電容去離子是具有潛力的海水淡化技術，它可以在低伏特電壓、低溫與低能量消耗下將海水淡化。為了獲得最佳的電荷吸附，電極應具有良好的導電性、高表面積、優良的潤濕性以及多中孔結構，其中以中孔結構可有效提供離子傳遞的路徑。在本研究中，三維結構的石墨烯的製備是使用微波並加上水熱法生成三維還原氧化石墨稀 (3D rGO，以Gr-Mw-Hyd命名)。以SEM, TEM, Raman, FTIR, XPS, XRD與BET分析樣品的物理特性。結果顯示三維石墨烯(Gr-Mw-Hyd)樣品在濃度約500 mg/L氯化鈉溶液中擁有良好的比電容 (189.2 F/g)與超高電荷吸附能力(28.5 mg/g)。這顯示Gr-Mw-Hyd樣品比其他只用水熱法(Gr-Hyd)或迴流法(Gr-Reflux)製備的樣品有更低的電阻以及更高的導電性。因此，三維石墨烯(Gr-Mw-Hyd)電極未來具有相當高的潛力被應用於電容去離子技術

Capacitive deionization (CDI) is a prospective desalination technology, which can be operated at low voltage, low temperature and potentially consume low energy for brackish water desalination. To obtain the optimal electrosorption, an electrode should possess high electrical conductivity, large surface area, good wettability, highly mesoporous structure which provide efficient pathways for ion distribution. In this study, a 3D structure graphene was fabricated using hydrothermal method which is assisted with microwave treatments to form 3D rGO (Gr-Mw-Hyd). Physical characterizations such as SEM, TEM, Raman, FTIR, XPS, XRD, and BET have been used to study the physicochemical properties of the samples. Among them, the Gr-Mw-Hyd samples have excellent specific capacitance (189.2 F/g) and ultrahigh electrosorption capacity (28.5 mg/g) for the desalination of ca. 500 mg/L NaCl. This may be attributed to the fact that Gr-Mw-Hyd samples have lower resistance and higher conductivity than other samples which are fabricated by only using hydrothermal method without microwave assistance (Gr-Hyd) and traditional reflux method (Gr-Reflux). Therefore, the prepared Gr-Mw-Hyd samples may be one of promising electrode for CDI in the practical applications

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