title: Chromatographic separation of platinum group metals from simulated high level liquid waste using macroporous silica-based adsorbents.
abstract: To separate platinum group metals (PGMs) from high level liquid waste, three novel macroporous silica-based adsorbents, namely, (Crea+Dodec)/SiO2-P, (Crea+TOA)/SiO2-P and (MOTDGA+TOA)/SiO2-P, were synthesized by introducing extractants Crea (N',N'-di-n-hexyl-thiodiglycolamide), TOA (Tri-n-octylamine), MOTDGA (N,N'-dimethyl-N,N'-di-n-octyl-thiodiglycolamide) along with theirs modifier, Dodec (n-dodecyl alcohol), into 50μm diameter SiO2-P particles by impregnation. Chromatographic separation of PGMs from simulated high level liquid waste was investigated by column method. It was found that 100% of Pd(II) and Re(VII) could be eluted out from simulate HLLW in 3.0M HNO3 solution using three adsorbents. For Ru(III) and Rh(III), high temperature has distinct effect on the adsorption rate and a further study for Ru(III) and Rh(III) is necessary to separate them from HLLW completely. In all six column experiments, a relatively satisfactory chromatographic separation operating for PGMs from simulated HLLW was obtained using (Crea+TOA)/SiO2-P adsorbent packed column at 323K.
authors.affiliation: Cyclotron and Radioisotope Center, Tohoku University, Aoba 6-3, Aramaki, Aoba-ku, Sendai 980-8578, Japan.
authors.forename: Yuanlai
authors.initials: Y
authors.lastname: Xu
authors.forename: Seong-Yun
authors.initials: SY
authors.lastname: Kim
authors.forename: Tatsuya
authors.initials: T
authors.lastname: Ito
authors.forename: Haruki
authors.initials: H
authors.lastname: Tokuda
authors.forename: Keitaro
authors.initials: K
authors.lastname: Hitomi
authors.forename: Keizo
authors.initials: K
authors.lastname: Ishii
mesh_terms: D000327:Adsorption; D002846:Chromatography, Affinity / Q000379:methods*; D009678:Nuclear Energy; D010984:Platinum / Q000032:analysis / Q000737:chemistry / Q000302:isolation & purification*; D012822:Silicon Dioxide / Q000737:chemistry*; D062065:Wastewater / Q000737:chemistry*
chemical_list: D010984:Platinum; D012822:Silicon Dioxide; D062065:Wastewater
keywords: Extraction chromatography; High level liquid waste; Platinum group metals; Silica-based adsorbents