K. Rama Swami
Homi Bhabha National Institute
MicelleActinideNuclear chemistryDynamic light scatteringAqueous two-phase systemFourier transform infrared spectroscopyInorganic chemistryAqueous solutionChemistryMetal ions in aqueous solutionLanthanidePhosphoric acidThird phaseNitric acidAlkylSolventSpectroscopyPhase (matter)Extraction (chemistry)MetalRadiolysis
30Publications
7H-index
145Citations
Publications 17
Newest
#1T. Prathibha (RRC: Indira Gandhi Centre for Atomic Research)H-Index: 7
#2K. Rama Swami (RRC: Indira Gandhi Centre for Atomic Research)H-Index: 7
Last. K.A. Venkatesan (RRC: Indira Gandhi Centre for Atomic Research)
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Abstract null null Zirconium was identified as a troublesome fission product interfering with the separation of trivalent actinides from high-level liquid waste (HLLW) solution. Since zirconium was used as a fuel component in metallic fuels, the amount of Zr(IV) present in HLLW arising from reprocessing of metallic fuel was nearly ten times higher than the conventional HLLW solutions. In the present study, the diglycolamide extractants proposed for the separation of trivalent actinides from HLLW...
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#1K. Rama Swami (HBNI: Homi Bhabha National Institute)H-Index: 7
#2K.A. Venkatesan (HBNI: Homi Bhabha National Institute)
Last. Sk. Musharaf Ali (HBNI: Homi Bhabha National Institute)H-Index: 19
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Abstract The structure of diglycolamide (DGA) plays a vital role in the extraction of trivalent lanthanides and actinides from high-level nuclear waste. The radiolytic degradation of the solvent phase composed of DGAs in n-dodecane produces a range of alkanes differing in chain length and branching, and various other derivatives of DGA in organic phase, known as degradation products. However, the alkyl chain attached to the degraded DGA and n-dodecane degradation products determines the solubili...
2 CitationsSource
#1K. Rama Swami (HBNI: Homi Bhabha National Institute)H-Index: 7
#2K.A. Venkatesan (HBNI: Homi Bhabha National Institute)
Last. Radha V. Jayaram (Institute of Chemical Technology)H-Index: 32
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Abstract The limit of reverse micellar aggregation of amphiphilic ligands in n-dodecane medium, known as the third phase formation, is an undesirable event during the course of solvent extraction. The tetraalkyl diglycolamide (DGA) in n-dodecane (n-DD) is a promising solvent medium for the extraction of trivalent actinides from high-level nuclear waste, but it is susceptible to third phase formation. The DGAs in n-dodecane medium undergo a number of chemical transformations in organic phase, kno...
1 CitationsSource
#1N. Parvathy (HBNI: Homi Bhabha National Institute)
#2K. Rama Swami (HBNI: Homi Bhabha National Institute)H-Index: 7
Last. K.A. Venkatesan (HBNI: Homi Bhabha National Institute)
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Abstract The solvent phase composed of tetraoctyl diglycolamide (TODGA) in n-dodecane (n-DD) undergoes the undesirable organic phase splitting during the solvent extraction of trivalent actinides and lanthanides from nitric acid medium. To overcome this limitation a neutral extractant namely the N,N-dioctyl hydroxyacetamide (DOHyA), which was half the molecule of TODGA, has been added to the solvent phase and evaluated for the extraction of Nd (III) from nitric acid medium. Since the reverse mic...
3 CitationsSource
#1Parvathy Narayanan (HBNI: Homi Bhabha National Institute)
#2K. Rama Swami (HBNI: Homi Bhabha National Institute)H-Index: 7
Last. K. A. Venkatesan (HBNI: Homi Bhabha National Institute)H-Index: 26
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Abstract Fourier Transform Infra Red (FTIR) spectroscopy is an excellent tool for probing the co-ordination chemistry of the solvent extracted metal complexes in organic phase. The organic phase containing tetraoctyldiglycolamide (TODGA) and N,N-dioctylhydroxyacetamide (DOHyA) ligands dissolved n-dodecane was employed for the extraction of Nd(III) from nitric acid medium. The extracted organic phase was probed by FTIR spectroscopy to understand the coordination chemistry and aggregation behaviou...
3 CitationsSource
#1K. Rama SwamiH-Index: 7
#2K.A. Venkatesan (RRC: Indira Gandhi Centre for Atomic Research)
Last. B. Robert SelvanH-Index: 7
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The organic phase containing tetra(2-ethylhexy)diglycolamide (TEHDGA) and n-dodecane (n-DD) was irradiated to various absorbed dose levels in a 60Co gamma irradiation chamber. The organic phase subjected to irradiation was classified in to four different categories. The extraction behavior of Nd(III) from nitric acid was studied in the degraded solution of 0.2 M TEHDGA/n-DD and the reverse micellar aggregation behavior of the extracted phase was probed by dynamic light scattering technique and A...
1 CitationsSource
#1T. Prathibha (RRC: Indira Gandhi Centre for Atomic Research)H-Index: 7
#2K. Rama Swami (HBNI: Homi Bhabha National Institute)H-Index: 7
Last. K.A. Venkatesan (RRC: Indira Gandhi Centre for Atomic Research)
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3 CitationsSource
#1K. Rama Swami (RRC: Indira Gandhi Centre for Atomic Research)H-Index: 7
#2K.A. Venkatesan (RRC: Indira Gandhi Centre for Atomic Research)
Last. M. P. Antony (RRC: Indira Gandhi Centre for Atomic Research)H-Index: 16
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ABSTRACTDiglycolamides have been proposed for partitioning of trivalent actinides from high-level liquid waste (HLLW). Third-phase formation is an undesirable event during the course of solvent ext...
9 CitationsSource
#1K. Rama Swami (HBNI: Homi Bhabha National Institute)H-Index: 7
#2K.A. Venkatesan (RRC: Indira Gandhi Centre for Atomic Research)
To understand the role of pKa of the organophsophorus acidic extractant on the reverse micellar aggregation behavior of the binary solution containing tetra-(2-ethylhexyl)diglycolamide (TEHDGA) + acidic extractant in n-dodecane, the extraction behavior of nitric acid and Nd(III) in the binary solution was studied. The acidic extractants chosen were bis(2,4,4-trimethylpentyl)phosphinic acid (CYANEX-272), bis(2-ethylhexyl)phosphonic acid (PC88A) and bis(2-ethylhexyl)phosphoric acid (HDEHP). The re...
3 CitationsSource
#1K. Rama Swami (HBNI: Homi Bhabha National Institute)H-Index: 7
#2K.A. Venkatesan (HBNI: Homi Bhabha National Institute)
Abstract Tetra-bis(2-ethylhexyl)diglycolamide (TEHDGA) alone in n-dodecane (n-DD) is unsuitable for the solvent extraction of trivalent actinides from high-level liquid waste due to the occurrence of third phase formation during the course of solvent extraction. Significant concentration of long chain aliphatic alcohols ranging from 5% to 15% (V/V) have been added to the solvent phase, TEHDGA/n-DD, to control the undesirable third phase formation. The alcohols investigated were n-octanol, n-deca...
8 CitationsSource