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Journal Articles

Separation of minor actinides and lanthanides from nitric acid solution by R-BTP extraction resin

Hoshi, Harutaka*; Wei, Y.*; Kumagai, Mikio*; Asakura, Toshihide; Morita, Yasuji

Recent Advances in Actinide Science, p.596 - 598, 2006/06

Recently, extraction selectivity for trivalent minor actinides (MA = Am and Cm) over lanthanides (Ln) has been found in some extractants containing soft donor, such as S or N, ligands. Kolarik et al. reported that a new N-donor ligand 2,6-bis(5,6-dialkyl-1,2,4-triazine-3-yl)-pyridine (R-BTP) shows high selectivity for MA (III) over Ln(III) [1]. However, protonation of R-BTP results in its acidic hydrolysis in acidic medium. Stability in acidic solution was improved by substitution of long normal chain or branched chain [2]. In this work, separation of MA(III) and Ln(III) from nitric acid solution was studied by using novel R-BTP impregnated resin. Branched R-BTP resin had high affinity for Am from up to 4 M HNO$$_{3}$$ solution and its distribution coefficient was over 10$$^{4}$$.

Journal Articles

Separation of trivalent actinides from lanthanides by using R-BTP resins and stability of R-BTP resin

Hoshi, Harutaka*; Wei, Y.*; Kumagai, Mikio*; Asakura, Toshihide; Morita, Yasuji

Journal of Alloys and Compounds, 408-412, p.1274 - 1277, 2006/02

 Times Cited Count:37 Percentile:13.42(Chemistry, Physical)

For the development of advanced aqueous reprocessing system, it is one of the most important subjects to separate minor trivalent actinides (MA = Am and Cm). Recently, extraction selectivity for MA(III) over Ln(III) has been found in some extractants containing soft donor, such as S or N, ligands. Kolarik et al. reported that a new N-donor ligand 2,6-bis(5,6-dialkyl-1,2,4-triazine-3-yl)-pyridine (R-BTP) shows high selectivity for MA (III) over Ln(III). The novel silica-based extraction resins were prepared by impregnating some R-BTP molecules into a macroreticular styrene-divinylbenzene copolymer which is immobilized in porous silica particles with a mean diameter of 50 $$mu$$m. Separation of simulated high level liquid waste solution containing Ln(III) and trace amount of Am(III) was studied. Am(III) was mutually separated from Ln(III) through a packed column with R-BTP impregnating resin, very high decontamination factor ($$>$$ 10$$^{7}$$) for Am, and all the elements were recovered quantitatively.

Journal Articles

$$^{151}$$Eu-M$"o$ssbauer spectroscopic and X-ray diffraction study of the Eu$$_{2}$$(Ce$$_{1-x}$$Zr$$_{x}$$)$$_{2}$$O$$_{7}$$ and LnEuZr$$_{2}$$O$$_{7}$$(Ln=lanthanide) systems

Masaki, Nobuyuki; Nakamura, Akio; Furuuchi, Fumihito*; Hinatsu, Yukio*

Journal of Physics and Chemistry of Solids, 66(2-4), p.312 - 317, 2005/02

 Times Cited Count:8 Percentile:60.85(Chemistry, Multidisciplinary)

no abstracts in English

JAEA Reports

None

*

JNC-TN1400 2000-003, 0 Pages, 2000/07

JNC-TN1400-2000-003.pdf:13.33MB

None

JAEA Reports

None

; Koyama, Tomozo; Funasaka, Hideyuki

JNC-TN8400 99-021, 34 Pages, 1999/03

JNC-TN8400-99-021.pdf:1.27MB

None

Journal Articles

Back-extraction of tri- and tetravalent actinides from Di(2-ethylhexyl)phosphoric acid (HDEHP) with hydrozine carbonate

Watanabe, Masayuki; Morita, Yasuji; Kubota, Masumitsu*; Tatsugae, Ryozo*

Radiochimica Acta, 87(3-4), p.115 - 119, 1999/00

no abstracts in English

Journal Articles

Absorption/desorption of lanthanides on metal oxides interfaces

*; Nagasaki, Shinya*; *; Tanaka, Satoru*; Suzuki, Atsuyuki*; Tanaka, Tadao; Muraoka, Susumu

Radiochimica Acta, 82, p.239 - 242, 1998/00

no abstracts in English

JAEA Reports

None

Wada, Yukio; *; ; *

PNC-TY8607 97-002, 158 Pages, 1997/05

PNC-TY8607-97-002.pdf:3.2MB

no abstracts in English

JAEA Reports

None

; Koyama, Tomozo; ; ;

PNC-TN8410 97-120, 59 Pages, 1997/03

PNC-TN8410-97-120.pdf:2.0MB

None

JAEA Reports

PNC Technical Review No.101

PNC-TN1340 97-001, 154 Pages, 1997/03

PNC-TN1340-97-001.pdf:21.55MB

no abstracts in English

JAEA Reports

None

*

PNC-TJ8603 97-003, 29 Pages, 1997/03

PNC-TJ8603-97-003.pdf:1.51MB

no abstracts in English

JAEA Reports

None

*; Nagasaki, Shinya*

PNC-TJ1602 97-001, 57 Pages, 1997/03

PNC-TJ1602-97-001.pdf:1.2MB

None

JAEA Reports

Study of lanthanide (III) nitrate complexes in CMPO/TBP systems by nuclear magnetic resonance (II)

