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Method and apparatus for capacitive deionization and electrochemical purification and regeneration of electrodes

Patent ·
OSTI ID:874086
 [1];  [2];  [3]
  1. Livermore, CA
  2. Tracy, CA
  3. Manteca, CA
+ Show Author Affiliations
An electrically regeneratable electrochemical cell (30) for capacitive deionization and electrochemical purification and regeneration of electrodes includes two end plates (31, 32), one at each end of the cell (30). A new regeneration method is applied to the cell (30) which includes slowing or stopping the purification cycle, electrically desorbing contaminants and removing the desorbed contaminants. The cell (30) further includes a plurality of generally identical double-sided intermediate electrodes (37-43) that are equidistally separated from each other, between the two end electrodes (35, 36). As the electrolyte enters the cell, it flows through a continuous open serpentine channel (65-71) defined by the electrodes, substantially parallel to the surfaces of the electrodes. By polarizing the cell (30), ions are removed from the electrolyte and are held in the electric double layers formed at the carbon aerogel surfaces of the electrodes. The cell (30) is regenerated electrically to desorb such previously removed ions.
Research Organization:
Lawrence Livermore National Laboratory (LLNL), Livermore, CA
DOE Contract Number:
W-7405-ENG-48
Assignee:
Regents of the University of California (Oakland, CA)
Patent Number(s):
US 6309532
OSTI ID:
874086
Country of Publication:
United States
Language:
English

References (5)

Capacitive deionization of NH4ClO4 solutions with carbon aerogel electrodes journal October 1996
Continuous Quantitative Electrolysis. journal June 1964
Electrosorption of Chromium Ions on Carbon Aerogel Electrodes as a Means of Remediating Ground Water journal March 1997
Modified graphites for chelation and ion exchange journal December 1978
Electrochromatography—a preliminary study of the effect of applied potential on a carbonaceous chromatographic column journal January 1984

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