[3I05-07] Nuclide Adsorption and Separation 2

[3I05] Electrochemical boosting the uptake performance of Prussian blue for Platinum group elements

(1) Experimental demonstration

Koki Watanabe¹, Masato Nakaya¹, Yasutaka Kitagawa², *Jun Onoe¹ (1. Nagoya University, 2. Osaka University)

Keywords:Prussian blue film, Rhodium, Electrochemistry, redox, uptake performance

Platinum group metals (PGMs) and molybdenum (Mo) contained in high-level radioactive liquid waste cause serious problems in the vitrification process (joule heating failure, glass flowability deterioration, and clogging). We have found that Prussian blue (PB) and its analogues (PBA) exhibit higher uptake performances for PGMs and Mo than other sorbents (activated carbon and zeolite). However, we also found that it takes a long time, about one month, to achieve sorption equilibrium. In this talk, we demonstrate that the uptake performance for Rh is improved by more than one order of magnitude by redox control of the PB thin film electrochemically, which is due to accelerate the diffusion of Rh ion that is the rate-limiting factor.