Abstract
The electrochemical behaviour and recovery of rhodium in an acidic solution were investigated using a rotating disc electrode system and a modified electrochemical cyclone cell, respectively. The electrochemical polarization data indicated that the Rh3+ ions were reduced to metallic Rh below −0.1 V, and the limiting current density for rhodium deposition was observed at around −0.3 V (vs. SCE) with a diffusion coefficient of 6.3 × 10−6 cm2 s−1 using the Levich equation. The effects of the applied voltage and the initial concentration of rhodium were examined using the modified cyclone cell, and more than 91 % of the rhodium in solution was recovered within 2 h under the optimal conditions.
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