Journal article
Influence of operating conditions on the desalination performance of a symmetric pre-conditioned Ti3C2Tx-MXene membrane capacitive deionization system
Desalination, v 477, 114267
01 Mar 2020
Featured in Collection : UN Sustainable Development Goals @ Drexel
Abstract
Introduction of new nanomaterials with conductivity, salt adsorption capacity (SAC) and rate (SAR) exceeding that of carbon electrodes may greatly improve capacitive deionization of water. However, those materials show a different electrochemical behavior, which must be studied and optimized for practical use. Here, effects of operating conditions on desalination performance of pre-conditioned Ti3C2Tx-MXene-based electrodes in a symmetric membrane capacitive deionization (MCDI) system were investigated. Specifically, influences of discharge potential, half-cycle length (HCL), and flow rate were systematically studied. Results showed different degrees of performance dependence on operating conditions. For instance, lower discharge potentials increased SAC and SAR by 152%. However, longer HCL increased SAC by 32% while decreasing SAR by 54%. Finally, faster flow rates decreased both SAC and SAR by 20%. Desalination performances of symmetric pre-conditioned MXene and activated carbon cloth (ACC) electrodes were gravimetrically and volumetrically compared in MCDI system. Pre-conditioned MXene electrodes gravimetrically performed 30% lower than ACC due to their notably higher density. Yet, pre-conditioned MXene electrodes volumetrically outperformed ACC by 162%. Results suggest that although MXenes offer high electrochemical activity and hydrophilicity, making them promising candidates for CDI applications, the strong dependence of desalination performance of MXenes on operating conditions requires in-depth understanding and warrants further research.
• Pre-conditioned MXene outperforms ACC by 162% due to bulk volume ion storage.
• Pre-conditioned MXene MCDI system has shown steady SAC for 100 cycles.
• Lower discharge potentials enable more effective ion deintercalation.
• Improved ion deintercalation leads to up to 152% increase in SAC and SAR.
• Longer half-cycle length increases SAC by 32% and decreases SAR by 54%.
Metrics
Details
- Title
- Influence of operating conditions on the desalination performance of a symmetric pre-conditioned Ti3C2Tx-MXene membrane capacitive deionization system
- Creators
- Lutfi Agartan - Drexel UniversityKanit Hantanasirisakul - Drexel UniversitySamantha Buczek - Drexel UniversityBilen Akuzum - Drexel UniversityKhaled A. Mahmoud - Qatar Environment and Energy Research InstituteBabak Anasori - Drexel UniversityYury Gogotsi - Drexel University, Materials Science and EngineeringE. Caglan Kumbur - Drexel University, Mechanical Engineering and Mechanics
- Publication Details
- Desalination, v 477, 114267
- Publisher
- Elsevier
- Resource Type
- Journal article
- Language
- English
- Academic Unit
- Materials Science and Engineering; Mechanical Engineering and Mechanics
- Web of Science ID
- WOS:000509630500013
- Scopus ID
- 2-s2.0-85076572144
- Other Identifier
- 991019168507504721
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- Collaboration types
- Domestic collaboration
- International collaboration
- Web of Science research areas
- Engineering, Chemical
- Water Resources