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Ishikawa, Jun; Ito, Hiroto; Maruyama, Yu
Proceedings of 23rd International Conference on Nuclear Engineering (ICONE-23) (DVD-ROM), 6 Pages, 2015/05
Nagasaki, Shinya*
JNC TJ8400 2000-004, 32 Pages, 2000/02
Equilibrium and kinetics of sorption of NpO on illite were investigated at pH = 6 by using the differential pulse anodic stripping voltammetry method and the spectroscopic method, respectively. It was found that the sorption isotherm obtained was fitted better by the Langmuir-Freundlich type equation than by the Langmuir equation. The heterogeneity coefficient was 0.89 0.05 and the half width at half maximum (HWHM) of affinity spectrum was 0.19 log unit, indicating that the surfacc of illite used has a low degree of heterogeneity. The kinetic spectra indicated that the sorption of NpO occurs only at the outer surfacc. The mean HWHM of the kinetic spectra was 0.18 log unit. This also proves that the sorption kinetics of NpO on the illite used is controlled by the same heterogeneity of the sorption sites. From the dependence of mean rate constants on temperature, a mean apparent activation enthalpy and a mean apparent activation entropy were evaluated at 373 kJ/mol and - 69 7 J/Kmol, respectively. This value of enthalpy suggests that the sorption is not controlled by diffusion through the hydrodynamic film around the illite. Equilibrium and kinetics of sorption of NpO and Np(V) carbonate complexes (mainly NpOCO) on Na-montmorillonite were also examined by using same technique.
; Usuda, Shigekazu; Maeda, Atsushi
Proc. of 7th Int. Conf. on Radioactive Waste Management and Environmental Remediation (ICEM'99)(CD-ROM), 3 Pages, 1999/00
no abstracts in English
Sugihara, Yoichiro*; Mukai, Katsuyuki*; Nunomiya, Ichiro*
PNC TJ6357 97-001, 40 Pages, 1997/03
None
Enoeda, Mikio; Kawamura, Yoshinori; Okuno, Kenji; Tanaka, Kenichi*; Uetake, Mitsuru*; Nishikawa, Masabumi*
Fusion Technology, 28(3), p.591 - 596, 1995/10
no abstracts in English
Nakashima, Mikio; Tachikawa, Enzo
Journal of Nuclear Science and Technology, 19(7), p.571 - 577, 1982/00
Times Cited Count:16 Percentile:81.94(Nuclear Science & Technology)no abstracts in English