Dissertation
Electrosorption kinetics and salt removal performance of capacitive deionization systems
Doctor of Philosophy (Ph.D.), Drexel University
May 2021
DOI:
https://doi.org/10.17918/00000396
Abstract
Capacitive deionization (CDI) is an emerging water desalination technology that offers unique advantages for energy efficient water desalination due to its design flexibility, long cycle life, low energy demand, reversible operation at low pressure and room temperature, simultaneous ion adsorption, and high coulombic efficiency. Despite their potential, a series of technical challenges hinder the widespread utilization of CDI systems. Among these, limited desalination performance has been identified as the key issue. This issue is primarily governed by the underutilization of electrodes, slow adsorption kinetics, and diminished energy efficiency of the system. Presently, the desalination performances of the CDI systems are limited by the lack of fundamental understanding of effects of operating conditions and electrode properties on the electrosorption kinetics. This PhD study seeks to address this critical issue by exploring fundamental mechanisms responsible for ion adsorption in electrodes. The overall objective of this dissertation is to establish a fundamental understanding of the effects of operating conditions and electrode properties on the desalination performances of the CDI systems by investigating the dependence of effective ion delivery on the composition and nanoscale morphology of the electrodes and flow directionality of the saline water. To achieve these goals, series of experiments were designed. Several materials and electrochemical characterization techniques were used to characterize electrode materials and study the effects of various operating conditions on the desalination performances of CDI systems. Using these experimental data, a fundamental understanding of the effects of electrode properties and operating conditions on the desalination kinetics and performance of the CDI systems has been obtained. Finally, this understanding was utilized to identify strategies for more effective delivery of ions, for improved utilization of the electrodes. Keywords: Activated Carbon Cloth, Capacitive Deionization, Electrosorption Kinetics, MXene, Salt Adsorption, Water Desalination
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Details
- Title
- Electrosorption kinetics and salt removal performance of capacitive deionization systems
- Creators
- Lutfi Agartan
- Contributors
- Emin C. Kumbur (Advisor)
- Awarding Institution
- Drexel University
- Degree Awarded
- Doctor of Philosophy (Ph.D.)
- Publisher
- Drexel University; Philadelphia, Pennsylvania
- Number of pages
- xv, 128 pages
- Resource Type
- Dissertation
- Language
- English
- Academic Unit
- College of Engineering (1970-2026); Mechanical Engineering (and Mechanics) (1970-2026); Drexel University
- Other Identifier
- 991015051548804721