Efficient Electrochemical Removal of Ammonia with Various Cathodes and Ti/RuO<sub>2</sub>-Pt Anode
Efficient Electrochemical Removal of Ammonia with Various Cathodes and Ti/RuO<sub>2</sub>-Pt Anode作者机构：Graduate School of Life and Environmental Sciences University of Tsukuba Tsukuba Japan
出 版 物：《Open Journal of Applied Sciences》 (应用科学（英文）)
年 卷 期：2012年第2卷第4期
页 面：241-247页
主 题：Electrochemical Oxidation Ammonia Nitrate Cu/Zn Sodium Chloride
摘 要：Electrochemical oxidation of ammonia was studied with an objective to enhance the selectivity of ammonia to nitrogen gas and to remove the by-products in an undivided electrochemical cell, in which various cathodes and Ti/RuO 2-Pt anode were assembled. In the present study, anodic oxidation of ammonia and cathodic reduction of by-products were achieved, especially with Cu/Zn as cathode. In the presence of 1.0 g/L NaCl the ammonia-N decreased from 100.0 to 0 after 120 min electrolysis at current density of 30 mA/cm2, and no nitrite was detected in the treated solution. The lowest amount of nitrate was formed with Cu/Zn as cathode during electrolysis due to its high reduction ability. Initial pH range from 7 and 9 and uncontrolled temperature were favorable for electrochemical ammonia oxidation and the ammonia oxidation rates with Cu/Zn cathode was higher than that with Ti and Fe cathode. The reduction rate increased with increasing current density in the range of 5 - 50 mA/cm2. As ammonia could be completely removed by the simultaneous oxidation and reduction in this study, it is suitable for deep treatment of ammonia polluted water.
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