CAS OpenIR
Optimal conditions for efficient flow-electrode capacitive deionization
Tang, Kexin1,2,3; Yiacoumi, Sotira1; Li, Yuping2; Gabitto, Jorge4; Tsouris, Costas1,5
2020-06-01
Source PublicationSEPARATION AND PURIFICATION TECHNOLOGY
ISSN1383-5866
Volume240Pages:10
AbstractOne of the current barriers to achieving fast and stable performance for flow-electrode capacitive deionization (FCDI) is determining optimal operating parameters. To date, however, no consensus has been reached for universal conditions for FCDI. Through experimental and modeling approaches in this study, we systematically evaluated the influence of applied potential (V = 1.2-2.4 V) and electrolyte concentration (C-0 = 0.05-0.5 M) on the FCDI and electrodialysis (ED) desalination processes. Evaluation indicators include the concentration decrease in the desalinated solution, salt removal rates, pH fluctuations, charge efficiency, and energy consumption. Results demonstrated that the dynamic curves of concentration decrease at 2.0 V nearly overlapped with the response at 1.6 V at certain electrolyte concentrations, while the salt removal rates at 0.2 M salt concentration were the best among all concentrations tested at a range of applied potential. It was thus concluded that the optimum conditions for FCDI operation are 1.6 V applied potential and 0.2 M initial salt concentration, under which faradaic reactions are not being triggered, and concentration polarization does not significantly affect ion transfer. Furthermore, a comparative study between FCDI and ED indicated that ED has a different dependence on the electrolyte concentration and applied potential, in which the desalination can be linearly enhanced with increasing potential but greatly limited at high concentrations. Due to the presence of carbon particles in FCDI, the enhanced charge/ion transfer is probably the main reason for the different desalination performance of FCDI and ED. The optimal operating parameters obtained in this work could be used as basic test conditions for further development of new carbon-based materials for FCDI.
KeywordFlow-electrode Capacitive deionization Optimization FCDI modeling Activated carbon
DOI10.1016/j.seppur.2020.116626
Language英语
WOS KeywordULTRAHIGH DESALINIZATION PERFORMANCE ; IMPROVED OPERATION VOLTAGE ; WATER DESALINATION ; SEAWATER DESALINATION ; MESOPOROUS CARBON ; ENERGY ; BRACKISH ; TECHNOLOGY ; TRANSPORT ; SYSTEMS
Funding ProjectUS Department of Energy[DE-AC05-00OR22725] ; School of Civil and Environmental Engineering of the Georgia Institute of Technology ; National Natural Science Foundation of China (NSFC)[51425405] ; National Natural Science Foundation of China (NSFC)[21377130] ; China Scholarship Council (CSC)[201606250079] ; Laboratory Directed Research and Development Program of the Oak Ridge National Laboratory
WOS Research AreaEngineering
WOS SubjectEngineering, Chemical
Funding OrganizationUS Department of Energy ; School of Civil and Environmental Engineering of the Georgia Institute of Technology ; National Natural Science Foundation of China (NSFC) ; China Scholarship Council (CSC) ; Laboratory Directed Research and Development Program of the Oak Ridge National Laboratory
WOS IDWOS:000517659500018
PublisherELSEVIER
Citation statistics
Document Type期刊论文
Identifierhttp://ir.ipe.ac.cn/handle/122111/39579
Collection中国科学院过程工程研究所
Corresponding AuthorLi, Yuping; Tsouris, Costas
Affiliation1.Georgia Inst Technol, Sch Civil & Environm Engn, Atlanta, GA 30332 USA
2.Chinese Acad Sci, Beijing Engn Res Ctr Proc Pollut Control, Inst Proc Engn, Div Environm Technol & Engn, Beijing 100190, Peoples R China
3.Tianjin Univ, Natl Engn Res Ctr Distillat Technol, Sch Chem Engn & Technol, Tianjin 300072, Peoples R China
4.Prairie View A&M Univ, Dept Chem Engn, Prairie View, TX 77446 USA
5.Oak Ridge Natl Lab, Energy & Transportat Sci Div, Oak Ridge, TN 37831 USA
Recommended Citation
GB/T 7714
Tang, Kexin,Yiacoumi, Sotira,Li, Yuping,et al. Optimal conditions for efficient flow-electrode capacitive deionization[J]. SEPARATION AND PURIFICATION TECHNOLOGY,2020,240:10.
APA Tang, Kexin,Yiacoumi, Sotira,Li, Yuping,Gabitto, Jorge,&Tsouris, Costas.(2020).Optimal conditions for efficient flow-electrode capacitive deionization.SEPARATION AND PURIFICATION TECHNOLOGY,240,10.
MLA Tang, Kexin,et al."Optimal conditions for efficient flow-electrode capacitive deionization".SEPARATION AND PURIFICATION TECHNOLOGY 240(2020):10.
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