2Ecole Nationale Superieure de Chimie de Paris, Laboratoire d'Electrochirnie et de Chimie An... more 2Ecole Nationale Superieure de Chimie de Paris, Laboratoire d'Electrochirnie et de Chimie Analytique (UMR CNRS No 7575), II, rue Pierre et Marie Curie, 75005 Paris, France. E-mail: draye@ext.jussieu.fr; cote@ext.jussieuJr ... Micellar enhanced ultrafiltration (MEUF) ...
... 117, Washington, DC: American Chemical Society. 5. Cooper, EL, Hass, MK and Mattie, JF 1995. ... more ... 117, Washington, DC: American Chemical Society. 5. Cooper, EL, Hass, MK and Mattie, JF 1995. Appl. Radiat. ... 16. Cahill, R., Shpeizer, B., Peng, GZ, Bortum, L. and Clearfield, A. 1995. Separation of Elements Edited by: Nash, KL and Choppin, GR 165–176. ...
Journal of Radioanalytical and Nuclear Chemistry, 1993
The radiolytic products of the DCH18C6 obtained after γ-irradiation have been determined, and the... more The radiolytic products of the DCH18C6 obtained after γ-irradiation have been determined, and the seven main structures have been separated and analyzed. The radiolytic product yields range from about 0.01 to nearly 0.3 molecules per 100 eV absorbed by the DCH18C6 at an energy of 3290 kGy. From the viewpoint of radiation decomposition rate, the DCH18C6 presents a considerable resistance and its radiolytic products have little or no extraction power.
Recent progress in organic chemistry increases the possibility of controlling metal ions/organic ... more Recent progress in organic chemistry increases the possibility of controlling metal ions/organic molecules interaction. The use of macrocycles or polypodands (1) makes possible the creation of specific extractants for each metal ion. According to the actual needs in pollution elimination and precious metal recovery, this approach can lead to important renewals of extractants used in hydrometallurgy. In the present work,
International Journal of Mass Spectrometry and Ion Processes, 1996
The extraction efficiency of ion exchange resins aimed at the reprocessing of nuclear effluents i... more The extraction efficiency of ion exchange resins aimed at the reprocessing of nuclear effluents is strongly dependent on gamma-ray induced modifications of their chemical structure. A poly(4-vinylpyridine) resin, or P4VP, has been subjected to gamma irradiation using a 137Cs source (Eγ = 662 keV) and we have attempted to characterize its structural modifications using TOF-SIMS techniques based on low (keV)
The cis-syn-cis isomer of dicyclohexano-18-crown-6 (DCH18C6) has been shown to be an efficient ex... more The cis-syn-cis isomer of dicyclohexano-18-crown-6 (DCH18C6) has been shown to be an efficient extractant able to perform the separation of Pu(IV) and U(VI) from fission products and then the separation of Pu(IV) from U(VI) without valence exchange as required in the PUREX ...
A process combining liquid–liquid extraction with ion exchange for strontium traces removal in th... more A process combining liquid–liquid extraction with ion exchange for strontium traces removal in the presence of an excess of sodium concentrations is described. In this continuous process, strontium is extracted from acidic (0.9 M) solution using a substoichiometric amount of dicyclohexano-18-crown-6 (0.1 M in CHCl3). Extracted strontium is readily stripped from an organic phase with water and concentrated onto an
A new procedure for the concentration of uranium, dissolved in seawater with extremely low concen... more A new procedure for the concentration of uranium, dissolved in seawater with extremely low concentration, was studied. Plate module membrane filtration equipment was operated to evaluate the performance and selectivity of four different nanofiltration flat sheet membranes. ...
Journal of Radioanalytical and Nuclear Chemistry, 1997
Thiamacrocycles-synergized sulfonic acid extraction systems have been studied for removing traces... more Thiamacrocycles-synergized sulfonic acid extraction systems have been studied for removing traces of palladium from nitric acid solutions. The influence of the concentration of nitric acid, HDNNS, and thiamacrocycle were studied. Then different thiamacrocycles, with various cavity size and with or without substituent were evaluated. Influences on the extraction and stripping behavior is discussed.
