.png){kind=icon}
.png){kind=icon}
Return
Bipolar Membrane Capacitive Deionization for pH-Assisted Ionic Separations
.png){kind=icon}
OA
AI
DOI：10.1021/acsestengg.3c00041.png)
.png){kind=icon}
Original request for help.png){kind=icon}
Share.png){kind=icon}
Save
Abstract
En 中文
Selective ionic separations represent an increasingly importanttechnical area for the strategic interests of the U.S. economy forexample, securing critical minerals and materials and circular economyaspirations that include recovering organic acids from processed biomass.This work disseminates bipolar membrane (BPM) capacitive deionizationfor selective ionic separations from multicomponent, ionic speciesmixtures. The selective separations are guided by the Pourbaix diagramand acid-base equilibria principles. BPM capacitive deionizationwas demonstrated to generate alkaline or acidic process streams dependingupon the location of the BPM in the electrochemical cell. The roleof system operating parameters, such as the cell voltage, residencetime, and feed concentration on effluent stream pH was studied. Itwas observed that the pH adjustment in BPM-CDI/MCDI (MCDI, membranecapacitive deionization) was more sensitive to the cell voltage whencompared to the process stream residence time and salt feed concentration.The BPM-MCDI gave over 6 times higher percentage of copper(II) removalwhen compared to sodium ion removal from brine mixtures. Finally,BPM-MCDI demonstrated over 40% greater removal for copper ions frombrine mixtures and fivefold higher removal for itaconic acid frombrine mixtures when benchmarked against a traditional flow-by-MCDIsetup.
Keywords:
bipolar membranes
membrane capacitive deionization
pH-assisted ionic separations
Journal
IF:
6.7
Papers:
1.2K
Citations:
4.6K