Palladium Recovery through Membrane Capacitive Deionization from Metal Plating Wastewater

David Inhyuk Kim, Gimun Gwak, Pema Dorji, Di He, Sherub Phuntsho, Seungkwan Hong, Hokyong Shon

Research output: Contribution to journalArticle

16 Citations (Scopus)

Abstract

The potential application of membrane capacitive deionization (MCDI) for recovery of palladium (Pd) ions from catalyst solution wastewater generated from the plating industry was investigated in this study. Several major issues were explored in this work to verify the suitability of MCDI for Pd recovery from a practical perspective: adsorption and desorption efficiencies, desorption mechanisms into high concentration of Pd concentrate, and its sustainability in long-term operation. The lab-scale MCDI operation achieved satisfactory and highly competitive Pd removal (99.07-99.94% removal with 1.42-1.52 of Pd selectivity over ammonium ions) showing that Pd can be effectively collected from plating industry wastewater. A high concentration of Pd concentrate (64.77 and 919.44 mg/L of Pd from the 10 and 100 mg/L Pd containing catalyst solution, respectively) was obtained through successive five operation cycles of adsorption/desorption phases. However, it is significant to note that the desorption efficiency was inversely proportional to the concentration of Pd concentrate which is likely due to the Pd ions discharged from carbon electrode toward Pd solution against the enhanced concentration gradient. The long-term operation results suggest that scaling could reduce the MCDI efficiency during Pd recovery (0.17% decrease in Pd removal for every cycle on average) and hence may require an adequate electrode cleaning regime.

Original languageEnglish
Pages (from-to)1692-1701
Number of pages10
JournalACS Sustainable Chemistry and Engineering
Volume6
Issue number2
DOIs
Publication statusPublished - 2018 Feb 5

Keywords

  • Electrosorption
  • Ion desorption
  • Membrane capacitive deionization (MCDI)
  • Palladium concentration
  • Wastewater from plating industry

ASJC Scopus subject areas

  • Chemistry(all)
  • Environmental Chemistry
  • Chemical Engineering(all)
  • Renewable Energy, Sustainability and the Environment

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