Application and stability of cathodes with manganese dioxide nanoflowers supported on Vulcan by Fenton systems for the degradation of RB5 azo dye
| Autor: | Luanna S. Parreira, Rodrigo Papai, M.C. Santos, Ivanise Gaubeur, Luci R. Aveiro, Eduardo G Candido, Marcos R.V. Lanza, Fernando L. Silva, Pedro H. C. Camargo, V. S. Antonin, A. G. M. da Silva |
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| Rok vydání: | 2018 |
| Předmět: |
Environmental Engineering
Materials science ELETROQUÍMICA Health Toxicology and Mutagenesis Iron chemistry.chemical_element 02 engineering and technology Manganese 010402 general chemistry Electrochemistry 01 natural sciences Electrolysis Electrochemical cell law.invention Naphthalenesulfonates law Environmental Chemistry Coloring Agents Dissolution Electrodes Boron Gas diffusion electrode Public Health Environmental and Occupational Health Oxides General Medicine General Chemistry Hydrogen Peroxide 021001 nanoscience & nanotechnology Pollution Cathode 0104 chemical sciences chemistry Manganese Compounds Degradation (geology) Diamond 0210 nano-technology Carbon Oxidation-Reduction Water Pollutants Chemical Nuclear chemistry |
| Zdroj: | Repositório Institucional da USP (Biblioteca Digital da Produção Intelectual) Universidade de São Paulo (USP) instacron:USP |
| ISSN: | 1879-1298 |
| Popis: | 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 ± 1.2 μg L−1. It was estimated that approximately 60 μg L−1 ( |
| Databáze: | OpenAIRE |
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