Studies on separation of platinum group metals from high-level liquid waste using sulfur-containing amide compounds fixed adsorbents

Tatsuya Ito, Naoki Osawa, Haruka Oosugi, Seong Yun Kim

Research output: Contribution to conferencePaper

Abstract

We have developed two macroporous silica-based adsorbents with fixed sulfur-containing diamide-type extractants for the separation of platinum group metals (PGMs) from high-level liquid waste (HLLW) via extraction chromatography. Fresh N,N-di-n-octylthiodiglycolamic acid (DOTDGAA) and N,N,N',N'-tetra-n-hexyl-3,6-dithiaoctane-1,8-diamide (THDTODA) were prepared to improve their availability to Ru(III) and increase their affinity for Rh(III). DOTDGAA was readily synthesized from thiodiglycolic anhydride and di-noctylamine. (DOTDGAA-tri-n-octylamine [TOA])/SiO2-P and (THDTODA-TOA)/SiO2-P were prepared by impregnating a macroporous silica-polymer composite support (SiO2-P) with TOA and either DOTDGAA or THDTODA. A solution with a composition similar to that of HLLW was prepared by dissolving several PGMs in 2 M HNO3. Each adsorbent was then evaluated for its ability to adsorb the PGMs. The properties of the adsorbents were compared with those of (MOTDGA-TOA)/SiO2-P, which contained fixed N,N'-dimethyl-N,N'di-n-octyl-thiodiglycolamide extractant (MOTDGA), and (Crea-TOA)/SiO2-P, which contained fixed N,N'dimethyl-N,N'-di-n-hexyl-thiodiglycolamide extractant (Crea). All four adsorbents were capable of PGM adsorption and had high affinities for Pd(II). (THDTODA-TOA)/SiO2-P had higher affinities for Ru(III) and Rh(III) than (MOTDGA-TOA)/SiO2-P, (Crea-TOA)/SiO2-P, or (DOTDGAA-TOA)/SiO2-P. However, (Crea-TOA)/SiO2-P exhibited the highest Ru(III) and Rh(III) adsorption rates among the four adsorbents.

Original languageEnglish
Pages474-480
Number of pages7
Publication statusPublished - 2020 Jan 1
Event14th International Nuclear Fuel Cycle Conference, GLOBAL 2019 and Light Water Reactor Fuel Performance Conference, TOP FUEL 2019 - Seattle, United States
Duration: 2019 Sep 222019 Sep 27

Conference

Conference14th International Nuclear Fuel Cycle Conference, GLOBAL 2019 and Light Water Reactor Fuel Performance Conference, TOP FUEL 2019
CountryUnited States
CitySeattle
Period19/9/2219/9/27

ASJC Scopus subject areas

  • Fuel Technology
  • Nuclear Energy and Engineering

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    Ito, T., Osawa, N., Oosugi, H., & Kim, S. Y. (2020). Studies on separation of platinum group metals from high-level liquid waste using sulfur-containing amide compounds fixed adsorbents. 474-480. Paper presented at 14th International Nuclear Fuel Cycle Conference, GLOBAL 2019 and Light Water Reactor Fuel Performance Conference, TOP FUEL 2019, Seattle, United States.