Sano, Yuichi; *; *; *; Koyama, Tomozo;

PNC-TN8410 96-362, 19 Pages, 1996/10

PNC-TN8410-96-362.pdf:2.22MB

The coordination properties of the lanthanide (La, Ce, Pr, Nd, Sm and Eu) complexes in lanthanide/TBP (tributylphosphate), lanthanide/CMPO (octyl(phenyl)-N,N-diisobutycarbamoylmethylphosphine oxide) and lanthanide/CMPO/TBP systems were investigated by NMR (nuclear magnetic resonance) measurements. In the lanthanide/CMPO/TBP system, it is shown that the structure of lanthanide complex is changed by the concentration ratio for added CMPO to the lanthanide ion ; lanthanide/CMPO/TBP system ([CMPO]/[Ln] $$<$$ 3 (mole ratio)) NO$$_{3}$$ - the similar coordination in the Ln/TBP system TBP, CMPO - These coordinate to the lanthanide ion together. (the existence of several complexes) lanthanide/CMPO/TBP system ([CMPO]/[Ln} $$>$$ 3(mole ratio)) NO$$_{3}$$ - the same coordination in the Ln/CMPO system TBP, CMPO - Only CMPO coordinates to the lanthanide ion. TBP doesn't exist within the first coordination sphere, but affects the CMPO exchange reaction.

JAEA Reports

None

; ; Nomura, Kazunori; Koyama, Tomozo; *;

PNC-TN8410 96-258, 46 Pages, 1996/09

PNC-TN8410-96-258.pdf:1.9MB

None

JAEA Reports

Spectroscopic calculation code ASPECT and its application

*; Wakaida, Ikuo

JAERI-Data/Code 96-017, 62 Pages, 1996/03

JAERI-Data-Code-96-017.pdf:1.89MB

no abstracts in English

JAEA Reports

None

; ;

PNC-TN8420 95-022, 228 Pages, 1995/10

PNC-TN8420-95-022.pdf:7.59MB

None

JAEA Reports

Study of lanthanide(III) nitrate complexes in CMPO/TBP systems by nuclear magnetie resonance

; Aose, Shinichi; ;

PNC-TN8410 95-313, 20 Pages, 1995/10

PNC-TN8410-95-313.pdf:1.25MB

THe coordination properties of the lanthanide (La, Ce, Pr, Nd, Sm and Eu) complexes in lanthanide/TBP (tributylphosphate), lanthanide/CMPO (octyl(phenyl)-N, N-diisobutylcarbamoylmethylphosphine oxide) and lanthanide/CMPO/TBP systems were investigated by the NMR (nuclear magnetic resonance) measurements. The numbers of the coordinated CMPO and TBP to the lanthanide ion were estimated about three and two in the lanthanide/CMPO and lanthanide/TBP systems, respectively. It is considered that TBP and CMPO coordinate to the lanthanide (III) ion in the monodentate and the bidentate manners, respectively. In the lanthanide/CMPO/TBP system, $$^{31}$$P-NMR spectra suggested that CMPO coordinates to lanthanide(III) ion directly in the bidentate mode, but TBP doesn't exist within the first coordination sphere and coordinates to the lanthanide(III) ion from beyond the first coordination sphere. The activation parameters for the ligand exchange reactions calculated by the CBS (complete bandshape) method suggest that the ligand exchange reactions in the lanthanide (Pr and Eu)/TBP and lanthanide (La, Pr and Sm)/CMPO systems proceed through either the associative (A) mechanism or the dissociative (D) mechanism with an ordering into the second coordination sphere. In the lanthanide (Pr and Sm)/CMPO/TBP systems, it was shown that the CMPO exchange reactions proceed through the mechanism with an ordering into the second coordination sphere, which is caused by TBP in the systems.

Journal Articles

Extraction separation of tervalent Americium and lanthanides in the presence of some soft and hard donors and dicarbollide

J.Rais*; Tachimori, Shoichi

Sep. Sci. Technol., 29(10), p.1347 - 1365, 1994/00

 Times Cited Count:45 Percentile:9.18(Chemistry, Multidisciplinary)

no abstracts in English

JAEA Reports

None

Kato, Masato*

PNC-TN8410 90-079, 32 Pages, 1990/08

PNC-TN8410-90-079.pdf:0.58MB

None

Journal Articles

Solvent extraction behaviours of the lanthanides in perchloric acid; Tri-$$n$$-butyl phosphate system

Journal of Inorganic and Nuclear Chemistry, 26, p.619 - 625, 1964/00

 Times Cited Count:15

no abstracts in English

26 (Records 1-20 displayed on this page)