Brice Siroux - Academia.edu (original) (raw)

Papers by Brice Siroux

Research paper thumbnail of Interactions dans un système césium, strontium/matière organique naturelle/argiles des sols

Le projet de these s’inscrit dans le Projet Investissement d’Avenir (PIA) DEMETERRES, dont l’obje... more Le projet de these s’inscrit dans le Projet Investissement d’Avenir (PIA) DEMETERRES, dont l’objectif est le developpement de methodes et de technologies pour la decontamination et la remediation des sols et effluents contamines apres un accident nucleaire. L’objectif de cette these est de mieux apprehender les interactions de 137Cs et 90Sr avec les differentes composantes des terres agricoles et ainsi etre capable de predire l’etat chimique dans lequel ces elements se trouveraient dans les sols en cas d’accident nucleaire. Une base de donnees dans le formalisme des echangeurs d’ions multi-sites a ete mise en place, representant les comportements d’adsorption de Cs+ et Sr2+ dans les illites et smectites (deux des principaux mineraux argileux) vis-a-vis des cations majeurs environnementaux H+, Na+ et Ca2+. Cette base de donnees a par la suite ete utilisee pour tenter de predire le comportement d’adsorption de Cs+ et Sr2+ dans des echantillons de sols agricoles francais (Pusignan, Eto...

Research paper thumbnail of On the use of a multi-site ion-exchange model to predictively simulate the adsorption behaviour of strontium and caesium onto French agricultural soils

Applied Geochemistry, 2021

In case of nuclear accident, 90Sr and 134,137Cs are major radionuclides to account. In previous w... more In case of nuclear accident, 90Sr and 134,137Cs are major radionuclides to account. In previous works (Appl. Geochem. 87, 167; ibid 93, 167), a database of ion-exchange parameters allowing the description of the Sr2+ and Cs+ adsorption on purified illite and smectite was developed for a multi-site ion-exchange (MSIE) model. In this study, the adsorption behaviours of Sr2+ and Cs+ were obtained with <150 μm fractions of French soil samples: a cambisol fluvic, a calcosol, and a cambisol typic. The <2 μm fractions of the soil samples were analysed by X-ray diffraction to estimate their clay minerals proportions that were then approximated to an illite/smectite mixture, in consistency with the CEC of the <150 μm fractions. The database was implemented with K-illite and -smectite parameters to account for the amendment of K+ in agricultural soils. The isotherms of Sr2+ and Cs+ on the three soils — at 0.033 mol kgw-1 CaCl2 (I = 0.1 mol kgw-1) and at the pH value of the water equi...

Research paper thumbnail of On the use of a multi-site ion-exchange model to predictively simulate the adsorption behaviour of strontium and caesium onto French agricultural soils

Research paper thumbnail of Adsorption of strontium and caesium onto an Na-illite and Na-illite/Na-smectite mixtures: Implementation and application of a multi-site ion-exchange model

Applied Geochemistry

The application of a multi-site ion-exchange (MSIE) model to the prediction of contaminant behavi... more The application of a multi-site ion-exchange (MSIE) model to the prediction of contaminant behaviour onto soils or sediments requires a coherent adsorption database. Following the same approach exposed in preceding works on smectite (Siroux et al., Appl. Geochem. 87, 167; Wissocq et al., Appl. Geochem., 93, 167), a database is here implemented to allow modelling the adsorption of radionuclides 90 Sr and 137 Cs onto Naillite, one of the major clay mineral encountered in the terrestrial environment. This database allows describing the adsorption properties of Sr 2+ and Cs + competing with major cations H +-considered as the reference cation-and Na + onto an Na-illite. To obtain the adsorption site capacities and selectivity coefficients of illite sites for Na + towards H + , a saturation curve of Na + on Na-conditioned illite was acquired. Adsorption isotherms issued from literature have been reinterpreted using the MSIE model to obtain the adsorption properties of Sr 2+ and Cs + onto purified and Na-conditioned illite. Afterwards, the predictability and robustness of the database were verified simulating experimental adsorption of Sr 2+ and Cs + onto Na-illite/Na-smectite mixtures.

