| Numéro |
J. Phys. IV France
Volume 123, March 2005
|
|
|---|---|---|
| Page(s) | 87 - 93 | |
| DOI | https://doi.org/10.1051/jp4:2005123014 | |
J. Phys. IV France 123 (2005) 87-93
DOI: 10.1051/jp4:2005123014
Production of a new adsorbent from Moroccan oil shale by chemical activation and its adsorption characteristics for U and Th bearing species
E. Khouya1, 2, S. Fakhi2, H. Hannache1, S. Ichcho1, R. Pailler3, R. Naslain3 and J.C. Abbe41 Laboratoire des Matériaux ThermoStructuraux, Faculté des Sciences Ben M'sik, BP. 7955, Casablanca, Maroc
2 Laboratoire de Radiochimie Faculté des sciences Ben M'sik Casablanca, Maroc
3 Laboratoire des Composites Thermostructuraux, UMR 5801 CNRS-CEA-SNECMA, Université Bordeaux 1, Domaine Universitaire, 3 allée de la Boétie, 33600 Pessac, France
4 Laboratoire d'Analyse SUBATECH École des Mines de Nantes, France
Abstract
New adsorbents were prepared from Moroccan oil shale
of Tarfaya (layer R3) by chemical activation with sulphuric acid diluted at
80%. The influence of activation temperature, atmosphere gas, holding
time in oven and weight ratio of sulphuric acid to precursor was
investigated by determination of yield of adsorbents and adsorption capacity
of methylene blue. The best adsorbent properties were found for a particular
combination of the chosen parameters: temperature and time of activation
respectively equal to 250
C and 2 hours, the gas vector being nitrogen
(N2). The adsorption capacity for methylene blue and specific surface
(S
of the new adsorbent were equal to 300 mg/g and 270 m2/g
respectively. The batch mode experiment was used to explore the feasibility
of this adsorbent for removal of radionuclides (U and Th) from aqueous
solution. Applicability of the adsorbent was examined for synthetic solution
prepared from hydrated uranyl nitrate (UO2(NO3)2.6H2O)
and hydrated thorium nitrate (Th(NO3)4.5H2O). The parameters
of adsorption for the two radioelements were determined by application of
the Langmuir, Freundlich and Elovich models.
© EDP Sciences 2005