Jerzy Narbutt - Academia.edu (original) (raw)

Papers by Jerzy Narbutt

Journal of Radioanalytical and Nuclear Chemistry Letters, 1992

Czechoslovak Journal of Physics, 2006

The separation by solvent extraction of 241 Am(III) from 152 Eu(III), in 1 M NaNO 3 weakly acidic... more The separation by solvent extraction of 241 Am(III) from 152 Eu(III), in 1 M NaNO 3 weakly acidic (pH 4) aqueous solutions, into dilute (ca. 10-2 M) solutions of triazinylbipyridine derivatives (diethylhemi-BTP or di(benzyloxyphenyl)hemi-BTP) and chlorinated cobalt dicarbollide (COSAN) in 1-octanol or nitrobenzene has been studied. The N-tridentate heterocyclic ligands, which are selective for Am(III) over Eu(III), secured efficient separation of the two metal ions, while COSAN, strongly hydrophobic and fully dissociated in polar diluents, enhanced the extraction of the metal ions by ion-pair formation. Molecular interactions between the two co-extractants, observed at higher concentrations, led to the precipitation of their 1: 1 molecular adduct. In spite of that, efficient separations of Am and Eu ions were attained, with high separation factors, SF Am/Eu of 40 and even 60, provided the concentration of hemi-BTP was significantly greater than that of COSAN. Excess COSAN concentrations caused an antagonistic effect, decreasing both the distribution ratio of the metal ions and their separation factor.

Liquid-Phase Extraction, 2020

Abstract Reprocessing of spent nuclear fuel using solvent extraction technologies, leading to the... more Abstract Reprocessing of spent nuclear fuel using solvent extraction technologies, leading to the fully closed nuclear fuel cycle, has been reviewed. Supplementing current PUREX technologies (separation of uranium and plutonium) by separation of americium would enable the transmutation of all transuranic elements in fast-neutron reactors. This will significantly improve the efficiency of using the energy resources and drastically reduce the long-term threat of nuclear waste to people and the environment. Novel americium-selective extractants and stripping agents are presented, as well as the new separation processes. Specific problems of solvent extraction of highly radioactive actinides and fission products are discussed, which resulted in radiolytic degradation of the solvents and disruption of the desired separations.

Liquid-Phase Extraction, 2020

Abstract Thermodynamic and to a lesser extent kinetic problems of solvent extraction of metal ion... more Abstract Thermodynamic and to a lesser extent kinetic problems of solvent extraction of metal ions have been comprehensively discussed, with particular attention to the solute-solvent interactions in the aqueous and organic phases. The content of this review chapter has been presented in a more analytic than a descriptive way. The presentation is illustrated by the results of both early and recent research in this field, with particular emphasis on the contribution of the author and his collaborators.

Journal of Radioanalytical and Nuclear Chemistry Articles, 1986

Recent work directed towards synthesizing and exploring new effective sorbents for radiocesium re... more Recent work directed towards synthesizing and exploring new effective sorbents for radiocesium removal from primary coolants of pressurized water nuclear reactors of the WWER type is presented. Various sorbents synthesized on the basis of titanium hexacyanoferrate are compared with one another from the point of view of their sorption efficiency and stability. The uptake of137Cs from solutions containing boric acid

Radiochimica Acta, 2008

An intercomparison campaign was organized at the beginning of the European FP6 EUROPART Integrate... more An intercomparison campaign was organized at the beginning of the European FP6 EUROPART Integrated Project, among the partners involved in the assessment of the extracting properties of novel ligands, in order to check their accuracy and reliability when determining metal cation distribution ratios. Three different extracting systems, presenting various selectivity and affinity towards trivalent actinides were selected: (i) CMPO, (ii) TPTZ and (iii) BTP. Although some differences could be pointed out in the implementation of liquid–liquid extraction tests, the distribution ratios measured by the nine partners were fairly reproducible (<20% deviation) for the first two extracting systems. However, large discrepancies occurred when testing the third extracting system, due to its strong hydrolytic instability, thus pointing out the difficulty of assessing extraction properties of instable ligands.

A novel material, Apatite II, obtained from a natural source, has been determined to be a good ad... more A novel material, Apatite II, obtained from a natural source, has been determined to be a good adsorbent for radionuclides of strontium, europium and trivalent actinides, but not caesium, from neutral aqueous solutions containing common chelating agents and inorganic salts at moderate concentrations. This inexpensive, easily available material seems to be a promising backfill for engineered barriers in nuclear waste repositories. However, encapsulation of the sorbent grains loaded with radiostrontium in the Portland cement matrix results in undesirably high leaching rate for this particular radionuclide.

