Unexpected toxicity decrease during photoelectrochemical degradation of atrazine with NaCl |
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Authors: | Geoffroy R P Malpass Douglas W Miwa Ricardo L Santos Eny M Vieira Artur J Motheo |
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Institution: | (1) Department of Chemical Engineering, Institute of Technological and Exact Sciences, Federal University of Tri?ngulo Mineiro, Avenida Doutor Randolfo Borges J?nior, 1250, Univerdecidade, Uberaba, MG, CEP 38064-200, Brazil;(2) Department of Physical Chemistry, S?o Carlos Chemistry Institute, University of S?o Paulo, P.O. Box 780, S?o Carlos, S?o Paulo, CEP 13560-970, Brazil |
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Abstract: | This report shows an unexpected toxicity decrease during atrazine photoelectrodegradation in the presence of NaCl. Atrazine
is a pesticide classified as endocrine disruptor occurring in industrial effluents and agricultural wastewaters. We therefore
studied the effects of the degradation method, electrochemical and electrochemical photo-assisted, and of the supporting electrolyte,
NaCl and Na2SO4, on the residual toxicity of treated atrazine solutions. We also studied the toxicity of treated atrazine solutions using
Artemia nauplii. Results show that at initial concentration of 20 mg L−1, atrazine was completely removed in up to 30 min using 10 mA cm−2 electrolysis in NaCl medium, regardless of the electrochemical method used. The total organic carbon removal by the photo-assisted
method was 82% with NaCl and 95% with Na2SO4. The solution toxicity increased during sole electrochemical treatment in NaCl, as expected. However, the toxicity unexpectedly
decreased using the photo-assisted method. This finding is a major discovery because electrochemical treatment with NaCl usually
leads to the formation of toxic chlorine-containing organic degradation by-products. |
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