Simultaneous Fractionation, Desalination, and Dye Removal of Dye/Salt Mixtures by Carbon Cloth-Modified Flow-electrode Capacitive Deionization

Tang，Kexin1; Zheng，Han1,2; Du，Penghui3; Zhou，Kun1,4

2022

10.1021/acs.est.2c00982

ENVIRONMENTAL SCIENCE & TECHNOLOGY   Impact Factor & Quartile

0013-936X

1520-5851

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.

antifouling dyes electrodialysis electrosorption ion-exchange membranes limiting current mixtures salts

SCI ; EI

English

NI Journal Papers

Others

WOS:000815337400001

20222712313103

Aromatic compounds ; Carbon ; Desalination ; Dialysis membranes ; Dyes ; Electrodes ; Electrodialysis ; Ion exchange ; Ion exchange membranes ; Ions ; Sodium chloride

Water Treatment Techniques:445.1 ; Chemical Plants and Equipment:802.1 ; Chemical Reactions:802.2 ; Chemical Agents and Basic Industrial Chemicals:803 ; Chemical Products Generally:804 ; Organic Compounds:804.1

ENVIRONMENT/ECOLOGY

2-s2.0-85133207280

Scopus

1.Environmental Process Modelling Centre,Nanyang Environment and Water Research Institute,Nanyang Technological University,Singapore,1 Cleantech Loop,637141,Singapore
2.Interdisciplinary Graduate School,Nanyang Technological University,Singapore,50 Nanyang Avenue,639798,Singapore
3.State Environmental Protection Key Laboratory of Integrated Surface Water-Groundwater Pollution Control,School of Environmental Science and Engineering,Southern University of Science and Technology,Shenzhen,518055,China
4.Singapore Centre for 3D Printing,School of Mechanical and Aerospace Engineering,Nanyang Technological University,Singapore,50 Nanyang Avenue,639798,Singapore

Tang，Kexin,Zheng，Han,Du，Penghui,et al. Simultaneous Fractionation, Desalination, and Dye Removal of Dye/Salt Mixtures by Carbon Cloth-Modified Flow-electrode Capacitive Deionization[J]. ENVIRONMENTAL SCIENCE & TECHNOLOGY,2022,56:8885-8896.

Tang，Kexin,Zheng，Han,Du，Penghui,&Zhou，Kun.(2022).Simultaneous Fractionation, Desalination, and Dye Removal of Dye/Salt Mixtures by Carbon Cloth-Modified Flow-electrode Capacitive Deionization.ENVIRONMENTAL SCIENCE & TECHNOLOGY,56,8885-8896.

Tang，Kexin,et al."Simultaneous Fractionation, Desalination, and Dye Removal of Dye/Salt Mixtures by Carbon Cloth-Modified Flow-electrode Capacitive Deionization".ENVIRONMENTAL SCIENCE & TECHNOLOGY 56(2022):8885-8896.