隨著全球人口成長以及工業發展，水資源短缺問題逐漸惡化。海水佔地球水資源97%，發展海水淡化技術成為趨勢。電容去離子(capacitive deionization (CDI))是一種低耗能，低汙染的海水淡化技術，透過施加電場於兩電極之間，使電極表面形成電雙層吸附水中帶電荷之離子以達到淡化目的，CDI也可以應用在廢汙水以及受重金屬汙染地下水的淨化處鋰。
CDI效率受電極材料特性影響，例如：導電性、比表面積、親水性等，透過回收廢棕梠殼製成活性碳基材應用於CDI之電極材料，以掃描式電子顯微鏡(SEM)、穿透式電子顯微鏡(TEM)、X-光繞射(XRD)、傅立葉轉換紅外光譜(FTIR)、拉曼光譜、比表面積分析儀(BET)、循環伏安、電化學交流阻抗等方法進行特性分析，結果顯示以ZnCl2活化之活性碳可有效去除地下水中砷離子。
透過摻入石墨烯以及奈米Cu@C可提升活性碳電極導電性，增加離子吸附效率。實驗結果顯示研製的活性碳具有高達1160 m2/g的比表面積，製成之電極比電容值最高約為58.172 F/g，電極可透過移除電場或施以反向電壓進行反洗，可達到95%恢復率。本研究結果顯示以活性碳為基材製備的碳電極可有效對地下水、工業廢水以及模擬海水進行淡化，生成淡水。並可以簡易方式達成再生。

Fresh water shortage is a serious problem which is getting worse in recent decades. Desalination technologies is essential because of ocean has 97% of water resources on the earth. Capacitive deionization (CDI) is a promising technology has advantages of low energy consumption and environmental friendly. Ions can be removed from water by applying a potential different between two electrodes. The electrical double layer form on the electrodes surfaces can store the ions. CDI can also used to treat the contaminated underground water and diluted wastewater.
The CDI performance is influenced by the characteristics of electrode materials such as conductivity, specific surface area, and wetting ability. In this study, activated carbon (AC) (recovered from palm shell wastes) was used as CDI electrodes. To promote deionization efficiency, rGO and (Cu-ZnO)@C nanoparticles composite based electrodes were also used for CDI of contaminated underground, waste, and brackish waters (50-5000 mg/L). During repeated CDI, their regeneration abilities were investigated. The carbon electrodes can be regenerated by removing the voltage or reversing the polarity. For the high salinity water, the electrosorption becomes saturation in a short time. Nevertheless, the electrodes regenerated by reversing polarity possess a relatively slow step. The positive electrode surface may involve oxidation during CDI, which can be reduced by reversing the polarity.

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