsorption capacity of methylene blue, the specific area (SBET), the total surfaces acidity and the electronic microsonde data for this adsorbent (P15) compared to those of precursor R3H were presented in table 3 and 4
Summary
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]. A number of processes for the treatment by natural and synthetic materials [6,7,8] has been reported, the principal ones being based on the elimination of specific species such as U, Th and Ra by organic, inorganic, or composite (polymer and metallic oxides) adsorbents [9,10,11,12] In this context, the utilization of Moroccan oil shale of Tarfaya (layer R3) as a raw material for production of a new adsorbents and the adsorption capacity for radionuclides U and Th, by these products have been studied. The curves of kinetics and isotherms adsorption were presented and the adsorption parameters for the two radioelements were determined by application of the Langmuir, Freundlich and Elovich models
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