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In-situ dosage of Fe2+ catalyst using natural pyrite for thiamphenicol mineralization by photoelectro-Fenton process.
Thiam, Abdoulaye; Salazar, Ricardo; Brillas, Enric; Sirés, Ignasi.
Affiliation
  • Thiam A; Programa Institucional de Fomento a la I+D+i, Universidad Tecnológica Metropolitana, Ignacio Valdivieso 2409, P.O. Box 8940577, San Joaquín, Santiago, Chile.
  • Salazar R; Laboratorio de Electroquímica del Medio Ambiente, LEQMA, Facultad de Química y Biología, Universidad de Santiago de Chile, USACh, Casilla 40, Correo 33, Santiago, Chile.
  • Brillas E; Laboratori d'Electroquímica dels Materials i del Medi Ambient, Departament de Química Física, Universitat de Barcelona, Martí i Franquès 1-11, 08028, Barcelona, Spain.
  • Sirés I; Laboratori d'Electroquímica dels Materials i del Medi Ambient, Departament de Química Física, Universitat de Barcelona, Martí i Franquès 1-11, 08028, Barcelona, Spain. Electronic address: i.sires@ub.edu.
J Environ Manage ; 270: 110835, 2020 Sep 15.
Article in En | MEDLINE | ID: mdl-32501237
The degradation of the antibiotic thiamphenicol has been studied by photoelectro-Fenton (PEF) process with UVA light using pyrite particles as catalyst source. Pyrite is a sulfide mineral that naturally acidifies the reaction medium and releases Fe2+, thus promoting the effective generation of OH from Fenton's reaction. The assays were made in an IrO2/air-diffusion cell, which yielded similar results to a boron-doped diamond (BDD)/air-diffusion one at a lower cost. In dark conditions, electro-Fenton (EF) process showed an analogous ability for drug removal, but mineralization was much poorer because of the large persistence of highly stable by-products. Their photolysis explained the higher performance of PEF. Conventional homogeneous PEF directly using dissolved Fe2+ exhibited a lower mineralization power. This suggests the occurrence of heterogeneous Fenton's reaction over the pyrite surface. The effect of current density and drug content on pyrite-catalyzed PEF performance was examined. The drug heteroatoms were gradually converted into SO42-, Cl- and NO3- ions. Nine aromatic derivatives and two dichloroaliphatic amines were identified by GC-MS, and five short-chain carboxylic acids were detected by ion-exclusion HPLC. A reaction route for thiamphenicol mineralization by PEF process with continuous H2O2 and Fe2+ supply on site is proposed.
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Full text: 1 Collection: 01-internacional Database: MEDLINE Main subject: Thiamphenicol / Water Pollutants, Chemical Language: En Journal: J Environ Manage Year: 2020 Document type: Article Affiliation country: Chile Country of publication: United kingdom

Full text: 1 Collection: 01-internacional Database: MEDLINE Main subject: Thiamphenicol / Water Pollutants, Chemical Language: En Journal: J Environ Manage Year: 2020 Document type: Article Affiliation country: Chile Country of publication: United kingdom