The removal of ammonium ion via the capacitive deionization using the carbon aerogel electrodes

• Main Authors: HSIU-JU,HSU, 許琇茹
• Other Authors: 秦靜如
• Format: Others
• Language: zh-TW
• Published: 2016
• Online Access: http://ndltd.ncl.edu.tw/handle/81653865476685425128

碩士 === 國立中央大學 === 環境工程研究所 === 104 === 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.