Seawater desalination by over-potential membrane capacitive deionization: Opportunities and hurdles
Abstract
The salt removal capacity (SRC) of the carbon electrodes in membrane capacitive deionization (MCDI) is limited by the applied potential (<1.6 V). Thus, enhancement of the SRC is essential before applying MCDI to seawater desalination. This study aims at developing a novel MCDI system for seawater desalination by applying over-potential (OP) to enhance ion-adsorption capacity and kinetics, and by reversing the polarity (RP) of electrodes to improve ion-desorption kinetics (hereafter named OP-MCDI-RP) for seawater desalination. At 2.4 V, the OP-MCDI system with mesoporous carbon demonstrated a SRC value of 64.7 mg g–1 when desalting 0.5 M NaCl solution, while the OP-CDI system could only remove 8.2 mg g–1 under identical conditions. Similarly, an OP-MCDI cell using carbon aerogel demonstrated a greater SRC value of 43.4 mg g–1 in comparison with 12.5 mg g–1 achieved in OP-CDI. These results indicate that the OP-MCDI system can directly desalt high salinity water regardless of the electrode material. In contrast to the OP-MCDI system, the OP-MCDI-RP system yields a higher regeneration efficiency by applying a reversed low-voltage. It is shown that, under appropriate operating conditions, the OP-MCDI-RP system reduced the electrical conductivity of a seawater sample of 37 practical salinity units by 99.9%, suggestingmore »
- Authors:
-
- Georgia Inst. of Technology, Atlanta, GA (United States); Tianjin Univ., Tianjin (People's Republic of China); Chinese Academy of Sciences (CAS), Beijing (China)
- Georgia Inst. of Technology, Atlanta, GA (United States); Louisiana State Univ., Baton Rouge, LA (United States)
- Chinese Academy of Sciences (CAS), Beijing (China)
- Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
- Prairie View A&M Univ., Prairie View, TX (United States)
- Georgia Inst. of Technology, Atlanta, GA (United States)
- Georgia Inst. of Technology, Atlanta, GA (United States); Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
- Publication Date:
- Research Org.:
- Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
- Sponsoring Org.:
- USDOE
- OSTI Identifier:
- 1488696
- Grant/Contract Number:
- AC05-00OR22725
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Chemical Engineering Journal
- Additional Journal Information:
- Journal Volume: 357; Journal Issue: C; Journal ID: ISSN 1385-8947
- Publisher:
- Elsevier
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY; Membrane capacitive deionization; Over-potential; Seawater desalination; Mesoporous carbon; Carbon aerogel
Citation Formats
Tang, Kexin, Kim, Yong-ha, Chang, Junjun, Mayes, Richard T., Gabitto, Jorge, Yiacoumi, Sotira Z., and Tsouris, Costas. Seawater desalination by over-potential membrane capacitive deionization: Opportunities and hurdles. United States: N. p., 2018.
Web. doi:10.1016/j.cej.2018.09.121.
Tang, Kexin, Kim, Yong-ha, Chang, Junjun, Mayes, Richard T., Gabitto, Jorge, Yiacoumi, Sotira Z., & Tsouris, Costas. Seawater desalination by over-potential membrane capacitive deionization: Opportunities and hurdles. United States. doi:10.1016/j.cej.2018.09.121.
Tang, Kexin, Kim, Yong-ha, Chang, Junjun, Mayes, Richard T., Gabitto, Jorge, Yiacoumi, Sotira Z., and Tsouris, Costas. Mon .
"Seawater desalination by over-potential membrane capacitive deionization: Opportunities and hurdles". United States. doi:10.1016/j.cej.2018.09.121. https://www.osti.gov/servlets/purl/1488696.
@article{osti_1488696,
title = {Seawater desalination by over-potential membrane capacitive deionization: Opportunities and hurdles},
author = {Tang, Kexin and Kim, Yong-ha and Chang, Junjun and Mayes, Richard T. and Gabitto, Jorge and Yiacoumi, Sotira Z. and Tsouris, Costas},
abstractNote = {The salt removal capacity (SRC) of the carbon electrodes in membrane capacitive deionization (MCDI) is limited by the applied potential (<1.6 V). Thus, enhancement of the SRC is essential before applying MCDI to seawater desalination. This study aims at developing a novel MCDI system for seawater desalination by applying over-potential (OP) to enhance ion-adsorption capacity and kinetics, and by reversing the polarity (RP) of electrodes to improve ion-desorption kinetics (hereafter named OP-MCDI-RP) for seawater desalination. At 2.4 V, the OP-MCDI system with mesoporous carbon demonstrated a SRC value of 64.7 mg g–1 when desalting 0.5 M NaCl solution, while the OP-CDI system could only remove 8.2 mg g–1 under identical conditions. Similarly, an OP-MCDI cell using carbon aerogel demonstrated a greater SRC value of 43.4 mg g–1 in comparison with 12.5 mg g–1 achieved in OP-CDI. These results indicate that the OP-MCDI system can directly desalt high salinity water regardless of the electrode material. In contrast to the OP-MCDI system, the OP-MCDI-RP system yields a higher regeneration efficiency by applying a reversed low-voltage. It is shown that, under appropriate operating conditions, the OP-MCDI-RP system reduced the electrical conductivity of a seawater sample of 37 practical salinity units by 99.9%, suggesting that the OP-MCDI-RP system can be employed for seawater desalination. In conclusion, due to the dramatic increase in energy demand and insufficient long-term stability caused by high potential and high salt concentration, however, the OP-MCDI-RP process should be further investigated for potential practical applications.},
doi = {10.1016/j.cej.2018.09.121},
journal = {Chemical Engineering Journal},
number = C,
volume = 357,
place = {United States},
year = {2018},
month = {9}
}
Web of Science
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