Index on Censorship, 1979

Annales Universitatis Mariae Curie-Sklodowska, sectio AA – Chemia

Recycling of actinides from spent nuclear fuel by their selective separation followed by transmut... more Recycling of actinides from spent nuclear fuel by their selective separation followed by transmutation in fast reactors will optimize the use of natural uranium resources and minimize the long-term hazard from high-level nuclear waste. This paper describes solvent extraction processes recently developed, aimed at the separation of americium from lanthanide fission products as well as from curium present in the waste. Depicted are novel poly-N-heterocyclic ligands used as selective extractants of actinide ions from nitric acid solutions or as actinide-selective hydrophilic stripping agents.

Solvent Extraction and Ion Exchange

Solvent Extraction and Ion Exchange

New Journal of Chemistry

Formation of heteroleptic complexes would explain a discrepancy between results from solvent extr... more Formation of heteroleptic complexes would explain a discrepancy between results from solvent extraction and from spectroscopy reported earlier.

Chemischer Informationsdienst

Nukleonika, 2016

It is with deep sorrow that we announce the death of a great scientist, Professor Gregory Robert ... more It is with deep sorrow that we announce the death of a great scientist, Professor Gregory Robert Choppin, the member of the Editorial Board of "Nukleonika". He passed away peacefully in Tallahassee (USA) in the presence of his wife Ann, their children and grandchildren, on October 21, 2015. After earning the Ph.D. degree in chemistry from the University of Texas in 1953, Greg Choppin became a research scientist at the Lawrence Radiation Laboratory, the University of California, Berkeley. Working under the supervision of Glenn Seaborg he became a co-discoverer of element 101, mendelevium. In 1956 Choppin joined the Chemistry Department at Florida State University (FSU), where he focused his research on the chemistry of rare earth elements and of the heaviest radioactive elements. He published 13 books and more than 300 research papers. Among others he co-authored four editions of "Radiochemistry and Nuclear Chemistry, Theory and Applications", and co-edited the second edition of "Principles and Practice of Solvent Extraction" (2004). Professor Choppin was a gifted lecturer. During his 45-year career at FSU (he retired in 2001), he mentored more than 100 Ph.D. students and postdoctoral research associates. FSU recognized him in 1967 with distinction as a Robert O. Lawton Distinguished Professor. Greg's achievements were recognized through numerous awards and honors, including honorary doctorates from

J Radioanal Nucl Chem, 1992

Journal of Inorganic and Nuclear Chemistry, 1981

Journal of Radioanalytical and Nuclear Chemistry Letters, 1992

Czechoslovak Journal of Physics, 2006

The separation by solvent extraction of 241 Am(III) from 152 Eu(III), in 1 M NaNO 3 weakly acidic... more The separation by solvent extraction of 241 Am(III) from 152 Eu(III), in 1 M NaNO 3 weakly acidic (pH 4) aqueous solutions, into dilute (ca. 10-2 M) solutions of triazinylbipyridine derivatives (diethylhemi-BTP or di(benzyloxyphenyl)hemi-BTP) and chlorinated cobalt dicarbollide (COSAN) in 1-octanol or nitrobenzene has been studied. The N-tridentate heterocyclic ligands, which are selective for Am(III) over Eu(III), secured efficient separation of the two metal ions, while COSAN, strongly hydrophobic and fully dissociated in polar diluents, enhanced the extraction of the metal ions by ion-pair formation. Molecular interactions between the two co-extractants, observed at higher concentrations, led to the precipitation of their 1: 1 molecular adduct. In spite of that, efficient separations of Am and Eu ions were attained, with high separation factors, SF Am/Eu of 40 and even 60, provided the concentration of hemi-BTP was significantly greater than that of COSAN. Excess COSAN concentrations caused an antagonistic effect, decreasing both the distribution ratio of the metal ions and their separation factor.

Liquid-Phase Extraction, 2020

Abstract Reprocessing of spent nuclear fuel using solvent extraction technologies, leading to the... more Abstract Reprocessing of spent nuclear fuel using solvent extraction technologies, leading to the fully closed nuclear fuel cycle, has been reviewed. Supplementing current PUREX technologies (separation of uranium and plutonium) by separation of americium would enable the transmutation of all transuranic elements in fast-neutron reactors. This will significantly improve the efficiency of using the energy resources and drastically reduce the long-term threat of nuclear waste to people and the environment. Novel americium-selective extractants and stripping agents are presented, as well as the new separation processes. Specific problems of solvent extraction of highly radioactive actinides and fission products are discussed, which resulted in radiolytic degradation of the solvents and disruption of the desired separations.

