利用碳氣凝膠紙電容吸附處理水中銨離子之研究;The removal of ammonium ion via the capacitive deionization using the carbon aerogel electrodes

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Title:	利用碳氣凝膠紙電容吸附處理水中銨離子之研究;The removal of ammonium ion via the capacitive deionization using the carbon aerogel electrodes
Authors:	許琇茹;HSIU-JU,HSU
Contributors:	環境工程研究所
Keywords:	碳氣凝膠紙;電容去離子;電容吸附;銨離子;carbon aerogel;CDI;capacitance adsorption
Date:	2016-01-26
Issue Date:	2016-03-17 20:51:14 (UTC+8)
Publisher:	國立中央大學
Abstract:	廢污水之氨氮主要來自工業生產與生活污水，其對生態具有多方面的危害，包括耗用水中溶氧、產生臭味、與造成水體優氧化等，因此考量其對環境與生物健康有一定程度之危害，許多國家皆設立法令控制其排放許可濃度，且越來越嚴苛。本研究使用碳氣凝膠紙為電極，利用電容去離子機制去除銨離子。於研究中，使用循環伏安法來分析碳氣凝膠電極之電化學特性，結果顯示電容量最高約為38 F/g，當提升掃速時比電容量會下降，但電容圖形維持相似的形狀。在電容吸附批次系統中，當初始銨離子濃度為40 ppm且外加電壓從1.0 V上升至1.6 V時，銨離子的去除量從0.15 mg/g上升到1.85 mg/g；而銨離子濃度由10 ppm提高至40 ppm且外加電壓1.1 V或1.6 V時，提升濃度可使去除量增加，但1.1 V時會因吸附飽和量有限而使去除量無法持續提升。並在電容吸附研究中，發現硝酸根離子與亞硝酸根離子的產生，推測具有氧化還原反應發生。電極穩定性與再生性結果，以循環伏安法連續掃描電極三百次，其圖形不隨掃描次數改變，而電容吸附實驗反覆充放電三次的情形下，導電度具有相同的下降與上升趨勢，且下降的幅度維持一致。;Ammonium in wastewater are harmful to the environment for it is odorous, would consume oxygen and cause eutrophication. Therefore, the regulations on the ammonium have become stricter. This study focused on the removal of ammonium via the capacitive deionization using carbon aerogel electrodes. The electrochemical characteristics of carbon aerogel electrode were investigated vie cyclic voltammetry experiment. The results showed that the highest specific capacitance of carbon aerogel electrode is about 38 F/g. Removal of ammonium vie capacitive deionization were studied. The results showed that the removal amount of ammonium ion increases from 0.15 mg/g to 1.85 mg/g when the applied voltage increased from 1.0 V to 1.6 V with the initial ammonium ion concentration of 40 ppm. In the meantime, trace amount of nitrate and nitrite have been found, which may be due to the oxidation of ammonium ion. The stability of the electrode was established by repeating the cyclic voltammetry measurements at scan rate of 100 mV/s for 300 cycles, which showed 100 % retention. The carbon aerogel electrodes were regenerated in charge/discharge cycle, the conductivity profile suggested that the removal of ammonium ions was repeatedly for up to three cycles.
Appears in Collections:	[Graduate Institute of Environmental Engineering ] Electronic Thesis & Dissertation

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