Salt Removal by Chemically Modified Graphene in Capacitive Deionization (CDI)

doi:10.3390/w14091379

淡江大學機構典藏 > 工學院 > 水資源及環境工程學系暨研究所 > 期刊論文 > Item 987654321/125302

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题名:	Salt Removal by Chemically Modified Graphene in Capacitive Deionization (CDI)
作者:	Peng, Ching-Yu;Chen, Yi-Fang;Wang, Ching-Yi
关键词:	capacitive deionization (CDI);graphene;chemical modification;strong acid;sulfonation
日期:	2022-04-24
上传时间:	2024-03-14 12:05:20 (UTC+8)
出版者:	MDPI AG
摘要:	Obtaining clean water from salt water by capacitive deionization (CDI) with chemically modified graphene (rGO) was explored in this study. Strong acid (HNO3:H2SO4 = 2:1) was employed to modify rGO to enhance its hydrophilicity and electrochemical properties. Characteristics of rGO with/without acid modification were analyzed by XRD, SEM, FTIR, contact angle, BET, and cyclic voltammetry (CV). Contributions of sulfonic acid groups, hydroxyl groups, and NO2 stretching after acid modification resulted in better wettability and higher specific capacitance of rGO. The contact angle for rGO dropped from 84.9° to 35.1° (am-rGO), indicating improved hydrophilicity of rGO with acid modification. The specific capacitance of am-rGO can reach 150.2 F/g at the scan rate of 1 mV/s. The average NaCl electrosorption capacity of the CDI process with am-rGO was 0.63 mg NaCl/g electrode (10.86 μmol NaCl/g electrode), which indicated rGO with acid modification can enhance the electrosorption capacity by 3.9 times. This study demonstrated that chemical modification can significantly improve the hydrophilicity, electrochemical properties, and electrosorption performance of rGO, which has potential for applications to other carbon-based materials for CDI systems to improve salt removal efficiency.
關聯:	Water 14(9), 1379
DOI:	10.3390/w14091379
显示于类别:	[水資源及環境工程學系暨研究所] 期刊論文

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