Related Experiment Video
Updated: Jun 14, 2026
10:19
Three-Dimensionally Printed Microfluidic Cross-flow System for Ultrafiltration/Nanofiltration Membrane Performance Testing
Published on: February 13, 2016
11.5K
Fouling in Capacitive Deionization: A Critical Review
Xiangtong Kong1, Changyong Zhang2, Chia-Hung Hou3
1Water Research Centre, School of Civil and Environmental Engineering, The University of New South Wales, Sydney, NSW 2052, Australia.
Environmental Science & Technology
|June 29, 2025
Summary
Capacitive deionization (CDI) effectively removes charged species but faces operational challenges like fouling. Understanding and mitigating inorganic, organic, and composite fouling is key to improving CDI technology for water treatment.
Area of Science:
- Environmental Science
- Materials Science
- Chemical Engineering
Background:
- Capacitive deionization (CDI) is an emerging technology for water purification and resource recovery.
- Despite its potential, CDI faces operational challenges, primarily related to electrode and membrane fouling.
- Fouling, caused by inorganic, organic, and composite contaminants, reduces efficiency and longevity.
Purpose of the Study:
- To provide a comprehensive review of fouling in Capacitive deionization (CDI).
- To evaluate current fouling characterization techniques and their limitations.
- To identify strategies for mitigating fouling and enhancing CDI performance.
Main Methods:
- Literature review of inorganic, organic, and composite fouling mechanisms in CDI.
- Analysis of factors influencing fouling, including feed properties and operating parameters.
- Assessment of existing CDI cleaning protocols and identification of research gaps.
Main Results:
- Electrosorption of ions and hydrophobic interactions lead to pore clogging and reduced capacity.
- Feed and electrode properties, along with operating conditions, significantly impact fouling.
- Current characterization techniques have varying strengths and limitations.
Conclusions:
- A thorough understanding of fouling is essential for the widespread application of CDI.
- Effective cleaning protocols and further research are needed to address fouling issues.
- Mitigating fouling will enhance the cost-effectiveness and reliability of CDI systems.
More Related Videos
Related Concept Videos
01:13Finding Electric Potential From Electric Field
For a system of charges, it is easy to calculate the system's potential because potential is a scalar quantity. However, in some instances where calculating the electric field is more straightforward than finding the potential, the electric field is used to calculate the system's potential. For a positive charge, the electric field is radially outward, and the potential is positive at any finite distance from the positive charge. In such an electric field, the motion away from the positive...
01:09Electron Behavior
Electrons are negatively charged subatomic particles attracted to and orbit around the positively-charged nucleus of an atom. They reside in spaces associated with energy levels called shells and are further organized into subshells and orbitals within each shell.
Electrons Orbit the Nucleus
Electrons are found in specific locations outside of the nucleus. The shell in which an electron resides indicates the general energy level of the electron: those closer to the nucleus have less energy,...
Electrons Orbit the Nucleus
Electrons are found in specific locations outside of the nucleus. The shell in which an electron resides indicates the general energy level of the electron: those closer to the nucleus have less energy,...
01:29Electrical Transport
The electrical transport property of a material is defined by its resistance and conductivity. Resistance is the measure of a material's ability to resist the flow of electric current, while conductivity gauges its ability to allow the current to pass through, depending on the geometry of the measurement cell, such as electrode spacing and area. Conductivity is measured in Siemens (S). There are different types of conductance, including specific conductance, equivalent conductance, and molar...
01:24Electrochemical Systems
Electrochemical systems provide a fascinating insight into the dynamic interplay of charged species within various phases. One notable example is the interaction between a membrane permeable to K⁺ ions but not to Cl⁻ ions, separating an aqueous KCl solution from pure water. As K⁺ ions diffuse through the membrane, they generate net charges on each phase, leading to a potential difference between them.Similarly, when a piece of Zn is immersed in an aqueous ZnSO₄ solution, the Zn metal, composed...
01:28Electrochemical Cells
Electrochemical cells are systems that convert chemical energy into electrical energy or use electrical energy to drive chemical reactions. They consist of two electrodes in contact with an electrolyte, where redox reactions enable electron transfer. Most electrochemical cells include two half-cells connected by an external wire for electron flow and a salt bridge for ion flow. The salt bridge contains an electrolyte solution and maintains charge neutrality by allowing ions—not electrons—to...
01:30The Electrical Double Layer
In the region where two bulk phases meet, an intricate electric charge distribution arises due to charge transfer, ion adsorption, molecular orientation, and charge distortion. This complex distribution is commonly referred to as the electrical double layer.When a solid electrode interfaces with ions in an electrolyte solution, the speed of electron transfer dictates the rates of oxidation and reduction. The electrode acquires a charge through the escape of atoms into the solution as cations or...