scholarly journals Modification of Cation-Exchange Membranes with Polyelectrolyte Multilayers to Tune Ion Selectivity in Capacitive Deionization

2020 ◽  
Vol 12 (31) ◽  
pp. 34746-34754 ◽  
Author(s):  
Sevil Sahin ◽  
Jouke E. Dykstra ◽  
Han Zuilhof ◽  
Rafael L. Zornitta ◽  
Louis C.P.M. de Smet
Keyword(s):  
Cation Exchange ◽  
Ion Selectivity ◽  
Polyelectrolyte Multilayers ◽  
Capacitive Deionization

scholarly journals Long-lasting, monovalent-selective capacitive deionization electrodes

2021 ◽  
Vol 4 (1) ◽  
Author(s):  
Eric N. Guyes ◽  
Amit N. Shocron ◽  
Yinke Chen ◽  
Charles E. Diesendruck ◽  
Matthew E. Suss
Keyword(s):  
Water Treatment ◽  
Ionic Conductivity ◽  
Ion Selectivity ◽  
Single Step ◽  
Carbon Electrodes ◽  
Capacitive Deionization ◽  
Treatment Technologies ◽  
Porous Carbon Electrodes ◽  
Monovalent Ion ◽  
Direct Use

AbstractEmerging water purification applications often require tunable and ion-selective technologies. For example, when treating water for direct use in irrigation, often monovalent Na+ must be removed preferentially over divalent minerals, such as Ca2+, to reduce both ionic conductivity and sodium adsorption ratio (SAR). Conventional membrane-based water treatment technologies are either largely non-selective or not dynamically tunable. Capacitive deionization (CDI) is an emerging membraneless technology that employs inexpensive and widely available activated carbon electrodes as the active element. We here show that a CDI cell leveraging sulfonated cathodes can deliver long-lasting, tunable monovalent ion selectivity. For feedwaters containing Na+ and Ca2+, our cell achieves a Na+/Ca2+ separation factor of up to 1.6. To demonstrate the cell longevity, we show that monovalent selectivity is retained over 1000 charge–discharge cycles, the highest cycle life achieved for a membraneless CDI cell with porous carbon electrodes to our knowledge, while requiring an energy consumption of ~0.38 kWh/m3 of treated water. Furthermore, we show substantial and simultaneous reductions of ionic conductivity and SAR, such as from 1.75 to 0.69 mS/cm and 19.8 to 13.3, respectively, demonstrating the potential of such a system towards single-step water treatment of brackish and wastewaters for direct use in irrigation.

scholarly journals Nickel hexacyanoferrate electrodes for high mono/divalent ion-selectivity in capacitive deionization

Desalination ◽  
2020 ◽  
Vol 481 ◽  
pp. 114346 ◽  
Author(s):  
Kaustub Singh ◽  
Zexin Qian ◽  
P.M. Biesheuvel ◽  
Han Zuilhof ◽  
Slawomir Porada ◽  
...  
Keyword(s):  
Ion Selectivity ◽  
Capacitive Deionization ◽  
Nickel Hexacyanoferrate

scholarly journals Ion selectivity in capacitive deionization with functionalized electrode: Theory and experimental validation

2018 ◽  
Vol 1 ◽  
pp. 100008 ◽  
Author(s):  
Diego I. Oyarzun ◽  
Ali Hemmatifar ◽  
James W. Palko ◽  
Michael Stadermann ◽  
Juan G. Santiago
Keyword(s):  
Experimental Validation ◽  
Ion Selectivity ◽  
Capacitive Deionization

scholarly journals High Selectivities among Monovalent Cations in Dialysis through Cation-Exchange Membranes Coated with Polyelectrolyte Multilayers

2018 ◽  
Vol 10 (50) ◽  
pp. 44134-44143 ◽  
Author(s):  
Liu Yang ◽  
Chao Tang ◽  
Muhammad Ahmad ◽  
Andriy Yaroshchuk ◽  
Merlin L. Bruening
Keyword(s):  
Cation Exchange ◽  
Polyelectrolyte Multilayers ◽  
Monovalent Cations

Well-dispersed few-layered MoS2 connected with robust 3D conductive architecture for rapid capacitive deionization process and its specific ion selectivity

Desalination ◽  
2021 ◽  
Vol 520 ◽  
pp. 115325
Author(s):  
Yanmeng Cai ◽  
Wen Zhang ◽  
Rongli Fang ◽  
Dongdong Zhao ◽  
Yue Wang ◽  
...  
Keyword(s):  
Ion Selectivity ◽  
Capacitive Deionization ◽  
Layered Mos2
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