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Related Concept Videos

Electrodeposition01:08

Electrodeposition

692
Electrodeposition is a technique used to separate an analyte from interferents by electrochemical processes. Here, the analyte is a metal ion that can be deposited on an electrode immersed in the sample solution. The electrochemical setup consists of an anode and a cathode. When an electric current is applied to the setup, oxidation occurs at the anode. At the cathode, which consists of a large metal surface, metal ions undergo reduction and deposit onto the surface.
Electrodeposition can...
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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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Electrodes: Overview01:17

Electrodes: Overview

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 Electrochemical measurements are conducted in an electrochemical cell composed of various components that control and measure the current and potential. One fundamental component is electrodes, conductive materials that enable electron transfer reactions at their surfaces.
There are two main types of electrodes in electrochemical cells. The first type, known as the working or indicator electrode, has a potential that is sensitive to the analyte's concentration and reacts to changes in...
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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...
633
Electrogravimetric Analysis: Overview01:30

Electrogravimetric Analysis: Overview

305
Electrogravimetric analysis measures the weight of an analyte deposited electrolytically onto a suitable working electrode. This method involves applying a potential to a pre-weighed electrode submerged in a solution, which results in the desired substance being deposited through reduction at the cathode or oxidation at the anode. The electrode's weight is recorded after deposition, and the difference in weight gives the analyte's weight in the solution.
To test the completeness of the...
305
Factors Affecting Activity Coefficient01:17

Factors Affecting Activity Coefficient

878
The extended Debye-Hückel equation indicates that the activity coefficient of an ion in an aqueous solution at 25°C depends on three partially interdependent properties: the ionic strength of the solution, the charge of the ion, and the ion size. 
The activity coefficient value for an ion is close to one when the solution has almost zero ionic strength, i.e., when the solution shows close to ideal behavior. As the ionic strength of the solution increases from 0 to 0.1 mol/L, a...
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Updated: Aug 22, 2025

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Electrodeionization: Principle, techniques and factors influencing its performance.

P Senthil Kumar1, M Varsha2, B Senthil Rathi3

  • 1Deprtament of Chemical Engineering, Sri Sivasubramaniya Nadar College of Engineering, Kalavakkam, 603110, Tamil Nadu, India; Centre of Excellence in Water Research (CEWAR), Sri Sivasubramaniya Nadar College of Engineering, Kalavakkam, 603110, Tamil Nadu, India; School of Engineering, Lebanese American University, Byblos, Lebanon.

Environmental Research
|November 13, 2022
PubMed
Summary

Continuous electrodeionization (CEDI) offers a sustainable solution for removing pollutants and producing ultra-pure water. This technology is vital for industries and wastewater treatment, with advancements in materials enhancing its effectiveness.

Keywords:
Continuous electrodeionizationHigh-purity waterIon-exchange resinsMembranesWastewater treatment

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Area of Science:

  • Environmental Science
  • Chemical Engineering

Background:

  • Increasing pollution necessitates sustainable removal techniques.
  • Ultra-pure water is crucial for modern industries, requiring advanced purification methods.
  • Electrodeionization (EDI) and Continuous Electrodeionization (CEDI) are emerging as effective water purification technologies.

Approach:

  • This review examines factors influencing CEDI performance.
  • Focuses on the impact of ion-exchange resins and membranes on CEDI efficiency.
  • Highlights the development of innovative materials to improve CEDI technology.

Key Points:

  • CEDI effectively removes ionic chemicals, hazardous substances, radioactive pollutants, and heavy metals.
  • The technique contributes to wastewater treatment and the production of high-purity water.
  • Advancements in materials for CEDI promise significant ecological and economic benefits.

Conclusions:

  • CEDI is a promising technology for both water purification and wastewater treatment.
  • Optimizing ion-exchange resins and membranes is key to enhancing CEDI performance.
  • Further material innovation in CEDI can lead to substantial global environmental and financial advantages.