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年度	111	專案性質	實驗性質
專案類別	研究專案	研究主題	整治
申請機構	淡江大學學校財團法人淡江大學	申請系所	水資源及環境工程學系
專案主持人	彭晴玉	職等/職稱	助理教授
專案中文名稱	奈米鐵/活性碳流動電極電容去離子系統整治含砷地下水
中文關鍵字	砷, 流動電極, 電容去離子, 奈米鐵, 活性碳
專案英文名稱	Nano Iron/Activated Carbons Flow-Electrode Capacitive Deionization System for Arsenic Remediation in Groundwater
英文關鍵字	Arsenic, flow-electrode, capacitive deionization, nano iron, activated carbon
執行金額	800,000元
執行期間	2022/5/1 至 2023/4/30
計畫中文摘要	地下水之砷污染將影響地下水作為農業灌溉或飲用水源之應用，如何有效整治地下水的砷污染值得關注。本研究提出新穎的流動電極電容去離子系統(Flow-Electrode Capacitive Deionization, FCDI)應用於整治地下水之砷污染。 研究中測試四種流動式電極材料，發現最適合應用於FCDI系統去除砷之流動式電極材料為Fe3O4/AC複合材料；Fe3O4/AC 複合材料是由 230-240 nm 圓形奈米Fe3O4顆粒佈滿活性碳材料，Fe3O4保有¬¬立方尖晶石(spinel)結晶結構之(311)晶格面；Fe3O4/AC 複合材料的等溫吸脫附曲線屬於 Type IV- H4類型，BET 比表面積為740.14 m2/g，中孔佔總孔體積的比例(Vmeso/Vtot)為77.7%，比電容值為39.05 F/g (當掃描速率為1 mV/s)。 以5 wt% Fe3O4/AC複合材料為FCDI流動式電極材料，並以SCC操作模式與1.2 V操作時，FCDI系統擁有優異的As 平均鹽類去除速率(Average Salt Removal Rate (ASRR): 1.5× 10-5 mmol/min/cm2)，表現良好的As/Na選擇性(0.9)，較高的充電效率(22.1%)與較低的能源消耗(22.43 kWh/mole)，本研究水熱合成之Fe3O4/AC複合材料為深具潛力的去除水中砷之流動式電極材料。 FCDI系統處理不同砷濃度溶液時，顯示處理水中的砷濃度越高，可有最好的ASRR和最低的能源消耗；當溶液中有相同莫耳濃度之陰離子存在時，HCO3-的存在相較於Cl-或SO42-，明顯對帶負電荷的砷酸根離子(HAsO42-與H2AsO4-)造成更顯著的負面影響；Fe3O4/AC 複合材料可被清洗再次回收使用，但仍需更多次使用或更長期的回收再用之後續研究。
計畫英文摘要	Arsenic pollution in groundwaters will affect groundwater applications for agricultural irrigation and as drinking water sources. Effective remediation of arsenic pollution in groundwaters deserves more attention. This study is devoted to develop emerging technology of Flow-Electrode Capacitive Deionization (FCDI) system to remove arsenic pollution in groundwater. Four flow-electrode materials were examined in this study. Fe3O4/AC composite was found to be the most promising flow-electrode material for the FCDI system to remove As. Fe3O4/AC composite had 230-240 nm circular nanoparticles covered on AC, in which Fe3O4 remained cubic spinel structure with (311) crystalline phase. The adsorption-desorption isothermal curve of Fe3O4/AC composite was Type IV-H4 and its specific surface area was 740.14 m2/g with mesopore to total pore volume ratio (Vmeso/Vtot) of 77.7%. The specific capacitance of Fe3O4/AC composite was 39.05 F/g at the scan rate of 1 mV/s. 5 wt% Fe3O4/AC composite as FCDI flow-electrode material, operating in SCC mode and 1.2 V, possessed the outstanding As Average Salt Removal Rate (ASRR: 1.5× 10-5 mmol/min/cm2), good As/Na selectivity (0.9), higher charge efficiency (22.1%) and lower energy consumption (22.43 kWh/mole). This finding suggested that the hydrothermal synthesized Fe3O4/AC composite is the promising flow-electrode material for removal of As in water. Treating different levels of As solution with FCDI system indicated high level of As in solution can result in better ASRR and lower energy consumption. When same molar concentration of anions co-existed in the As solution, the existence of HCO3- comparing to Cl- or SO42- had more negative impact on negatively charged arsenate ions (HAsO42- and H2AsO4-). Fe3O4/AC composite can be cleaned and reused in FCDI system, but more studies are needed for multiple or long-term usage of reused Fe3O4/AC composite.