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Title: Simultaneous fractionation, desalination, and dye removal of dye/salt mixtures by carbon cloth-modified flow-electrode capacitive deionization
Authors: Tang, Kexin
Zheng, Han
Du, Penghui
Zhou, Kun
Keywords: Engineering::Environmental engineering
Issue Date: 2022
Source: Tang, K., Zheng, H., Du, P. & Zhou, K. (2022). Simultaneous fractionation, desalination, and dye removal of dye/salt mixtures by carbon cloth-modified flow-electrode capacitive deionization. Environmental Science and Technology, 56(12), 8885-8896.
Journal: Environmental Science and Technology 
Abstract: The critical challenges of using electromembrane processes [e.g., electrodialysis and flow-electrode capacitive deionization (FCDI)] to recycle resources (e.g., water, salts, and organic compounds) from wastewater are the fractionation of dissolved ionic matter, the removal/recovery of organic components during desalination, and membrane antifouling. This study realized the simultaneous fractionation, desalination, and dye removal/recovery (FDR) treatment of dye/salt mixtures through a simple but effective approach, that is, using a carbon cloth-modified FCDI (CC-FCDI) unit, in which the carbon cloth layer was attached to the surface of each ion-exchange membrane (IEM). The IEMs and carbon-based flow-electrodes were responsible for the fractionation and desalination of dye and salt ions, while the carbon cloth layers contributed to the active membrane antifouling and dye removal/recovery by the electrosorption mechanism. Attributed to such features, the CC-FCDI unit accomplished the effective FDR treatment of dye/salt mixtures with wide ranges of salt and dye concentrations (5-20 g L-1 NaCl and 200-800 ppm methylene blue) and different dye components (cationic and anionic dyes) under various applied voltages (1.2-3.2 V). Moreover, the active membrane antifouling by virtue of the carbon cloth facilitated the excellent and sustainable FDR performance of CC-FCDI. The removal/recovery of dyes from the carbon cloth strongly depends on the characteristics of dye molecules, the surface properties of the carbon cloth, and the local pH at the IEM/CC interfaces. This study sheds light on the strategies of using multifunctional layer-modified FCDI units to reclaim resources from various high-salinity organic wastewater.
ISSN: 0013-936X
DOI: 10.1021/acs.est.2c00982
Rights: © 2022 American Chemical Society. All rights reserved.
Fulltext Permission: none
Fulltext Availability: No Fulltext
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