2026-04-13T01:03:05Zhttps://recercat.cat/oai/request

oai:recercat.cat:2445/1651402025-12-04T20:57:30Zcom_2072_1057col_2072_478796col_2072_478917

00925njm 22002777a 4500 dc Thiam, Abdoulaye author Salazar, Ricardo author Brillas, Enric author Ignés i Mullol, Jordi author 2020-06-11T07:49:07Z 2022-06-02T05:10:17Z 2020-06-02 2020-06-11T07:49:07Z 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. Antibiòtics Catàlisi Oxidació electroquímica Antibiotics Catalysis Electrolytic oxidation In-situ dosage of Fe2+ catalyst using natural pyrite for thiamphenicol mineralization by photoelectro-Fenton process