Direct and mediated electrochemical oxidation of ammonia on boron-doped diamond electrode

作者：Kapalka Agnieszka^*; Joss Lisa; Anglada Angela; Comninellis Christos; Udert Kai M

来源：Electrochemistry Communications, 2010, 12(12): 1714-1717.

DOI：10.1016/j.elecom.2010.10.004

• Boron-doped diamond (BDD)
• Ammonia
• Free active chlorine
• Chlorate
• Chloramines

Direct (non-mediated) electrochemical oxidation of ammonia on boron-doped diamond (BDD) electrode proceeds mainly at high pH (>8) via free ammonia (NH(3)) oxidation. To enhance ammonia oxidation on BDD at low pH (<8), where mainly ammonium (NH(4)(+)) is present, oxidation of ammonia was mediated by active free chlorine. In this process, electro-generated in situ active chlorine rapidly reacts with ammonia instead of being further electro-oxidized to chlorate at the electrode surface. Thus, active chlorine effectively removes ammonia from an acidic solution, while the formation of by-products such as chlorate and possibly perchlorate is minimized.

• 出版日期2010-12