Sorption behavior of nickel and palladium in the presence of NH $_{3}$ (aq)/NH $_{4}$ $^{+}$

Kobayashi, Taishi*; Sasaki, Takayuki*; Ueda, Kenyo*; Kitamura, Akira

For the nuclear waste management of TRU waste, it is necessary to assess the impact of nitrate salts contained in the waste. In the present study, the sorption behavior of Ni and Pd on the pumice tuff was investigated in the presence of NH $_{3}$ (aq)/NH $_{4}$ $^{+}$ . Under different NH $_{3}$ (aq)/NH $_{4}$ $^{+}$ concentration, pH and ionic strength conditions, distribution coefficient ( $K_{rm d}$ ) of Ni and Pd on the pumice tuff was determined by batch experiment. For Ni system, the $K_{rm d}$ values showed no significant dependence on the initial NH $_{4}$ $^{+}$ concentration in neutral pH region, agrees with the prediction from thermodynamic data. For Pd system, the $K_{rm d}$ values decreased with an increase of [NH $_{4}$ $^{+}$ ]ini, suggesting the formation of stable ammine complex (Pd(NH $_{3}$ ) $_{m}$ $^{2+}$ (: 1 - 4)). The obtained $K_{rm d}$ values for Ni and Pd were analyzed using the surface complexation model. By taking complexes predicted by thermodynamic data into account, the sorption behavior of Ni and Pd in the presence of NH $_{3}$ (aq)/NH $_{4}$ $^{+}$ were well explained.

Language	:	English
Journal	:	Materials Research Society Symposium Proceedings, Vol.1518
Volume	:
Number	:
Pages	:	p.231 - 236
Publication Year/Month	:	2013/10
Meeting title	:	Materials Research Society 2012 Fall Meeting
Held date	:	2012/11
Location (city)	:	Boston
Location (country)	:	U.S.A.
Patent information	:
PDF	:
Paper URL	:	https://doi.org/10.1557/opl.2013.74
DOI for research data	:
Keywords	:	no keyword
Research Facility	:
Press Release	:
Article of JAEA R&D Review	:
Cooperating Institute	:	京都大学

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Registration No. : BB20122799
JAEA Abstracts No. : 48000883
Paper Submission No. : 23160

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Sorption behavior of nickel and palladium in the presence of NH(aq)/NH

Sorption behavior of nickel and palladium in the presence of NH $_{3}$ (aq)/NH $_{4}$ $^{+}$