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Seawater desalination by over-potential membrane capacitive deionization: Opportunities and hurdles
Tang, Kexin1,2,3; Kim, Yong-ha1,4; Chang, Junjun3; Mayes, Richard T.5; Gabitto, Jorge6; Yiacoumi, Sotira1; Tsouris, Costas1,5
2019-02-01
Source PublicationCHEMICAL ENGINEERING JOURNAL
ISSN1385-8947
Volume357Pages:103-111
AbstractThe 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 overpotential (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 OPMCDI 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. 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.
KeywordMembrane capacitive deionization Over-potential Seawater desalination Mesoporous carbon Carbon aerogel
DOI10.1016/j.cej.2018.09.121
Language英语
WOS KeywordION-EXCHANGE MEMBRANES ; WATER DESALINATION ; CARBON ELECTRODES ; POROUS CARBON ; WASTE-WATER ; CHARGE EFFICIENCY ; MESOPOROUS CARBON ; FLOW-ELECTRODE ; DOUBLE-LAYER ; VOLTAGE
Funding ProjectU.S. Department of Energy[DE-AC05-00OR22725] ; Laboratory Directed Research and Development program of ORNL ; China Scholarship Council (CSC)[201606250079] ; Department of Energy
WOS Research AreaEngineering
WOS SubjectEngineering, Environmental ; Engineering, Chemical
Funding OrganizationU.S. Department of Energy ; Laboratory Directed Research and Development program of ORNL ; China Scholarship Council (CSC) ; Department of Energy
WOS IDWOS:000448181000011
PublisherELSEVIER SCIENCE SA
Citation statistics
Document Type期刊论文
Identifierhttp://ir.ipe.ac.cn/handle/122111/26453
Collection中国科学院过程工程研究所
Corresponding AuthorTsouris, Costas
Affiliation1.Georgia Inst Technol, Sch Civil & Environm Engn, Atlanta, GA 30332 USA
2.Tianjin Univ, Natl Engn Res Ctr Distillat Technol, Sch Chem Engn & Technol, Tianjin 300072, Peoples R China
3.Chinese Acad Sci, Beijing Engn Res Ctr Proc Pollut Control, Inst Proc Engn, Div Environm Technol & Engn, Beijing 100190, Peoples R China
4.Louisiana State Univ, Dept Environm Sci, Baton Rouge, LA 70803 USA
5.Oak Ridge Natl Lab, POB 2009, Oak Ridge, TN 37831 USA
6.Prairie View A&M Univ, Dept Chem Engn, Prairie View, TX 77446 USA
Recommended Citation
GB/T 7714
Tang, Kexin,Kim, Yong-ha,Chang, Junjun,et al. Seawater desalination by over-potential membrane capacitive deionization: Opportunities and hurdles[J]. CHEMICAL ENGINEERING JOURNAL,2019,357:103-111.
APA Tang, Kexin.,Kim, Yong-ha.,Chang, Junjun.,Mayes, Richard T..,Gabitto, Jorge.,...&Tsouris, Costas.(2019).Seawater desalination by over-potential membrane capacitive deionization: Opportunities and hurdles.CHEMICAL ENGINEERING JOURNAL,357,103-111.
MLA Tang, Kexin,et al."Seawater desalination by over-potential membrane capacitive deionization: Opportunities and hurdles".CHEMICAL ENGINEERING JOURNAL 357(2019):103-111.
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