DOI: 10.1016/j.watres.2018.10.044
Scopus记录号: 2-s2.0-85055904493
论文题名: Enhancing capacitive deionization performance with charged structural polysaccharide electrode binders
作者: Kim M. ; Cerro M.D. ; Hand S. ; Cusick R.D.
刊名: Water Research
ISSN: 431354
出版年: 2019
起始页码: 388
结束页码: 397
语种: 英语
英文关键词: Capacitive deionization
; Carboxymethyl cellulose
; Chitosan
; Desalination
; Structural polysaccharide binders
Scopus关键词: Adsorption
; Binders
; Carbon
; Cellulose
; Chitosan
; Desalination
; Electrodes
; Fluorine compounds
; Ion exchange
; Ion exchange membranes
; Ions
; Polysaccharides
; Adsorption capacities
; Capacitive deionization
; Carboxy-methyl cellulose
; Chemically modified carbon
; Composite electrode
; One-dimensional model
; Polyvinylidene fluorides
; Positive electrodes
; Electric discharges
; activated carbon
; carboxymethylcellulose
; chitosan
; polysaccharide
; polyvinylidene fluoride
; sodium chloride
; adsorption
; cellulose
; chemical binding
; composite
; desalination
; discharge
; electrode
; fluoride
; ion exchange
; ionization
; one-dimensional modeling
; performance assessment
; polysaccharide
; salt
; adsorption
; Article
; capacitive deionization
; chemical procedures
; controlled study
; desalination
; electric potential
; ion exchange
; pH
; priority journal
; surface area
; Adsorption
; Binders
; Carbon
; Cellulose
; Chitosan
; Deionization
英文摘要: Capacitive deionization (CDI) performance, as measured by salt adsorption capacity (SAC) and energy normalized adsorption of salt (ENAS), is frequently limited by anion repulsion at the positive electrode. In this work, we investigate the ability to prevent co-ion repulsion by increasing complementary fixed charged within the electrode macropores by binding composite CDI electrodes with the ionically charged structural polysaccharides chitosan and carboxymethyl cellulose. When employing asymmetrically charged electrode binders, co-ion repulsion was prevented, resulting in SAC and ENAS values that were three times greater than composite electrodes bound with polyvinylidene fluoride (PVDF) and similar to CDI electrodes composed of chemically modified carbon. Polysaccharide binders did not modify the charge balance in the carbon micropores but did shift the discharge voltage of maximum adsorption, enabling a shift in operating voltage that prolonged cycle lifetime without a significant loss in performance. The mechanism of improved salt accumulation with polysaccharide binders was explored with a one-dimensional model that integrated CDI and ion-exchange membrane covered (MCDI) sub-units. Model simulations indicate that carbon macropores covered with thin layers of charged polysaccharides increase adsorption by a sequential accumulation and release of salt to depleted uncovered pores. © 2018 Elsevier Ltd Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/122197
Appears in Collections: 气候变化事实与影响
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作者单位: Department of Civil and Environmental Engineering, University of Illinois at Urbana-Champaign, 205 North Mathews Avenue, 3217 Newmark Civil Engineering Laboratory, Urbana, IL 61801, United States
Recommended Citation:
Kim M.,Cerro M.D.,Hand S.,et al. Enhancing capacitive deionization performance with charged structural polysaccharide electrode binders[J]. Water Research,2019-01-01