T. G. Srinivasan

Indira Gandhi Centre for Atomic Research

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P. R. Vasudeva Rao

Homi Bhabha National Institute

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K. A. Venkatesan

Sri Ramakrishna Institute of Paramedical Sciences

N. Sivaraman

Indira Gandhi Centre for Atomic Research

M. P. Antony

Coventry University

K. N. Sabharwal

Indira Gandhi Centre for Atomic Research

Alok Rout

Indira Gandhi Centre for Atomic Research

Jammu Ravi

Indira Gandhi Centre for Atomic Research

C. V. S. Brahmmananda Rao

Indira Gandhi Centre for Atomic Research

K. Nagarajan

Indian Institute of Technology Kanpur

M. Jayakumar

Central Electrochemical Research Institute

Cooperative Institutions

Indira Gandhi Centre for Atomic Research

Homi Bhabha National Institute

Bhabha Atomic Research Centre

Indian Institute of Technology Madras

University of Mumbai

Institute of Chemical Technology

Bhabha Atomic Research Center Hospital

Lawrence Berkeley National Laboratory

Vellore Institute of Technology University

University of Padua

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Studies on the Extraction of Actinides by Substituted Butyl Phosphonates

Solvent Extraction and Ion Exchange (2012)

C. V. S. Brahmmananda Rao T. G. Srinivasan P. R. Vasudeva Rao

Abstract The extraction of actinides by homologs of dibutylalkyl phosphonates has been studied in detail. This study was taken up in order to understand the influence of the phosphorus-carbon bond in phosphonates on the extraction of actinides. In this context, dibutylhexyl phosphonate (DBHeP) and dibutyloctyl phosphonate (DBOP) were synthesized and characterized by various techniques. The physical properties of the two solvents and the extraction of nitric acid and actinides by these phosphonates were compared with those by dibutylbutyl phosphonate (DBBP). The physical properties such as density, viscosity, surface tension, refractive index, and solubility are reported here for the first time. Dispersion number, a dimensionless quantity that characterizes the ability of the solvent to separate from two-phase dispersion, is reported for all the three phosphonates. The extraction characteristics of actinides by these series of compounds are compared with those by tributyl phosphate (TBP). Keywords: Dibutylhexyl phosphonatedibutyloctyl phosphonatesolvent extractionactinidesthird phase formation

Phosphonate

Nitric acid

Tributyl phosphate

10.1080/07366299.2011.639250

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Citations (51)

Third phase formation of neodymium (III) and nitric acid in unsymmetrical N,N-di-2-ethylhexyl-N′,N′-dioctyldiglycolamide

Separation and Purification Technology (2011)

Jammu Ravi T. Prathibha K. A. Venkatesan M. P. Antony T. G. Srinivasan

Diluent

Nitric acid

Neodymium

Third phase

Dodecane

Aqueous two-phase system

10.1016/j.seppur.2011.09.053

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Citations (47)

Radiation stability of some room temperature ionic liquids

Radiation Physics and Chemistry (2011)

Ch. Jagadeeswara Rao K. A. Venkatesan B. V. R. Tata K. Nagarajan T. G. Srinivasan

Imide

10.1016/j.radphyschem.2011.01.012

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Citations (46)

Electrodeposition of metallic uranium at near ambient conditions from room temperature ionic liquid

Journal of Nuclear Materials (2010)

Ch. Jagadeeswara Rao K. A. Venkatesan K. Nagarajan T. G. Srinivasan P. R. Vasudeva Rao

Glassy carbon

10.1016/j.jnucmat.2010.10.022

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Citations (62)

Electrochemical behavior of rhodium(III) in 1-butyl-3-methylimidazolium chloride ionic liquid

Electrochimica Acta (2007)

M. Jayakumar K. A. Venkatesan T. G. Srinivasan

10.1016/j.electacta.2007.10.056

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Citations (29)

Studies on Bis Annulated Triazinyl Pyridine (BATP) using Extraction Chromatography

