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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

Experimental-design-guided approach for the removal of atrazine by sono-electrochemical-UV-chlorine techniques

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Pinto, Camila Ferreira [1] ; Antonelli, Raissa [1] ; de Araujo, Karla Santos [1, 2] ; de Toledo Fornazari, Ana Luiza [2] ; Fernandes, David Maikel [2, 3] ; Granato, Ana Claudia [2] ; Azevedo, Eduardo Bessa [4] ; Pointer Malpass, Geoffroy Roger [1, 2]
Total Authors: 8
[1] Univ Fed Triangulo Mineiro, Multicentr Postgrad Program Chem Minas Gerai, Av Doutor Randolfo Borges Jr, 1400 Univerdecidade, BR-38064200 Uberaba, MG - Brazil
[2] Univ Fed Triangulo Mineiro, Profess Masters Program Technol Innovat, Av Doutor Randolfo Borges Jr, 1250 Univerdecidade, BR-38064200 Uberaba, MG - Brazil
[3] Univ Uberaba Uniube, Av Nene Sabino 1801, BR-38055500 Uberaba, MG - Brazil
[4] Univ Sao Paulo, Sao Carlos Inst Chem, Sao Carlos, SP - Brazil
Total Affiliations: 4
Document type: Journal article
Source: ENVIRONMENTAL TECHNOLOGY; v. 40, n. 4, p. 430-440, 2019.
Web of Science Citations: 1

The aim of the present study was to investigate the electrochemical formation of free chlorine species (HOCl/ClO-) and their subsequent use for the degradation of the pesticide atrazine. Initially, the process of electrochemical-free chlorine production was investigated using a bench-scale electrochemical flow-cell. The most significant variables (electrolyte concentration ({[}NaCl]) and inter-electrode gap) of the process were obtained using a 2(3) factorial design and the optimum process conditions (1.73molL(-1) and 0.56cm) were determined by a central composite design. Following optimization of free chlorine production, three degradation techniques were investigated, individually and in combination, for atrazine degradation: electrochemical, photochemical and sonochemical. The method using the techniques in combination was denominated sono-photo-assisted electrochemical degradation. Constant current assays were performed and the sono-photo-assisted electrochemical process promoted more efficient removal of atrazine, achieving total organic carbon removal of approximate to 98% and removal of atrazine to levels below the detection limit (>99%) in under 30min of treatment. Furthermore, the combination of three techniques displayed lower energy consumption, and phytotoxicity tests (Lactuca sativa) showed that there was no increase in toxicity. (AU)

FAPESP's process: 14/02739-6 - Water reuse in irrigation and aquaculture: inactivation of pharmaceuticals and endocrine disruptors by solar photo-fenton
Grantee:Eduardo Bessa Azevedo
Support type: Regular Research Grants