Electrochemically-assisted removal of cadmium ions by redox active Cu-based metal-organic framework

Yonghwan Kim, Kwiyong Kim, Ho Hyeon Eom, Xiao Su, Jae W. Lee

Research output: Contribution to journalArticlepeer-review


An electrochemically-assisted wastewater treatment using Faradaic materials offers a promising technique for the selective removal of hazardous substances. Here, we demonstrate the reversible capture and release of cadmium ions in aqueous solutions, using a redox-active metal-organic framework (MOF) electrode. As-synthesized copper-based MOF (Cu-MOF-74; copper 2,5-dihydroxyterephthalate) is a highly attractive candidate for Faradaic electrosorption due to its large surface area, water stability, and redox-active metal nodes. Our work demonstrates the reversible capture and release of Cd2+ ions assisted by the electrochemical redox reaction of Cu2+/Cu+ within the MOF structure. Combined material characterization and electrosorption tests were carried out to determine the operational conditions for maximizing adsorption capacity, energy efficiency, and material stability, thus leading to excellent electrosorption (>100 mg g−1) and regeneration efficiency (>90%). This study demonstrates the feasibility of leveraging MOFs containing redox-active metal nodes for the selective separation of toxic cations, and paves the way for promising future applications of these 3-D porous structures for wastewater treatment and environmental remediation.

Original languageEnglish (US)
Article number129765
JournalChemical Engineering Journal
StatePublished - Oct 1 2021


  • Cadmium removal
  • Electrosorption
  • Metal-organic framework
  • Redox reaction
  • Stripping

ASJC Scopus subject areas

  • Chemistry(all)
  • Environmental Chemistry
  • Chemical Engineering(all)
  • Industrial and Manufacturing Engineering


Dive into the research topics of 'Electrochemically-assisted removal of cadmium ions by redox active Cu-based metal-organic framework'. Together they form a unique fingerprint.

Cite this