Research paper thumbnail of Simulation of Sr Transport in Soil Column

Procedia Earth and Planetary Science, 2017

Research paper thumbnail of Adsorption of strontium and caesium onto an Na-MX80 bentonite: Experiments and building of a coherent thermodynamic modelling

Applied Geochemistry

Multi-site ion exchange modelling permits describing the different adsorption behaviour of cation... more Multi-site ion exchange modelling permits describing the different adsorption behaviour of cations onto clay minerals. Considering several adsorption sites in the clay minerals' structure allows accurately representing the overall variations of adsorption behaviours. For a wider applicability in soils and sediments, it appears necessary to build a coherent thermodynamic adsorption database for radionuclides. 90 Sr and 134,137 Cs are major radionuclides to be considered in the case of nuclear accidents, but thermodynamic data on their adsorption on purified smectites are scarce. Therefore, a detailed study to determine Sr 2+ and Cs + adsorption parameter on smectite seems necessary. To provide this kind of information, this study is proposing multi-site ion exchange modelling of the adsorption of Sr 2+ and Cs + onto a pure Na-MX80 montmorillonite. The intrinsic parameters-site concentration and corrected selectivity coefficient for the Na + /H + exchange-were first fitted using an already available Na saturation curve of a purified smectite. The adsorption of Sr 2+ and Cs + on a purified Na-MX80 bentonite was explored, including a kinetic study for Sr, as a function of pH and equilibrium concentration. The isotherms were modelled to determine the corrected selectivity coefficients for the 2Na + /Sr 2+ and Na + /Cs + exchange reactions. This study provides a part of a wider databasis that is currently under construction, which can be used to predict the adsorption of Sr and Cs in soils and sediments.

Research paper thumbnail of DEMETERRES project: development of innovative technologies for removing radionuclides from contaminated solid and liquid matrices

EPJ Web of Conferences

As part of the « post-accidental » management, the DEMETERRES project (RSNR PIA) proposes to deve... more As part of the « post-accidental » management, the DEMETERRES project (RSNR PIA) proposes to develop innovative and environmentally friendly methods for removal of cesium and strontium from soils and liquid matrices in order to rehabilitate them for an agricultural use while minimizing the volume of generated wastes in accordance with the nuclear waste existing processes. Complementary approaches are used: they are based on physico-chemical technologies (such as foams flotation, supercritical CO2 extraction, extractants in fluidized bed reactor …) and biological ones (bioextractants, phytoextraction) which concepts are described. These researches aim to design innovative and performing extractants in term of selectivity and to achieve the pilot reactor phase for each of them. These pilots will group in a network to provide a technological platform lasting the project, to which will be attached an available network of experts. The respective advances of these researches are presented, completed of tests initiated in Japan on contaminated soils through partnerships.

Research paper thumbnail of Interactions dans un système césium, strontium/matière organique naturelle/argiles des sols

Le projet de these s’inscrit dans le Projet Investissement d’Avenir (PIA) DEMETERRES, dont l’obje... more Le projet de these s’inscrit dans le Projet Investissement d’Avenir (PIA) DEMETERRES, dont l’objectif est le developpement de methodes et de technologies pour la decontamination et la remediation des sols et effluents contamines apres un accident nucleaire. L’objectif de cette these est de mieux apprehender les interactions de 137Cs et 90Sr avec les differentes composantes des terres agricoles et ainsi etre capable de predire l’etat chimique dans lequel ces elements se trouveraient dans les sols en cas d’accident nucleaire. Une base de donnees dans le formalisme des echangeurs d’ions multi-sites a ete mise en place, representant les comportements d’adsorption de Cs+ et Sr2+ dans les illites et smectites (deux des principaux mineraux argileux) vis-a-vis des cations majeurs environnementaux H+, Na+ et Ca2+. Cette base de donnees a par la suite ete utilisee pour tenter de predire le comportement d’adsorption de Cs+ et Sr2+ dans des echantillons de sols agricoles francais (Pusignan, Eto...

Research paper thumbnail of On the use of a multi-site ion-exchange model to predictively simulate the adsorption behaviour of strontium and caesium onto French agricultural soils

Applied Geochemistry, 2021

In case of nuclear accident, 90Sr and 134,137Cs are major radionuclides to account. In previous w... more In case of nuclear accident, 90Sr and 134,137Cs are major radionuclides to account. In previous works (Appl. Geochem. 87, 167; ibid 93, 167), a database of ion-exchange parameters allowing the description of the Sr2+ and Cs+ adsorption on purified illite and smectite was developed for a multi-site ion-exchange (MSIE) model. In this study, the adsorption behaviours of Sr2+ and Cs+ were obtained with <150 μm fractions of French soil samples: a cambisol fluvic, a calcosol, and a cambisol typic. The <2 μm fractions of the soil samples were analysed by X-ray diffraction to estimate their clay minerals proportions that were then approximated to an illite/smectite mixture, in consistency with the CEC of the <150 μm fractions. The database was implemented with K-illite and -smectite parameters to account for the amendment of K+ in agricultural soils. The isotherms of Sr2+ and Cs+ on the three soils — at 0.033 mol kgw-1 CaCl2 (I = 0.1 mol kgw-1) and at the pH value of the water equi...

