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Franklab
Capacitive Deionization (CDI) Device
Capacitive Deionization (CDI) Device
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$1,980.00 USD
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$1,980.00 USD
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Product Description
Capacitive Deionization (CDI) Device
Product Overview
The Capacitive Deionization (CDI) Device is a laboratory-scale electrochemical water treatment system based on electric double-layer capacitance (EDLC) theory. It is designed for efficient desalination, ion removal, and water purification under low applied voltages.
When a low DC voltage is applied across the electrodes, cations and anions in the aqueous solution migrate toward oppositely charged electrodes under the combined influence of the electric field and concentration gradients. These ions are electrostatically adsorbed onto the electrode surfaces, forming electric double layers. As a result, dissolved salts and charged species are removed from the water stream without phase change or chemical additives.
This technology is also commonly referred to as Electrosorption Technology (EST) and is widely studied for applications in brackish water desalination, wastewater treatment, selective ion removal, and electrochemical separation research.
Working Principle
1.Charging Stage (Adsorption)
•A low voltage is applied between the two porous electrodes.
•Positive ions migrate toward the cathode; negative ions migrate toward the anode.
•Ions are stored in the electric double layers on the electrode surfaces.
2.Discharging Stage (Desorption / Regeneration)
•The applied voltage is reduced or reversed.
•Adsorbed ions are released back into the solution, regenerating the electrodes.
This reversible process enables low-energy desalination, long electrode life, and cyclic operation.
Key Features
•Low-Voltage Operation Operates under mild electrical conditions, reducing energy consumption and electrode degradation.
•High-Purity Graphite Current Collectors Uses imported ultra-pure graphite (resistivity ~520 μΩ·cm), ensuring excellent conductivity and chemical stability.
•Serpentine Flow Channel Design Enhances solution residence time, improves ion transport efficiency, and ensures uniform flow distribution.
•Compact Electrode Spacing Cathode–anode distance less than 3 mm, significantly reducing internal resistance and improving adsorption kinetics.
•Modular Structural Design Easy disassembly, electrode replacement, and experimental configuration adjustments.
•Research-Grade Materials PMMA, PEEK, and high-purity graphite ensure chemical resistance and mechanical robustness.
Device Structure
The CDI device consists of the following key components:
•Protective Side Plates Made of PMMA, providing mechanical support and visual inspection capability.
•Current Collector Plates Fabricated from imported ultra-pure graphite with serpentine flow channels.
•Flow Channel Layer Precisely machined serpentine channels ensure controlled solution flow and efficient ion transport.
•PEEK Structural Frame Provides excellent chemical resistance and maintains stable electrode spacing.
•Electrode Assembly Compatible with porous carbon-based CDI electrodes (user-configurable).
Technical Specifications
| Item | Specification |
| Technology | Capacitive Deionization (CDI) / Electrosorption |
| Protective Plate Material | PMMA |
| Current Collector Material | Imported ultra-pure graphite (ρ ≈ 520 μΩ·cm) |
| Flow Channel Type | Serpentine |
| Current Collector Size | 115 × 120 × 10 mm |
| Flow Channel Area | 50 × 50 × 2 mm |
| PEEK Frame Size | 140 × 140 × 10 mm |
| Electrode Spacing | < 3 mm |
| Operating Voltage | Low voltage (typ. < 1.5 V, user-defined) |
| Application Mode | Adsorption / Desorption cycles |
Typical Applications
•Brackish water and low-salinity desalination
•Selective ion removal (e.g., Na⁺, Cl⁻, heavy metals)
•Electrochemical water purification research
•CDI electrode material evaluation
•Flow field and ion transport mechanism studies
•Energy-efficient separation technology development
Advantages for Research and Development
•Clear demonstration of electric double-layer ion adsorption
•Flexible flow field and electrode configuration
•Suitable for fundamental CDI mechanism studies
•Supports performance comparison of different electrode materials
•Ideal for academic research, pilot testing, and teaching demonstrations
Customization Options
•Alternative flow field geometries
•Adjustable channel dimensions
•Custom electrode sizes and materials
•Modified plate thickness or housing materials
For Custom Orders or Inquiries
If you have custom requirements or any additional questions, feel free to contact us:
Email: support@franklab.shop