TY - JOUR
T1 - Specific Removal and Recovery of Bromide Ions
T2 - The Search for Stable Electrodes and Operation Modes
AU - Cohen, Izaak
AU - Shapira, Barak
AU - Shopin, Alexey
AU - Elias, Yuval
AU - Avraham, Eran
AU - Aurbach, Doron
N1 - Publisher Copyright:
© 2024 The Author(s). Published on behalf of The Electrochemical Society by IOP Publishing Limited.
PY - 2024/3/31
Y1 - 2024/3/31
N2 - In previous work, we introduced an elegant approach for bromide recovery from water by the introduction of a hybrid physical adsorption and capacitive deionization processes for selective removal and recovery of boron from water. In this paper, we show that the harsh environment of water contaminated with bromine-moieties adversely affects the longevity of relevant electrodes, with close to 100 consecutive work hours of bromides removal without noticeable degradation. To extend the lifespan of electrodes, we used an asymmetric CDI cell with a 1:5 positive/negative electrodes ratio in which a polarity switch between electrodes is applied every six adsorption-desorption cycles in a way that in each adsorption-desorption cycle, a different electrode of the six electrodes, functions as the positive electrode. We deduce that the polarity switch reduces oxidation and subsequent degradation of the positive electrodes, resulting in an extended lifecycle. After examining nine different carbonaceous materials, carbon cloth was chosen to be incorporated in the bromide- recovery cells because of its favorable kinetics and its physical and mechanical properties. We show that with a combination between endurance of the electrodes and asymmetric mode of operation, it is possible to overcome the main barrier that holds the technology from being practical.
AB - In previous work, we introduced an elegant approach for bromide recovery from water by the introduction of a hybrid physical adsorption and capacitive deionization processes for selective removal and recovery of boron from water. In this paper, we show that the harsh environment of water contaminated with bromine-moieties adversely affects the longevity of relevant electrodes, with close to 100 consecutive work hours of bromides removal without noticeable degradation. To extend the lifespan of electrodes, we used an asymmetric CDI cell with a 1:5 positive/negative electrodes ratio in which a polarity switch between electrodes is applied every six adsorption-desorption cycles in a way that in each adsorption-desorption cycle, a different electrode of the six electrodes, functions as the positive electrode. We deduce that the polarity switch reduces oxidation and subsequent degradation of the positive electrodes, resulting in an extended lifecycle. After examining nine different carbonaceous materials, carbon cloth was chosen to be incorporated in the bromide- recovery cells because of its favorable kinetics and its physical and mechanical properties. We show that with a combination between endurance of the electrodes and asymmetric mode of operation, it is possible to overcome the main barrier that holds the technology from being practical.
KW - bromide removal
KW - capacitive deionization
KW - electrosorpion
KW - water desalination
UR - http://www.scopus.com/inward/record.url?scp=85188824022&partnerID=8YFLogxK
U2 - 10.1149/1945-7111/ad3396
DO - 10.1149/1945-7111/ad3396
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AN - SCOPUS:85188824022
SN - 0013-4651
VL - 171
JO - Journal of the Electrochemical Society
JF - Journal of the Electrochemical Society
IS - 3
M1 - 036507
ER -