Electrochemical study and recovery of Pb using 1:2 choline chloride/urea deep eutectic solvent: A variety of Pb species PbSO4, PbO2, and PbO exhibits the analogous thermodynamic behavior

Yu Shun Liao, Po Yu Chen, I. Wen Sun

Research output: Contribution to journalArticle

14 Citations (Scopus)

Abstract

Water-insoluble PbSO4, PbO2, and PbO are fairly soluble in choline chloride/urea deep eutectic solvent (ChCl/urea DES) in 1:2 molar ratio. Very interestingly, solution prepared from PbO2 exhibits the almost identical electrochemical behavior as those from PbSO4 and PbO, indicating that Pb(II) is formed in the DES regardless of what Pb compound is introduced. The electrochemical reduction of the Pb(II) species is determined as an irreversible process, and involves the three-dimensional (3D) instantaneous nucleation with diffusion-controlled growth. From the dependence of the diffusion coefficient on temperature, the activation energy for diffusion of PbSO4 and PbO2 is determined to be 33.7 and 34.1 kJ mol−1, respectively. Electrodeposition of Pb was achieved potentiostatically and galvanostatically. The surface morphology of Pb deposits significantly depends on the applied potential and current. The coulombic efficiency of Pb electrodeposition is higher than 90%. Electrodeposition of Pb from a wet DES containing a mixture of three different Pb sources is also investigated. The XRD analysis confirmed that the electrodeposits consisted of metallic Pb.

Original languageEnglish
Pages (from-to)265-275
Number of pages11
JournalElectrochimica Acta
Volume214
DOIs
Publication statusPublished - 2016 Oct 1

All Science Journal Classification (ASJC) codes

  • Chemical Engineering(all)
  • Electrochemistry

Fingerprint Dive into the research topics of 'Electrochemical study and recovery of Pb using 1:2 choline chloride/urea deep eutectic solvent: A variety of Pb species PbSO<sub>4</sub>, PbO<sub>2</sub>, and PbO exhibits the analogous thermodynamic behavior'. Together they form a unique fingerprint.

Cite this