Synthesis of two novel macroporous silica-based impregnated polymeric composites and their application in highly active liquid waste partitioning by extraction chromatography

Two kinds of novel macroporous silica-based chelating polymeric adsorption materials, TODGA/SiO 2-P and CMPO/SiO 2-P, were synthesized by impregnating and immobilizing two chelating agents, N, N, N′, N′-tetraoctyl-3-oxapentane-1,5-diamide (TODGA) and octyl(phenyl)- N, N-diisobutylcarbamoylmethylphos...

Ausführliche Beschreibung

Gespeichert in:
Bibliographische Detailangaben
Veröffentlicht in:Journal of Chromatography A 2004-12, Vol.1061 (2), p.175-182
Hauptverfasser: Zhang, Anyun, Kuraoka, Etsusyo, Hoshi, Harutaka, Kumagai, Mikio
Format: Artikel
Sprache:eng
Schlagworte:
Online-Zugang:Volltext
Tags: Tag hinzufügen
Keine Tags, Fügen Sie den ersten Tag hinzu!
Beschreibung
Zusammenfassung:Two kinds of novel macroporous silica-based chelating polymeric adsorption materials, TODGA/SiO 2-P and CMPO/SiO 2-P, were synthesized by impregnating and immobilizing two chelating agents, N, N, N′, N′-tetraoctyl-3-oxapentane-1,5-diamide (TODGA) and octyl(phenyl)- N, N-diisobutylcarbamoylmethylphoshine oxide (CMPO), into the pores of SiO 2-P particles. To separate minor actinides (MA(III)) such as Am(III) and Cm(III), the adsorption and elution of 13 typically simulated fission products from a 3 M HNO 3 were performed. It was found that in the first column packed with TODGA/SiO 2-P, all of the simulated elements were separated effectively into four groups: (1) Cs(I), Mo(VI), and the most portion of Ru(III) (non-adsorption group), (2) Sr(II), small portion of Gd(III) and all of light REs(III) (MA– lRE–Sr group), (3) most of Gd(III) and all heavy RE(III) ( hRE group), and (4) Zr(IV), Pd(II), and a little of Ru(III) (Zr–Pd group) by eluting with 3.0 M HNO 3, 1.0 M HNO 3, distilled water, and 0.5 M H 2C 2O 4, respectively, at 298 K. MA(III) was predicted to flow into the second group along with Nd(III) because of their close adsorption-elution onto TODGA/SiO 2-P. In the second column packed with CMPO/SiO 2-P, MA– lRE–Sr group was separated into (1) Sr(II), (2) middle RE(III) such as Gd(III), Eu(III), Sm(III), and quite small portion of Nd(III) (MA– mRE), and (3) light RE(III) such as La(III), Ce(III), and most of Nd(III) by eluting with 3.0 M HNO 3 and 0.05 M DTPA-pH 2.0, respectively, at 323 K. MA(III) was believed to flow into MA– mRE group along with Gd(III) due to their similar adsorption properties towards CMPO/SiO 2-P. Based on positions of MA(III) appeared in light and heavy RE(III), an improved MAREC process for MA(III) partitioning from HLW was proposed.
ISSN:0021-9673
DOI:10.1016/j.chroma.2004.11.023