Research paper thumbnail of On the use of a multi-site ion-exchange model to predictively simulate the adsorption behaviour of strontium and caesium onto French agricultural soils

Research paper thumbnail of Adsorption of strontium and caesium onto an Na-illite and Na-illite/Na-smectite mixtures: Implementation and application of a multi-site ion-exchange model

Applied Geochemistry

The application of a multi-site ion-exchange (MSIE) model to the prediction of contaminant behavi... more The application of a multi-site ion-exchange (MSIE) model to the prediction of contaminant behaviour onto soils or sediments requires a coherent adsorption database. Following the same approach exposed in preceding works on smectite (Siroux et al., Appl. Geochem. 87, 167; Wissocq et al., Appl. Geochem., 93, 167), a database is here implemented to allow modelling the adsorption of radionuclides 90 Sr and 137 Cs onto Naillite, one of the major clay mineral encountered in the terrestrial environment. This database allows describing the adsorption properties of Sr 2+ and Cs + competing with major cations H +-considered as the reference cation-and Na + onto an Na-illite. To obtain the adsorption site capacities and selectivity coefficients of illite sites for Na + towards H + , a saturation curve of Na + on Na-conditioned illite was acquired. Adsorption isotherms issued from literature have been reinterpreted using the MSIE model to obtain the adsorption properties of Sr 2+ and Cs + onto purified and Na-conditioned illite. Afterwards, the predictability and robustness of the database were verified simulating experimental adsorption of Sr 2+ and Cs + onto Na-illite/Na-smectite mixtures.

Research paper thumbnail of Simulation of Sr Transport in Soil Column

Procedia Earth and Planetary Science, 2017

Research paper thumbnail of Adsorption of strontium and caesium onto an Na-MX80 bentonite: Experiments and building of a coherent thermodynamic modelling

Applied Geochemistry

Multi-site ion exchange modelling permits describing the different adsorption behaviour of cation... more Multi-site ion exchange modelling permits describing the different adsorption behaviour of cations onto clay minerals. Considering several adsorption sites in the clay minerals' structure allows accurately representing the overall variations of adsorption behaviours. For a wider applicability in soils and sediments, it appears necessary to build a coherent thermodynamic adsorption database for radionuclides. 90 Sr and 134,137 Cs are major radionuclides to be considered in the case of nuclear accidents, but thermodynamic data on their adsorption on purified smectites are scarce. Therefore, a detailed study to determine Sr 2+ and Cs + adsorption parameter on smectite seems necessary. To provide this kind of information, this study is proposing multi-site ion exchange modelling of the adsorption of Sr 2+ and Cs + onto a pure Na-MX80 montmorillonite. The intrinsic parameters-site concentration and corrected selectivity coefficient for the Na + /H + exchange-were first fitted using an already available Na saturation curve of a purified smectite. The adsorption of Sr 2+ and Cs + on a purified Na-MX80 bentonite was explored, including a kinetic study for Sr, as a function of pH and equilibrium concentration. The isotherms were modelled to determine the corrected selectivity coefficients for the 2Na + /Sr 2+ and Na + /Cs + exchange reactions. This study provides a part of a wider databasis that is currently under construction, which can be used to predict the adsorption of Sr and Cs in soils and sediments.

Research paper thumbnail of DEMETERRES project: development of innovative technologies for removing radionuclides from contaminated solid and liquid matrices

EPJ Web of Conferences

As part of the « post-accidental » management, the DEMETERRES project (RSNR PIA) proposes to deve... more As part of the « post-accidental » management, the DEMETERRES project (RSNR PIA) proposes to develop innovative and environmentally friendly methods for removal of cesium and strontium from soils and liquid matrices in order to rehabilitate them for an agricultural use while minimizing the volume of generated wastes in accordance with the nuclear waste existing processes. Complementary approaches are used: they are based on physico-chemical technologies (such as foams flotation, supercritical CO2 extraction, extractants in fluidized bed reactor …) and biological ones (bioextractants, phytoextraction) which concepts are described. These researches aim to design innovative and performing extractants in term of selectivity and to achieve the pilot reactor phase for each of them. These pilots will group in a network to provide a technological platform lasting the project, to which will be attached an available network of experts. The respective advances of these researches are presented, completed of tests initiated in Japan on contaminated soils through partnerships.