ELECTROCHEMICAL INCINERATION OF SHORT-CHAIN CARBOXYLIC ACIDS WITH NB‑SUPPORTED BORON DOPED DIAMOND ANODE: SUPPORTING ELECTROLYTE EFFECT INTO THE ELECTROGENERATED OXIDANT SPECIES (HYDROXYL RADICALS, HYDROGEN PEROXIDE AND PERSULFATE)
| Autor: | Dayanne Chianca de Moura, Jorge Leandro Aquino de Queiroz, Bernardo A. Frontana-Uribe, Elaine Cristina M. de Moura Santos, Carlos A. Martínez-Huitle |
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| Jazyk: | angličtina |
| Rok vydání: | 2020 |
| Předmět: |
carboxylic acids
Supporting electrolyte 020209 energy Inorganic chemistry Electrochemical kinetics electrooxidation 02 engineering and technology Electrolyte Electrochemistry law.invention lcsh:Chemistry chemistry.chemical_compound 020401 chemical engineering law Oxidizing agent 0202 electrical engineering electronic engineering information engineering 0204 chemical engineering Hydrogen peroxide Electrolysis oxidants Chemistry General Chemistry Persulfate boron doped diamond supporting electrolyte lcsh:QD1-999 |
| Zdroj: | Química Nova v.43 n.3 2020 Química Nova Sociedade Brasileira de Química (SBQ) instacron:SBQ Química Nova, Volume: 43, Issue: 3, Pages: 253-260, Published: 01 JUN 2020 Química Nova, Vol 43, Iss 3, Pp 253-260 |
| Popis: | This work describes the electrochemical oxidation study of three short chain carboxylic acids (acetic, oxalic and formic 0.18 mol L-1) using different electrolysis conditions (electrolyte composition and current density) in an electrochemical reactor fitted with niobiumsupported/BDD electrode (Nb/BBD) as anode and titanium plate as cathode. The experiments were focused to elucidate if the oxidation of these carboxylic acids involved a direct or a mediated oxidation pathway, as well as their electrochemical incineration efficiency using this electrochemical reactor. The amount of oxidizing species (hydroxyl radicals, hydrogen peroxide, and persulfate) produced at Nb/BDD electrode was spectroscopically determined. The electrochemical kinetics study in H2SO4 and HClO4 solutions, as well as the chemical oxygen demand and total organic carbon analysis for each one of the carboxylic acids studied in both media, gave us information to propose a degradation mechanism for the electrochemical degradation of the carboxylic acids in each electrolytic media. The degradation in H2SO4 is promoted by the persulfate production, whereas in HClO4 by •OH. |
| Databáze: | OpenAIRE |
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