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Principles Of Fluorescence Spectroscopy

Selectivity of ion exchange membranes: A review

Chemistry of Diglycolamides: Promising Extractants for Actinide Partitioning

Review on hydrometallurgical recovery of rare earth metals

Complexation and Extraction of Trivalent Actinides and Lanthanides by Triazinylpyridine N-Donor Ligands

Evaluation of polymer inclusion membranes containing crown ethers for selective cesium separation from nuclear waste solution.

Abstract Separation of trivalent actinide (An) and lanthanide (Ln) elements is one of the burning topics in the back end of the nuclear fuel cycle due to the similarity in their chemical behaviour. A significant amount of research is being carried out worldwide to develop suitable ligands for the separation of the trivalent actinides and lanthanides. Some of the research groups are engaged in continuous improvement of the di-ethylene-triamine-penta acetic acid (DTPA) based Ln/An separation method, whereas extensive research is going on for the development of the lipophilic and hydrophilic ‘N’ donor heteropolycyclic ligands as the actinide selective ligand. A number of ‘S’ donor ligands are also explored for the Ln/An separation. In the present review, we made an attempt to highlight various separation processes based on soft donor ligands developed for Ln/An separations. Beside the conventional solvent extraction processes, separation possibilities membrane based and solid phase extraction techniques are evaluated for the Ln/An separation and are compiled in the present review.

Separation of trivalent actinides and lanthanides using various ‘N’, ‘S’ and mixed ‘N,O’ donor ligands: a review

Separation behavior of Am3+ and Eu3+ was studied from aqueous nitrate medium using the “soft‐donor” Cyanex‐301 (bis(2,4,4‐trimethylpentyl) dithiophosphinic acid) in toluene as the extractant. The separation factor (S.F.=DAm/DEu) value of 5000 (obtained with pure Cyanex‐301) increased about eight times when a binary mixture of Cyanex‐301 and N‐donor ligands (such as 2,2′‐bipyridyl (bipy) or 1,10‐phenanthroline (phen)) was used as the extractant. The S.F. values of >40,000 are the highest reported to date. Nitrate ion played an important role in the separation behavior of the trivalent lanthanide and actinide ions. The extracted species, established by the slope analysis method, are Am(A)3 · Bo and Eu(A)2(X) · Bo, respectively where A=deprotonated form of Cyanex‐301, B=phen or bipy and X=NO3 −.

Separation of Americium(III) and Europium(III) from Nitrate Medium Using a Binary Mixture of Cyanex‐301 with N‐donor Ligands

Evaluation of calix-crown ionophores for selective separation of radio-cesium from acidic nuclear waste solution.

The separation of trivalent actinides and lanthanides is a challenging task for chemists because of their similar charge and chemical behavior. Soft donor ligands like Cyanex-301 were found to be selective for the trivalent actinides over the lanthanides. Formation of different extractable species for Am3+ and various lanthanides (viz. La3+, Eu3+, and Lu3+) was explained on the basis of their relative stabilities as compared to their corresponding trinitrato complexes calculated using the density functional method. Further, the metal−ligand complexation energy was segregated into electrostatic, Pauli repulsion, and orbital interaction components. Higher covalence in the M−S bond in the dithiophosphinate complexes as compared to the M−O bond in the nitrate complexes was reflected in the higher orbital and lower electrostatic interactions for the complexes with increasing number of dithiophosphinate ligands. Higher affinity of the dithiophosphinate ligands for Am3+ over Eu3+ was corroborated with higher cov...

Selective americium(III) complexation by dithiophosphinates: a density functional theoretical validation for covalent interactions responsible for unusual separation behavior from trivalent lanthanides.

Arunasis Bhattacharyya

Papers

Evaluation of polymer inclusion membranes containing crown ethers for selective cesium separation from nuclear waste solution.

Separation of trivalent actinides and lanthanides using various ‘N’, ‘S’ and mixed ‘N,O’ donor ligands: a review

Separation of Americium(III) and Europium(III) from Nitrate Medium Using a Binary Mixture of Cyanex‐301 with N‐donor Ligands

Evaluation of calix-crown ionophores for selective separation of radio-cesium from acidic nuclear waste solution.

Selective americium(III) complexation by dithiophosphinates: a density functional theoretical validation for covalent interactions responsible for unusual separation behavior from trivalent lanthanides.