Reduction of nitrite by sulfamic acid and sodium azide from aqueous solutions treated by gliding arc discharge

被引:41
作者
Marouf-Khelifa, Kheira
Abdelmalek, Fatiha
Khelifa, Amine
Belhadj, Mohamed
Addou, Ahmed
Brisset, Jean-Louis
机构
[1] Univ Mostaganem, Dept Chim, Lab Struct Elaborat & Applicat Mat Mol, Mostaganem 27000, Algeria
[2] Univ Mostaganem, Dept Chim, Lab STEVA, Mostaganem 27000, Algeria
[3] Univ Rouen, UFR Sci & Tech, LEICA, F-76821 Mont St Aignan, France
关键词
nitrite; kinetics of reduction; sulfamic acid; sodium azide; gliding arc discharge;
D O I
10.1016/j.seppur.2005.12.012
中图分类号
TQ [化学工业];
学科分类号
0817 ;
摘要
Nitrous and nitric acids form in aqueous solutions exposed to a gliding arc discharge burning in humid air. The anions interfere when the concentration of particular solutes such as pollutants must be determined. In particular they falsify the COD measurements and spectral investigations and thus the efficiency of the plasma treatment in pollutant abatement. The nitrite anions must be thus removed, which require specific reagents. The influence of parameters such as solution pH and [reducers]/[NO2-] ratio on the reduction reaction was evaluated. The reduction of nitrite into N-2 either by sulfamic acid or sodium azide is a first-order pH-dependant reaction with regard to nitrite and reducers (k(1) = 2.93 x 10(-1) m(3) kmol(-1) s(-1); k(2) = 6.21 x 10(-1) m(3) kmol(-1) s(-1), respectively). Sodium azide is thus more reactive than sulfamic acid. (c) 2006 Elsevier B.V. All rights reserved.
引用
收藏
页码:373 / 379
页数:7
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