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

Direct (non-mediated) electrochemical oxidation of ammonia on boron-doped diamond (BDD) electrode proceeds mainly at high pH (>8) via free ammonia (NH3) oxidation. To enhance ammonia oxidation on BDD at low pH (<8), where mainly ammonium (NH4+) 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. (C) 2010 Elsevier B.V. All rights reserved.


Published in:
Electrochemistry Communications, 12, 1714-1717
Year:
2010
Publisher:
Elsevier
ISSN:
1388-2481
Keywords:
Laboratories:




 Record created 2010-10-19, last modified 2018-03-17


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