Separation Science and Technology (2013)

P. Deepika K. N. Sabharwal T. G. Srinivasan P. R. Vasudeva Rao

2,6-Bis(5,5,8,8-tetramethyl-5,6,7,8-tetrahydrobenzo[1,2,4]triazin-3-yl)pyridine (BATP) was synthesized and impregnated on XAD-7 resin and the extraction performance of this BATP/XAD-7 resin was investigated for the uptake of Am(III) and lanthanides from nitric acid media in batch experiments. The performance of the BATP/XAD-7 resin was compared with that of 2,6-bis(5,6-dipropyl-1,2,4-triazin-3-yl)pyridine (n-Pr-BTP) impregnated XAD-7. It was observed that BATP/XAD-7 displayed higher Am(III)/Eu(III) separation factors, better selectivity and faster kinetics for a much lower wt% loading of the extractant than n-Pr-BTP/XAD-7. Column experiments for the separation of Am(III) from lanthanides by extraction chromatography using BATP/XAD-7 gave good results; however, the loaded Am(III) was retained very strongly in the column and could not be eluted.

Nitric acid

10.1080/01496395.2013.788519

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Citations (9)

Tricyclohexylphosphate—A Unique Member in the Neutral Organophosphate Family

Solvent Extraction and Ion Exchange (2003)

C. V. S. Brahmmananda Rao Arumugam Suresh T. G. Srinivasan P. R. Vasudeva Rao

Abstract Tricyclohexylphosphate (TcyHP) was synthesised and characterized. The extraction of U(VI) and Th(IV) by TcyHP in n‐dodecane was studied and compared with tributylphosphate (TBP). The feasibility of the separation of Th and U with TcyHP has been explored and reported. The solubility of TcyHP in water at room temperature has been measured. The stoichiometry of the TcyHP solvates with Th(NO3)4 and UO2(NO3)2 was evaluated. The enthalpy of extraction of U(VI) by TcyHP was measured. The results of column runs with TcyHP impregnated Amberlite XAD‐7 resin for studying the loading and elution behavior of uranium from nitric acid medium are also reported in this paper. Hexavalent actinides form third phase with neutral organophosphate extractants only at very high nitric acid concentrations and high metal loading. However the presence of the three closed ring alkyl moieties in TcyHP is seen to lead to certain unique features with regard to the third phase formation behavior. It has been observed, for instance, that U(VI) forms third phase with this extractant even with highly polar diluents like 1‐chlorooctane. Further, the tendency for third phase formation with U(VI) is even higher than in the case of Th(IV), in contrast to the trend observed so far with other extractants.

Nitric acid

Diluent

Amberlite

Third phase

Stoichiometry

10.1081/sei-120018947

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Citations (20)

EXTRACTION OF U(VI), Pu(IV) AND Th(IV) BY SOME TRIALKYL PHOSPHATES

Solvent Extraction and Ion Exchange (1994)

Arumugam Suresh T. G. Srinivasan P. R. Vasudeva Rao

ABSTRACT This paper reports the data on the extraction of U(VI), Pu(IV) and Th(IV) from nitric acid by tri-isobutyl phosphate, tri-n-amyl phosphate, tri-isoamyl phosphate and tri-n-hexyl phosphate and provides a comparison of their extract ion behaviour with that of tri-n-butyl phosphate. Data on the third phase formation in the system Th(NO3) 4 −HNO3 −1.1 M trialkyl phosphate/n-dodecane are also presented.

Nitric acid

Tri-N-butyl Phosphate

Isoamyl acetate

10.1080/07366299408918234

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Citations (115)

Retention studies on uranium, thorium and lanthanides with amide modified reverse phase support and its applications

Journal of Chromatography A (2007)

Ch. Siva Kesava Raju M. S. Subramanian N. Sivaraman T. G. Srinivasan P. R. Vasudeva Rao

Amide

10.1016/j.chroma.2007.01.010

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