Effects of γ-ray Irradiation on Thiodiglycolamide-type Extractant-impregnated Adsorbents for Separation of Platinum Group Metals from High-level Liquid Waste

Tatsuya Ito, Seong Yun Kim, Nobumichi Nagano, Keitaro Hitomi

Research output: Contribution to journalConference articlepeer-review

3 Citations (Scopus)

Abstract

To estimate the applicability of thiodiglycolamide-type extractant-impregnated adsorbents to separation of the platinum group metals (PGMs) from high-level liquid waste, radiation effects on the adsorption behavior of PGMs onto a macroporous silica-based (Crea-TOA)/SiO2-P absorbent and on the stability of the adsorbent were investigated by using γ-rays emitted from 60Co, and the results were compared with those obtained using (MOTDGA-TOA)/SiO2-P. A difference in adsorption behaviors of PGMs onto the two adsorbents was not observed with or without irradiation up to 100 kGy of the absorbed dose. Decomposition of the impregnated extractants and degradation of the adsorption capability increased with increasing absorbed dose, but the distribution coefficient of Pd remained >102 up to approximately 250 kGy. The retention ratio of loaded PGMs gradually decreased with increasing absorbed dose. From these results, the adsorbents were considered to be useful for the adsorption of PGMs irrespective of whether the adsorption system was irradiated, except for when the adsorbent was irradiated by a very large dose.

Original languageEnglish
Pages (from-to)195-202
Number of pages8
JournalEnergy Procedia
Volume131
DOIs
Publication statusPublished - 2017
Event5th International Symposium on Innovative Nuclear Energy Systems, INES-5 2016 - Tokyo, Japan
Duration: 2017 Oct 312017 Nov 2

Keywords

  • Adsorption
  • Macroporous silica-based adsorbent
  • Platinum group metals
  • γ-ray irradiation

ASJC Scopus subject areas

  • Energy(all)

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