中国有色金属学报(英文版)
Transactions of Nonferrous Metals Society of China
| Vol. 32 No. 3 March 2022 |
（1. School of Resources, Environment and Materials, Guangxi University, Nanning 530004, China;
2. Guangxi Key Laboratory of Processing for Non-ferrous Metal and Featured Materials, Guangxi University, Nanning 530004, China;
3. Department of Material Science and Engineering, Shibaura Institute of Technology, Tokyo 3-9-14, Japan）
Abstract:For the recycling of Pd and Ag from high-level liquid waste (HLLW), the electrochemical behaviors of Pd and Ag in the simulated HNO3 solutions were investigated by cyclic voltammetry and potentiostatic deposition.Scanning electron microscopy (SEM) and X-ray diffraction (XRD) were used to observe the deposits morphology and to evaluate their composition. The results indicate that the formation of NO2- helps to dissolve Ag while Ag is electrodeposited. When Pd and Ag are electrodeposited together, more metals are gained in the same time, and the deposited Ag does not dissolve in this situation.The metals are electrodeposited completely at the potentials from-0.4 to-0.6 V (vs MSE)and the deposits contain Ag and PdHx. The electrodeposition of Pd can boost hydrogen evolution, and then the reaction between H2 and NO2- is sped up, thereby lowering the concentration of NO2- and inhibiting the dissolution of Ag.
Key words: electrodeposition; metals recovery; nitrite generation; promoting effect; morphology characteristics
