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The quantitative analysis of hydroxyl radical produced and intermediate products in the process of electrochemical oxidation for ammonia removal |
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Abstract In the process of electrochemical oxidation for ammonia removal, the concentration of hydroxyl radical (·OH) was detected and quantitatively analyzed by high performance liquid chromatography in different current density, chloride ion (Cl-)concentration and initial pH value. The concentration of ·OH produced was direct proportional to current density, and the production of ·OH would be inhibited under the conditions of existence of Cl- and alkaline. Meanwhile, the intermediates were detected and quantitatively analyzed by spectrophotometry and titration in different initial pH and current density. When the initial pH was alkaline, NO2- and chloramine, as noneffective intermediate products, would increase. Therefore, electrochemical oxidation of ammonia should be at neutral or acidic conditions. In addition, the current density had great effect on intermediates of the electrochemical oxidation of ammonia. Higher active substances and lower harmful intermediate products yielded at current density of 10mA/cm2.
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Received: 29 April 2011
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