Liquid-Phase Extraction, 2020

Abstract Thermodynamic and to a lesser extent kinetic problems of solvent extraction of metal ion... more Abstract Thermodynamic and to a lesser extent kinetic problems of solvent extraction of metal ions have been comprehensively discussed, with particular attention to the solute-solvent interactions in the aqueous and organic phases. The content of this review chapter has been presented in a more analytic than a descriptive way. The presentation is illustrated by the results of both early and recent research in this field, with particular emphasis on the contribution of the author and his collaborators.

Journal of Radioanalytical and Nuclear Chemistry Articles, 1986

Recent work directed towards synthesizing and exploring new effective sorbents for radiocesium re... more Recent work directed towards synthesizing and exploring new effective sorbents for radiocesium removal from primary coolants of pressurized water nuclear reactors of the WWER type is presented. Various sorbents synthesized on the basis of titanium hexacyanoferrate are compared with one another from the point of view of their sorption efficiency and stability. The uptake of137Cs from solutions containing boric acid

Radiochimica Acta, 2008

An intercomparison campaign was organized at the beginning of the European FP6 EUROPART Integrate... more An intercomparison campaign was organized at the beginning of the European FP6 EUROPART Integrated Project, among the partners involved in the assessment of the extracting properties of novel ligands, in order to check their accuracy and reliability when determining metal cation distribution ratios. Three different extracting systems, presenting various selectivity and affinity towards trivalent actinides were selected: (i) CMPO, (ii) TPTZ and (iii) BTP. Although some differences could be pointed out in the implementation of liquid–liquid extraction tests, the distribution ratios measured by the nine partners were fairly reproducible (<20% deviation) for the first two extracting systems. However, large discrepancies occurred when testing the third extracting system, due to its strong hydrolytic instability, thus pointing out the difficulty of assessing extraction properties of instable ligands.

A novel material, Apatite II, obtained from a natural source, has been determined to be a good ad... more A novel material, Apatite II, obtained from a natural source, has been determined to be a good adsorbent for radionuclides of strontium, europium and trivalent actinides, but not caesium, from neutral aqueous solutions containing common chelating agents and inorganic salts at moderate concentrations. This inexpensive, easily available material seems to be a promising backfill for engineered barriers in nuclear waste repositories. However, encapsulation of the sorbent grains loaded with radiostrontium in the Portland cement matrix results in undesirably high leaching rate for this particular radionuclide.

Index on Censorship, 1979

Annales Universitatis Mariae Curie-Sklodowska, sectio AA – Chemia

Recycling of actinides from spent nuclear fuel by their selective separation followed by transmut... more Recycling of actinides from spent nuclear fuel by their selective separation followed by transmutation in fast reactors will optimize the use of natural uranium resources and minimize the long-term hazard from high-level nuclear waste. This paper describes solvent extraction processes recently developed, aimed at the separation of americium from lanthanide fission products as well as from curium present in the waste. Depicted are novel poly-N-heterocyclic ligands used as selective extractants of actinide ions from nitric acid solutions or as actinide-selective hydrophilic stripping agents.

Solvent Extraction and Ion Exchange

Solvent Extraction and Ion Exchange

New Journal of Chemistry

Formation of heteroleptic complexes would explain a discrepancy between results from solvent extr... more Formation of heteroleptic complexes would explain a discrepancy between results from solvent extraction and from spectroscopy reported earlier.

Chemischer Informationsdienst

Nukleonika, 2016

It is with deep sorrow that we announce the death of a great scientist, Professor Gregory Robert ... more It is with deep sorrow that we announce the death of a great scientist, Professor Gregory Robert Choppin, the member of the Editorial Board of "Nukleonika". He passed away peacefully in Tallahassee (USA) in the presence of his wife Ann, their children and grandchildren, on October 21, 2015. After earning the Ph.D. degree in chemistry from the University of Texas in 1953, Greg Choppin became a research scientist at the Lawrence Radiation Laboratory, the University of California, Berkeley. Working under the supervision of Glenn Seaborg he became a co-discoverer of element 101, mendelevium. In 1956 Choppin joined the Chemistry Department at Florida State University (FSU), where he focused his research on the chemistry of rare earth elements and of the heaviest radioactive elements. He published 13 books and more than 300 research papers. Among others he co-authored four editions of "Radiochemistry and Nuclear Chemistry, Theory and Applications", and co-edited the second edition of "Principles and Practice of Solvent Extraction" (2004). Professor Choppin was a gifted lecturer. During his 45-year career at FSU (he retired in 2001), he mentored more than 100 Ph.D. students and postdoctoral research associates. FSU recognized him in 1967 with distinction as a Robert O. Lawton Distinguished Professor. Greg's achievements were recognized through numerous awards and honors, including honorary doctorates from

J Radioanal Nucl Chem, 1992

Journal of Inorganic and Nuclear Chemistry, 1981