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Chemosphere ; 208: 131-138, 2018 Oct.
Artículo en Inglés | MEDLINE | ID: mdl-29864704

RESUMEN

This work describes the electrochemical degradation of Reactive Black 5 (RB5) by two methods: electrochemical and photo-assisted electrochemical degradation with and without a Fenton reagent. Two anodes were used, Pt and boron-doped diamond (BDD, 2500 ppm), and the cathode was 3% MnO2 nanoflowers (NFMnO2) on a carbon gas diffusion electrode (GDE). An electrochemical cell without a divider with a GDE with 3% w/w NFMnO2/C supported on carbon Vulcan XC72 was used. The decolorization efficiency was monitored by UV-vis spectroscopy, and the degradation was monitored by Total Organic Carbon (TOC) analysis. For dissolution monitoring, aliquots (1 mL) were collected during the degradation. After 6 h of H2O2 electrogeneration, the manganese concentration in the RB5 solution was only 23.1 ±â€¯1.2 µg L-1. It was estimated that approximately 60 µg L-1 (<0.2%) of manganese migrated from the GDE to the solution after 12 h of electrolysis, which indicated the good stability of the GDE. The photoelectro-Fenton-BDD (PEF-BDD) processes showed both the best color removal percentage (∼93%) and 91% of mineralization. The 3% NFMnO2/C GDE is promising for RB5 degradation.


Asunto(s)
Colorantes/química , Electrólisis , Peróxido de Hidrógeno/química , Hierro/química , Compuestos de Manganeso/química , Naftalenosulfonatos/química , Óxidos/química , Contaminantes Químicos del Agua/química , Boro/química , Colorantes/aislamiento & purificación , Diamante/química , Electrodos , Naftalenosulfonatos/aislamiento & purificación , Oxidación-Reducción , Contaminantes Químicos del Agua/aislamiento & purificación
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