Sulfonated GO coated carbon electrodes with cation-selective functions for enhanced capacitive deionization of saltwater

doi:10.1080/09593330.2022.2153748

機構典藏 > College of Engineering > Graduate Institute & Department of Water Resources and Environmental Engineering > Journal Article > Item 987654321/124316

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Title:	Sulfonated GO coated carbon electrodes with cation-selective functions for enhanced capacitive deionization of saltwater
Authors:	Cheng, H.-C.;Chen, P.-A.;Peng, C.-Y.;Liu, S.-H.;Wang, H. Paul
Keywords:	Desalination;capacitive deionization;cation exchange membrane;sulfonated graphene oxide
Date:	2022-12-19
Issue Date:	2023-07-28 12:05:40 (UTC+8)
Abstract:	Deionization of salt, contaminated underground and inorganic waste waters for water recycling and reuse is of increasing importance mainly due to the shortage of freshwater worldwide. Membrane capacitive deionization (MCDI) possessing a high electrosorption capacity and energy efficiency has been considered a promising method for desalination. However, the MCDI reaction system has limited applications because of the high interfacial resistance during operation. In the present work, the novel sulfonated graphene oxide (SGO) serving as a hydrophilic cation exchange membrane that was coated directly on the activated carbon (AC) electrode was prepared to enhance capacitive deionization of saltwater. Experimentally, the electrosorption capacity and charge efficiency of the AC/SGO (negative)\|\|AC (positive) electrode pair using the coated SGO thin film increased from 12.8 to 19.8 mg/g and 56.7 to 89.3%, respectively. The enhancements were associated with the reduction of the co-ion effect during electrosorption. The strong negative PhSO3- group grafted on the SGO thin film could selectively accelerate the transport rate of cations during CDI. The increase of the charge efficiency also led to lower implemented current. This work demonstrates a simple, low-cost and effective desalination method that will likely have many new applications especially in water recycling and reuse.
Relation:	Environmental Technology
DOI:	10.1080/09593330.2022.2153748
Appears in Collections:	[Graduate Institute & Department of Water Resources and Environmental Engineering] Journal Article

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