Sonochemistry of plutonium
Résumé
Sonochemistry (i.e., chemical reactions driven under power ultrasound) has attracted considerable
attention as a promising alternative in nuclear reprocessing due to the mild and efficient reaction
conditions it enables. The arising acoustic cavitation, (i.e., the nucleation, growth, and rapid implosive
collapse of gas and vapor-filled micro-bubbles) allows the in-situ generation of active species that can
react in solution and lead to redox interactions. In heterogeneous systems, this phenomenon goes with
strong physical effects such as erosion of surfaces, grain fractures, increase of mass transfer, and decrease
of diffusion layers. This presentation aims to summarize the investigations carried out in the topic of Pu
sonochemistry since 2010 at ICSM and At alante facilities in Marcoule. The talk will focus on (i) the
redox behavior of Pu(III), Pu(IV), Pu(V), and Pu(VI) ions in aqueous nitric solutions under ultrasound
irradiation, (ii) the ultrasound-assisted reductive dissolution of refractory PuO2, and (iii) the sonochemical
preparation of stable and salt-free nanometric Pu colloids (Figure 1). Related characterizations are
performed with UV-Vis absorption spectroscopy, SEM, HR-TEM, EXAFS and XANES.
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