Journal
ENVIRONMENTAL SCIENCE & TECHNOLOGY
Volume 57, Issue 36, Pages 13658-13668Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acs.est.3c02751
Keywords
hexavalent chromium; low-pressure membranes; adsorption; regeneration; electrical control; electrostatic interaction
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In this study, an electrically controlled adsorptive membrane (ECAM-L) was prepared for efficient removal of Cr(VI) in water. The adsorption and desorption of Cr(VI) were modulated by varying the electrostatic interactions between ECAM-L and Cr(VI), enabling its cyclic use without additional additives.
Ionic contaminants such as Cr(VI) pose a challenge for water purification using membrane-based processes. However, existing membranes have low permeability and selectivity for Cr(VI). Therefore, in this study, we prepared an electrically controlled adsorptive membrane (ECAM-L) by coating a loose Cl--doped polypyrrole layer on a carbon nanotube substrate, and we evaluated the performance of ECAM-L for Cr(VI) separation from water. We also used electrochemical quartz crystal microbalance measurements and molecular dynamics and density functional theory calculations to investigate the separation mechanisms. The adsorption and desorption of Cr(VI) could be modulated by varying the electrostatic interactions between ECAM-L and Cr(VI) via potential control, enabling the cyclic use of the ECAM-L without additional additives. Consequently, the oxidized ECAM-L showed high Cr(VI) removal performance (<50 mu g/L) and treatment capacity (>3500 L/m(2)) at a high water flux (283 L/m(2)/h), as well as reusability after the application of a potential. Our study demonstrates an efficient membrane design for water decontamination that can selectively separate Cr(VI) through a short electric stimulus.
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