Journal
CHEMOSPHERE
Volume 204, Issue -, Pages 163-169Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.chemosphere.2018.04.004
Keywords
Boron-doped diamond anode; Electrochemical oxidation; Sulfate radical; Persulfate; 2,4-Dichlorophenoxyacetic acid
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Funding
- French National Center for Scientific Research
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This research investigated persulfate electrosynthesis using a boron-doped diamond anode and a chemical reaction of persulfate in its activated form with an herbicide, 2,4-Dichlorophenoxyacetic acid (2,4-D). The first part of this research is dedicated to the influence of the applied current density on the electrosynthesis of persulfate. The first part shows that for a 2 M sulfuric acid, the current efficiency reached 96% for 5 mA/cm(2) and dropped to 52% for a higher current density (100 mA cm(-2)). This fall cannot be explained by mass transfer limitations: an increase in temperature (from 9 to 30 degrees C) during electrolysis leads to the decomposition of 23% of the persulfate. The second part of this research shows that a quasi-complete degradation of the target herbicide can be reached under controlled operating conditions: (i) a high ratio of initial concentrations [Persulfate]/12,4-D], (ii) a minimum temperature of 60 degrees C that produces sulfate radicals by heat decomposition of persulfate, and (iii) a sufficient contact time between reactants is required under dynamic conditions. (C) 2018 Elsevier Ltd. All rights reserved.
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