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Related Concept Videos

Ion-Exchange Chromatography01:09

Ion-Exchange Chromatography

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Ion-exchange chromatography, or IEC, is a technique for separating ions based on their affinity for the stationary phase. The stationary phase is a cross-linked polymer resin with covalently attached ionic functional groups. The functional groups can be either positively charged (cation exchangers) or negatively charged (anion exchangers). A cation exchanger consists of a polymeric anion and active cations, while an anion exchanger is a polymeric cation with active anions. The choice of...
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Capillary Electrophoresis: Instrumentation01:20

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Capillary electrophoresis instrumentation typically consists of several key components. A high-voltage power supply generates the electric field necessary for the separation by connecting to an anode (the positively charged electrode) and a cathode (the negatively charged electrode) located in buffer reservoirs at each end of the capillary tube. The system includes a sample vial, a fused silica capillary tube coated with polyimide for mechanical strength through which the sample components...
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Interfacial Electrochemical Methods: Overview01:06

Interfacial Electrochemical Methods: Overview

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Interfacial electrochemical methods focus on the phenomena occurring at the boundary between an electrode and a solution, as opposed to bulk methods that concentrate on the solution's overall properties. These interfacial methods are classified as either static or dynamic based on the presence of a nonzero current in the electrochemical cell and the consistency of analyte concentrations. Static methods, such as potentiometry, measure the cell's potential without any significant current...
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Precipitation and Co-precipitation01:17

Precipitation and Co-precipitation

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Precipitation and coprecipitation methods can be used to separate a mixture of ions in a solution. In qualitative inorganic analysis, ions that form sparingly soluble precipitates with the same reagent are separated based on the differences in solubility products. For example, consider the separation of Cu(II) and Fe(II) ions by precipitation as insoluble sulfides. First, copper(II) sulfide is precipitated by the addition of acidic H2S, where the dissociation of H2S is suppressed. Adding H2S...
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Capillary Electrophoresis: Applications01:30

Capillary Electrophoresis: Applications

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Capillary electrophoretic separations offer various modes, each with unique applications. These modes include capillary zone electrophoresis, capillary gel electrophoresis, capillary array electrophoresis, capillary isoelectric focusing, capillary isotachophoresis, micellar electrokinetic chromatography, and capillary electrochromatography.
Capillary zone electrophoresis (CZE) separates ionic components based on their electrophoretic mobility. It has been used to separate proteins, amino acids,...
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Dialysis01:15

Dialysis

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Dialysis is a diffusion-based purification process that separates analyte molecules from a complex matrix. This is accomplished by allowing molecules in the solution to pass through a semipermeable membrane into a liquid on the other side. The membrane is usually made of cellulose acetate or cellulose nitrate, and the second liquid must be miscible with the solution. Ions (e.g., chloride or sodium) or organic molecules (e.g., glucose) can pass through the membrane pores, which generally have...
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Updated: Dec 13, 2025

Ion-Exchange Membranes for the Fabrication of Reverse Electrodialysis Device
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Process design tools and techno-economic analysis for capacitive deionization.

Tristan D Hasseler1, Ashwin Ramachandran1, William A Tarpeh2

  • 1Department of Aeronautics & Astronautics, Stanford University, Stanford, CA, 94305, United States.

Water Research
|August 1, 2020
PubMed
Summary
This summary is machine-generated.

A new, free MATLAB tool enables detailed simulation and techno-economic analysis of capacitive deionization (CDI) systems for efficient water desalination. This open-source software aids in optimizing CDI performance and cost assessments.

Keywords:
Capacitive deionizationElectrode agingProcess design toolTechno-economic analysisVariable flowWater desalination

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Area of Science:

  • Environmental Engineering
  • Electrochemical Engineering
  • Water Treatment Technologies

Background:

  • Capacitive deionization (CDI) is a promising technology for water desalination using porous electrodes.
  • Accurate modeling of CDI systems is crucial for understanding salt removal, water recovery, and energy dynamics.
  • Techno-economic analysis requires robust methods to evaluate system costs against water production.

Purpose of the Study:

  • To develop and present a novel, free MATLAB-based modeling and analysis tool for Capacitive Deionization (CDI) systems.
  • To enable direct numerical simulation of CDI dynamics and calculation of key performance and cost parameters.
  • To facilitate drag-and-drop design and integration with periphery blocks like energy sources and cost streams.

Main Methods:

  • Development of an installable MATLAB program utilizing open-source Simulink models.
  • Implementation of validated well-mixed reactor formulations and non-linear circuit models.
  • Inclusion of a graphical user interface (GUI) for parameter specification, simulation control, and results visualization.
  • Integration of techno-economic models for converting physical streams into economic estimates.

Main Results:

  • The tool allows for simulation of arbitrary current and flow rate forcing for multiple CDI cells.
  • It accommodates various electric double-layer sub-models, enhancing simulation accuracy.
  • Batch-mode simulations and plotting capabilities are provided for comprehensive analysis.
  • The software enables calculation of economic estimates, including levelized water costs.

Conclusions:

  • The developed MATLAB tool provides a comprehensive solution for CDI system modeling and techno-economic assessment.
  • Its user-friendly interface and open-source nature promote wider adoption and research in CDI technology.
  • This tool can significantly aid in optimizing CDI plant design, operation, and cost-effectiveness for water desalination.