Journal
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
Volume 26, Issue 5, Pages 4415-4425Publisher
SPRINGER HEIDELBERG
DOI: 10.1007/s11356-018-2024-0
Keywords
Electro-Fenton; Isoniazid; Oxidation products; Photoelectro-Fenton; Real wastewater; Water treatment
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Funding
- Fundacao de Apoio ao Desenvolvimento do Ensino
- Ciencia e Tecnologia do Estado de Mato Grosso do Sul (FUNDECT-MS)
- Pro-Reitoria de Pesquisa e Pos-Graduacao da Universidade Federal de Mato Grosso do Sul (PROPP-UFMS)
- Coordenacao de Aperfeicoamento de Pessoal de Nivel Superior (CAPES)
- Conselho Nacional de Desenvolvimento Cientifico e Tecnologico (CNPQ)
- AEI/FEDER, EU [CTQ2016-78616-R]
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Solutions with 0.65 mM of the antituberculosis drug isoniazid (INH) in 0.050 M Na2SO4 at pH 3.0 were treated by electro-Fenton (EF) and UVA photoelectro-Fenton (PEF) processes using a cell with a BDD anode and a carbon-PTFE air-diffusion cathode. The influence of current density on degradation, mineralization rate, and current efficiency has been thoroughly evaluated in EF. The effect of the metallic catalyst (Fe2+ or Fe3+) and the formation of products like short-chain linear aliphatic carboxylic acids were assessed in PEF. Two consecutive pseudo-first-order kinetic regions were found using Fe2+ as catalyst. In the first region, at short time, the drug was rapidly oxidized by (OH)-O-au, whereas in the second region, at longer time, a resulting Fe(III)-INH complex was much more slowly removed by oxidants. INH disappeared completely at 300 min by EF, attaining 88 and 94% mineralization at 66.6 and 100 mA cm(-2), respectively. Isonicotinamide and its hydroxylated derivative were identified as aromatic products of INH by GC-MS and oxalic, oxamic, and formic acids were quantified by ion-exclusion HPLC. The PEF treatment of a real wastewater polluted with the drug led to slower INH and TOC abatements because of the parallel destruction of its natural organic matter content.
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