Sorption Behavior and Morphology of Plutonium in the Presence of Goethite at 25 and 80C

Zavarin, M. ; Zhao, P. ; Dai, Z. ; Carroll, S. A. ; Kersting, A. B.

Lawrence Livermore National Laboratory

关键词: 38 Radiation Chemistry, Radiochemistry, And Nuclear Chemistry;    Stability;    Sorption;    Morphology;    Goethite;   

DOI  :  10.2172/1046119
RP-ID  :  LLNL-TR-561456
RP-ID  :  W-7405-ENG-48
RP-ID  :  1046119

美国|英语

来源: UNT Digital Library

【 摘 要 】

In this study, we examined the sorption behavior of Pu at elevated temperatures in the presence of one relevant mineral, goethite ({alpha}-FeOOH), over a range of concentrations that span solubility-controlled to adsorption-controlled concentrations. We focused on the sorptive behavior of two common forms of Pu: aqueous Pu(IV) and intrinsic Pu(IV) nano-colloids at 25 and 80 C in a dilute pH 8 NaCl/NaHCO{sub 3} solution. The morphology of Pu sorbed to goethite was characterized using transmission electron microscopy (TEM). We examined the relative stability of PuO{sub 2} precipitates, PuO{sub 2} nano-colloids, Pu{sub 4}O{sub 7} surface precipitates, and monomeric sorbed Pu as a function of temperature and over a time scale of months.