Ion exchange and structural properties of a new cyanoferrate mesoporous silica material for Cs removal from natural saline waters - Mines Paris Accéder directement au contenu
Article Dans Une Revue Journal of Environmental Chemical Engineering Année : 2017

Ion exchange and structural properties of a new cyanoferrate mesoporous silica material for Cs removal from natural saline waters

Résumé

The demand for effective and inexpensive treatment for decontamination of waters from radionuclides, such as 137 Cs, is presently high. In this context a selective adsorbent material for Cs (SORBMATECH 1 202) was designed, consisting of potassium/copper ferrocyanide nanoparticles deposited in the mesoporosity of silica grains. Several batch experiments were carried out in order to obtain kinetic and thermodynamic data concerning the ion exchange. Isotherms and measurements of distribution coefficients (K d,Cs ) in waters of increasing salinity (pure water, Ca-bicarbonate fresh water and seawater) were conducted in a radioactive environment. This study shows a fast ion-exchange kinetics (<5 min), due to the open silica porosity combined to cyanoferrate nanoparticles, as well as high selectivity with K d,Cs in fresh and sea waters (10 6 and 2.0 Â 10 5 mL/g, respectively). These experiments also demonstrated the competitive effects of the major cations present in natural waters (K + , Na + , Mg 2+ and Ca 2+ ) and led to the determination of the Vanselow’s selectivity coefficients. Integrating this dataset into the CHESS geochemical speciation code allowed the correct modeling of K d,Cs values in these different water types over a wide range of Cs concentrations. The dataset can be extrapolated to the modeling of other K- ferrocyanides and effluent compositions.

Domaines

Géochimie
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Dates et versions

hal-01450640 , version 1 (31-01-2017)

Identifiants

  • HAL Id : hal-01450640 , version 1

Citer

Caroline Michel, Yves Barré, Laurent de Windt, Caroline de Dieuleveult, Emmanuelle Brackx, et al.. Ion exchange and structural properties of a new cyanoferrate mesoporous silica material for Cs removal from natural saline waters. Journal of Environmental Chemical Engineering, 2017, 5, pp.810-817. ⟨hal-01450640⟩
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