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Journal of the Mexican Chemical Society

Print version ISSN 1870-249X

Abstract

BRAVO-YUMI, Nelson P.; ESPINOZA-MONTERO, Patricio; BRILLAS, Enric  and  PERALTA-HERNANDEZ, Juan M.. Electrochemical Abatement of Atrazine Solutions Using an Undivided Stirred Tank Cell with Pt or BDD Anode. J. Mex. Chem. Soc [online]. 2018, vol.62, n.2, pp.295-304. ISSN 1870-249X.  http://dx.doi.org/10.29356/jmcs.v62i2.367.

Nowadays, the increasing pollution of natural water effluents with herbicides, such as atrazine (ATZ, 2-chloro-4-ethylamino-6-isopropylamino-s-triazine), is an emerging problem that has not received the sufficient attention. This work presents a study on ATZ degradation under an electrochemical advanced oxidation process (EAOP), such as anodic oxidation (AO). The degradation of 175 mL of 10 and 40 mg L-1 ATZ solutions was studied using Pt or BDD as anode. The assays were made with a stirred tank cell, using a supporting electrolyte of 0.050 mM of Na2SO4 at pH 3.0 by applying 0.18, 0.27 and 0.37 A cm-2. The degradation rate increased by increasing current density, regardless of the anode employed. Greater amounts of ATZ were removed at higher organic load. The pesticide decay always obeyed a pseudo-first-order kinetics. A high degradation efficiency of 97%-99% was obtained by the more powerful AO-BDD process at 0.37 A cm-2. High performance liquid chromatography (HPLC) was used to follow the evolution of major oxidation products by AO-BDD, such as desethyl atrazine, desethyl desisopropyl atrazine and cyanuric acid.

Keywords : Anodic oxidation; Atrazine; BDD; Pt; Water treatment.

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