DOI: 10.1016/j.watres.2018.07.049
Scopus记录号: 2-s2.0-85052050164
论文题名: Analysis of capacitive and electrodialytic contributions to water desalination by flow-electrode CDI
作者: Ma J. ; He C. ; He D. ; Zhang C. ; Waite T.D.
刊名: Water Research
ISSN: 431354
出版年: 2018
卷: 144 起始页码: 296
结束页码: 303
语种: 英语
英文关键词: Brackish water
; Capacitive deionization
; Charge transfer
; Flow-electrode
Scopus关键词: Carbon
; Charge transfer
; Chlorine compounds
; Desalination
; Electrodes
; Ion exchange
; Ions
; Seawater
; Sodium compounds
; Water filtration
; Asymmetric behaviors
; Brackish water
; Capacitive deionization
; Design and operations
; Electrical double layers
; Electrode properties
; High carbon content
; Seawater desalination
; Ion exchange membranes
; brackish water
; desalination
; electric field
; electrode
; electrokinesis
; ion exchange
; membrane
; performance assessment
; seawater
; water treatment
英文摘要: While flow-electrode capacitive deionization (FCDI) is a potential alternative to brackish and/or sea water desalination, there is limited understanding of both the fate of ions following migration across the ion exchange membranes and the mechanisms responsible for ion separation. In this study, we investigate the desalting performance of an FCDI system operated over a range of conditions. Results show that although ion transport as a result of electrodialysis is inevitable in FCDI (and is principally responsible for pH excursion in the flow electrode), the use of high carbon content ensures that a high proportion of the charge and counterions are retained in the electrical double layers of the flowing carbon particles, even at high charging voltages (e.g., 2.0 V) during the deionization process. Estimation of the portions of sodium and chloride ions adsorbed in the flow electrode after migration through the membranes suggests that the ongoing capacitive adsorption exhibits asymmetric behavior with the anodic particles demonstrating better affinity for Cl− (than the cathodic particles for Na+) during electrosorption. These findings provide an explanation for the change in electrode properties that are observed under imperfect adsorption scenarios and provide insight into aspects of the design and operation of flow electrode pairs that is critical to achieving effective desalination by FCDI. © 2018 Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/112498
Appears in Collections: 气候减缓与适应
There are no files associated with this item.
作者单位: UNSW Water Research Centre, School of Civil and Environmental Engineering, University of New South Wales, Sydney, NSW 2052, Australia; Institute of Environmental Health and Pollution Control, Guangdong University of Technology, Guangzhou, 510006, China; Guangzhou Key Laboratory of Environmental Catalysis and Pollution Control, School of Environmental Science and Engineering, Guangdong University of Technology, Guangzhou, 510006, China
Recommended Citation:
Ma J.,He C.,He D.,et al. Analysis of capacitive and electrodialytic contributions to water desalination by flow-electrode CDI[J]. Water Research,2018-01-01,144