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

Journal Article · · Chemical Engineering Journal
 [1];  [2];  [1];  [2];  [1]
  1. Korea Advanced Inst. Science and Technology (KAIST), Daejeon (South Korea)
  2. Univ. of Illinois at Urbana-Champaign, IL (United States)

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.

Research Organization:
Univ. of Illinois at Urbana-Champaign, IL (United States)
Sponsoring Organization:
USDOE Office of Science (SC); National Research Foundation of Korea (NRF)
Grant/Contract Number:
SC0021409; 2019M2A7A1001773
OSTI ID:
1976917
Journal Information:
Chemical Engineering Journal, Vol. 421, Issue P1; ISSN 1385-8947
Publisher:
ElsevierCopyright Statement
Country of Publication:
United States
Language:
English

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