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Ion selectivity in capacitive deionization with functionalized electrode: Theory and experimental validation.

Diego I Oyarzun1, Ali Hemmatifar1, James W Palko2

  • 1Department of Mechanical Engineering, Stanford University Stanford, CA 94305, USA.

Water Research X
|June 14, 2019
PubMed
Summary
This summary is machine-generated.

This study introduces inverted capacitive deionization (i-CDI) using functionalized carbon to selectively remove nitrate ions from water. This method offers a chemical-free regeneration process, achieving significant nitrate reduction for safer drinking water.

Keywords:
Capacitive deionizationIon selectivityNitrateSurface chargeSurfactant treatment

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Area of Science:

  • Environmental Science
  • Materials Science
  • Electrochemistry

Background:

  • Capacitive deionization (CDI) is explored for selective ion removal.
  • Conventional ion exchange resins require harsh chemicals for regeneration.

Purpose of the Study:

  • To develop a selective nitrate removal method using functionalized activated carbon in an inverted CDI (i-CDI) system.
  • To investigate the selectivity of nitrate over chloride ions and optimize regeneration conditions.
  • To demonstrate a practical i-CDI process for reducing nitrate levels in drinking water.

Main Methods:

  • Activated carbon was functionalized with quaternary amines surfactant.
  • An inverted capacitive deionization (i-CDI) cell was operated with a constant regeneration voltage.
  • Nitrate and chloride ion selectivity was measured under varying conditions.
  • A dynamic, multi-species electrosorption and equilibrium model was developed and validated.

Main Results:

  • Demonstrated up to 6.5-fold observable selectivity for nitrate over chloride ions at 0.4 V regeneration voltage.
  • Achieved significant nitrate reduction from ~170 ppm to below 50 ppm (drinking water limit).
  • Developed and validated a predictive model for electrosorption and chemical reactions.

Conclusions:

  • Functionalized activated carbon in i-CDI offers a promising, chemical-free approach for selective nitrate removal.
  • The i-CDI system shows high nitrate selectivity at low regeneration voltages.
  • This technology has potential for producing safe drinking water by reducing nitrate contamination.