The nuclear fuel reprocessing currently used generates liquid wastes with a significant level of ... more The nuclear fuel reprocessing currently used generates liquid wastes with a significant level of radioactivity that requires expensive and specific treatments. Therefore, in this study, an attempt has been made to develop another process that is more effective and produces less-active wastes by using a poly(4-vinylpyridine) resin as selective material for fixation of metal ions present at trace level, in
2Ecole Nationale Superieure de Chimie de Paris, Laboratoire d'Electrochirnie et de Chimie An... more 2Ecole Nationale Superieure de Chimie de Paris, Laboratoire d'Electrochirnie et de Chimie Analytique (UMR CNRS No 7575), II, rue Pierre et Marie Curie, 75005 Paris, France. E-mail: draye@ext.jussieu.fr; cote@ext.jussieuJr ... Micellar enhanced ultrafiltration (MEUF) ...
... 117, Washington, DC: American Chemical Society. 5. Cooper, EL, Hass, MK and Mattie, JF 1995. ... more ... 117, Washington, DC: American Chemical Society. 5. Cooper, EL, Hass, MK and Mattie, JF 1995. Appl. Radiat. ... 16. Cahill, R., Shpeizer, B., Peng, GZ, Bortum, L. and Clearfield, A. 1995. Separation of Elements Edited by: Nash, KL and Choppin, GR 165–176. ...
Journal of Radioanalytical and Nuclear Chemistry, 1993
The radiolytic products of the DCH18C6 obtained after γ-irradiation have been determined, and the... more The radiolytic products of the DCH18C6 obtained after γ-irradiation have been determined, and the seven main structures have been separated and analyzed. The radiolytic product yields range from about 0.01 to nearly 0.3 molecules per 100 eV absorbed by the DCH18C6 at an energy of 3290 kGy. From the viewpoint of radiation decomposition rate, the DCH18C6 presents a considerable resistance and its radiolytic products have little or no extraction power.
Recent progress in organic chemistry increases the possibility of controlling metal ions/organic ... more Recent progress in organic chemistry increases the possibility of controlling metal ions/organic molecules interaction. The use of macrocycles or polypodands (1) makes possible the creation of specific extractants for each metal ion. According to the actual needs in pollution elimination and precious metal recovery, this approach can lead to important renewals of extractants used in hydrometallurgy. In the present work,
International Journal of Mass Spectrometry and Ion Processes, 1996
The extraction efficiency of ion exchange resins aimed at the reprocessing of nuclear effluents i... more The extraction efficiency of ion exchange resins aimed at the reprocessing of nuclear effluents is strongly dependent on gamma-ray induced modifications of their chemical structure. A poly(4-vinylpyridine) resin, or P4VP, has been subjected to gamma irradiation using a 137Cs source (Eγ = 662 keV) and we have attempted to characterize its structural modifications using TOF-SIMS techniques based on low (keV)
The cis-syn-cis isomer of dicyclohexano-18-crown-6 (DCH18C6) has been shown to be an efficient ex... more The cis-syn-cis isomer of dicyclohexano-18-crown-6 (DCH18C6) has been shown to be an efficient extractant able to perform the separation of Pu(IV) and U(VI) from fission products and then the separation of Pu(IV) from U(VI) without valence exchange as required in the PUREX ...
A process combining liquid–liquid extraction with ion exchange for strontium traces removal in th... more A process combining liquid–liquid extraction with ion exchange for strontium traces removal in the presence of an excess of sodium concentrations is described. In this continuous process, strontium is extracted from acidic (0.9 M) solution using a substoichiometric amount of dicyclohexano-18-crown-6 (0.1 M in CHCl3). Extracted strontium is readily stripped from an organic phase with water and concentrated onto an
A new procedure for the concentration of uranium, dissolved in seawater with extremely low concen... more A new procedure for the concentration of uranium, dissolved in seawater with extremely low concentration, was studied. Plate module membrane filtration equipment was operated to evaluate the performance and selectivity of four different nanofiltration flat sheet membranes. ...
Journal of Radioanalytical and Nuclear Chemistry, 1997
Thiamacrocycles-synergized sulfonic acid extraction systems have been studied for removing traces... more Thiamacrocycles-synergized sulfonic acid extraction systems have been studied for removing traces of palladium from nitric acid solutions. The influence of the concentration of nitric acid, HDNNS, and thiamacrocycle were studied. Then different thiamacrocycles, with various cavity size and with or without substituent were evaluated. Influences on the extraction and stripping behavior is discussed.
The nuclear fuel reprocessing currently used generates liquid wastes with a significant level of ... more The nuclear fuel reprocessing currently used generates liquid wastes with a significant level of radioactivity that requires expensive and specific treatments. Therefore, in this study, an attempt has been made to develop another process that is more effective and produces less-active wastes by using a poly(4-vinylpyridine) resin as selective material for fixation of metal ions present at trace level, in
Uploads