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Ion Exchange01:17

Ion Exchange

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Ion exchange chromatography separates charged molecules from a solution by reversibly exchanging them with mobile, or 'active', ions associated with the oppositely charged stationary phase. This method can be used to separate ions, soften and deionize water, and purify solutions. The polymers comprising the ion-exchange column are high-molecular-weight and chemically stable polymers, crosslinked to be porous and essentially insoluble. They are also functionalized with either acidic or...
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The presence of a dielectric medium in a capacitor not only changes the voltage and capacitance but also affects the electric field. In general, dielectrics can be of two types: polar and nonpolar. In a polar dielectric, the positive and negative charges in the molecules are separated by a distance and hence have a permanent dipole moment. In contrast, no such charge separation exists in a nonpolar dielectric, however the nonpolar molecules get polarized in the presence of an external electric...
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A Metal-Oxide-Semiconductor (MOS) capacitor is a fundamental structure used extensively in semiconductor device technology, particularly in the fabrication of integrated circuits and MOSFETs (metal-oxide-semiconductor field-effect transistors). The MOS capacitor consists of three layers: a metal gate, a dielectric oxide, and a semiconductor substrate.
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Tetrahedral Complexes
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Tunnel-Structured ζ-V2O5 as a Redox-Active Insertion Host for Hybrid Capacitive Deionization.

Nicholas I Cool1,2, Randall James1, Parker Schofield1,2

  • 1Department of Chemistry, Texas A&M University, College Station, Texas 77843-3012, United States.

ACS Applied Materials & Interfaces
|December 21, 2022
PubMed
Summary

This study introduces a novel hybrid capacitive deionization cell using tunnel-structured vanadium oxide (ζ-V2O5) electrodes. This method enhances ion removal capacity and selectivity for valuable ions like lithium from produced water waste.

Keywords:
desalinationdirect lithium extractionhybrid capacitive deionizationion capturemetastable polymorphsproduced waterresource recoveryvanadium oxides

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Environmental Engineering

Background:

  • High salinity in global water sources limits usability for consumption and agriculture.
  • Produced water from enhanced oil recovery presents a significant waste stream with high mineral content.
  • Conventional deionization methods are energy-intensive and lack ion selectivity.

Purpose of the Study:

  • To develop an efficient hybrid capacitive deionization (CDI) system for desalination and resource recovery.
  • To investigate the performance of tunnel-structured ζ-V2O5 as a positive electrode material in a hybrid CDI cell.
  • To assess the selectivity and capacity for removing specific ions, particularly Li+ and K+, from complex water streams.

Main Methods:

  • Construction of a hybrid capacitive deionization cell utilizing ζ-V2O5 as the positive electrode.
  • Integration of Faradaic insertion processes with surface adsorption for enhanced ion removal.
  • Comparative analysis of ζ-V2O5 electrodes against high-surface-area carbon electrodes.
  • Investigation of ion removal kinetics influenced by hydration free energy and solid-state diffusion.

Main Results:

  • A 50% increase in ion removal capacity for K+ and Li+ was achieved compared to carbon electrodes.
  • Extracted ions were effectively stored within the tunnel framework of ζ-V2O5.
  • ζ-V2O5 electrodes demonstrated high selectivity for Li+ removal from mixed ion streams.
  • Concentration of Li-ions from produced water waste was successfully achieved.

Conclusions:

  • Hybrid capacitive deionization with ζ-V2O5 offers a promising approach for efficient desalination and valuable ion recovery.
  • The unique tunnel structure of ζ-V2O5 facilitates enhanced ion adsorption and insertion.
  • This technology has the potential to address water scarcity and support resource recovery from industrial wastewater.