Adsorption properties and behavior of the platinum group metals onto a silica-based (Crea + TOA)/SiO2-P adsorbent from simulated high level liquid waste of PUREX reprocessing

Yuanlai Xu, Seong Yun Kim, Tatsuya Ito, Tsutomu Tada, Keitaro Hitomi, Keizo Ishii

Research output: Contribution to journalArticle

14 Citations (Scopus)

Abstract

To separate platinum group metals (PGMs) from high level liquid waste (HLLW), a novel silica-based (Crea + TOA)/SiO2-P adsorbent was synthesized by impregnating Crea (N′,N′-di-n-hexyl- thiodiglycolamide) and TOA (trioctylamine) two extractants into the macroporous SiO2-P support with a mean diameter of 60 μm. Adsorption properties and behavior of PGMs from simulated HLLW onto the novel silica-based (Crea + TOA)/SiO2-P adsorbent were investigated by batch method. It was found that (Crea + TOA)/SiO2-P adsorbent exhibited good adsorption selectivity for PGMs over the other tested fission product element in a wide HNO3 concentration. This adsorbent showed strong affinity to Pd(II) but almost no adsorption for rare earth elements. Adsorption process of PGMs could be expressed by Langmuir monomolecular layer adsorption mode and be governed by the chemisorption process. In addition, the adsorption isotherms and thermodynamic parameters of tested elements were calculated by Langmuir equation, Freundlich equation and van't Hoff equation, respectively.

Original languageEnglish
Pages (from-to)41-48
Number of pages8
JournalJournal of Radioanalytical and Nuclear Chemistry
Volume297
Issue number1
DOIs
Publication statusPublished - 2013 Jul 1

Keywords

  • (Crea + TOA)/SiO-P adsorbent
  • Extraction chromatography
  • High level liquid waste
  • Platinum group metals

ASJC Scopus subject areas

  • Analytical Chemistry
  • Nuclear Energy and Engineering
  • Radiology Nuclear Medicine and imaging
  • Pollution
  • Spectroscopy
  • Public Health, Environmental and Occupational Health
  • Health, Toxicology and Mutagenesis

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