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Multiplexed and Membraneless Redox-Mediated Electrochemical Separations Through Bipolar Electrochemistry
Nayeong Kim1, Kyle N Knust2, Xiao Su1
1Department of Chemical and Biomolecular Engineering, University of Illinois Urbana Champaign, 600 S Mathews Ave., Urbana, 61801, IL, USA.
Chemsuschem
|April 21, 2025
Summary
This study introduces a novel bipolar electrode strategy for simultaneous separation of multiple species using redox-active materials. The system demonstrates efficient arsenic removal, potassium recovery, and desalination from wastewater.
Area of Science:
- Electrochemistry
- Materials Science
- Environmental Engineering
Background:
- Redox-active electrosorbents offer selective separations but struggle with simultaneous multi-species extraction.
- Current binding mechanisms are often optimized for single-ion selectivity, limiting broader applications.
- Multiplexed separations are crucial for efficient resource recovery and contaminant removal from complex matrices like wastewater.
Purpose of the Study:
- To develop a novel strategy for multiplexed separations using bipolar electrochemistry.
- To demonstrate the simultaneous extraction of multiple species using a modular bipolar electrode (BPE) platform.
- To showcase the application of this technology for simultaneous potassium recovery, arsenic removal, and desalination from secondary wastewater.
Main Methods:
- Leveraging bipolar electrochemistry to create distinct electrochemical environments within a modular BPE platform.
- Utilizing polyvinyl ferrocene (PVF)-, Prussian blue analog (PBA)-functionalized, and carbon-based electrodes for separations.
- Employing a wireless, membraneless architecture for process-intensified electrosorption and regeneration.
Main Results:
- Demonstrated linear scalability of arsenic uptake with three identical PVF BPEs (41.4 to 115.4 mgAs gPVF-1).
- Achieved simultaneous recovery of potassium (11.0 mg g-1), removal of arsenic (19.8 mg g-1), and desalination (4.2 mg g-1) from secondary wastewater using distinct BPE pairs.
- Validated the real-world applicability of the multiplexed BPE system for simultaneous, multi-component separations.
Conclusions:
- The developed multiplexed BPE system enables parallel selective separations by controlling local electric fields on individual redox-active materials.
- This wireless, membraneless architecture facilitates process intensification for electrosorption and regeneration across diverse BPE systems.
- The strategy offers a promising platform for efficient and simultaneous recovery of valuable resources and removal of contaminants from wastewater.
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