In-situ dosage of Fe2+ catalyst using natural pyrite for thiamphenicol mineralization by photoelectro-Fenton process

JOURNAL OF ENVIRONMENTAL MANAGEMENT

卷:270

Article

Thiam, Abdoulaye¹  Salazar, Ricardo²  Brillas, Enric³  Sires, Ignasi³ 

[1] Univ Tecnol Metropolitana, Programa Inst Fomento IDi, Ignacio Valdivieso 2409,POB 8940577, Santiago, Chile

[2] Univ Santiago Chile, Fac Quim & Biol, Lab Electroquim Medio Ambiente, USACh,LEQMA, Casilla 40,Correo 33, Santiago, Chile

[3] Univ Barcelona, Dept Quim Fis, Lab Electroquim Mat & Medi Ambient, Marti I Franques 1-11, Barcelona 08028, Spain

关键词: Antibiotic;    Catalyst dosage;    Electrochemical technology;    Emerging contaminants;    Heterogeneous photoelectroTenton;    Water treatment;   

DOI  :  10.1016/j.jenvman.2020.110835

来源: Elsevier

【 摘 要 】

The degradation of the antibiotic thiamphenicol has been studied by photoelectm-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 center dot 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, electm-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.

【 授权许可】

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