Journal
ELECTROCHEMISTRY COMMUNICATIONS
Volume 12, Issue 12, Pages 1714-1717Publisher
ELSEVIER SCIENCE INC
DOI: 10.1016/j.elecom.2010.10.004
Keywords
Boron-doped diamond (BDD); Ammonia; Free active chlorine; Chlorate; Chloramines
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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.
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