Electrochemical recycling of Pd and Ag from simulated high-level liquid waste

You bin WANG, Rui ZOU, Yue zhou WEI, Tsuyoshi ARAI, Toyohisa FUJITA

Research output: Contribution to journalArticlepeer-review

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.

Original languageEnglish
Pages (from-to)1031-1040
Number of pages10
JournalTransactions of Nonferrous Metals Society of China
Volume32
Issue number3
DOIs
Publication statusPublished - 2022 Mar

Keywords

  • electrodeposition
  • metals recovery
  • morphology characteristics
  • nitrite generation
  • promoting effect

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Geotechnical Engineering and Engineering Geology
  • Metals and Alloys
  • Materials Chemistry

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