Study of the atenolol degradation using a Nb/BDD electrode in a filter-press reactor
| Autor: | Alan Nelson Arenhart Heberle, Andréa Moura Bernardes, Valentín Pérez-Herranz, E. Ortega, M. García-Gabaldón |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2019 |
| Předmět: |
Environmental Engineering
Supporting electrolyte Niobium Health Toxicology and Mutagenesis Radical 0208 environmental biotechnology Inorganic chemistry Kinetics Advanced anodic oxidation 02 engineering and technology 010501 environmental sciences 01 natural sciences Electrolysis INGENIERIA QUIMICA law.invention law Environmental Chemistry Electrodes 0105 earth and related environmental sciences Chemistry Boron doped diamond 06.- Garantizar la disponibilidad y la gestión sostenible del agua y el saneamiento para todos Public Health Environmental and Occupational Health Filter-press reactor General Medicine General Chemistry Persulfate Pollution 020801 environmental engineering Anode Atenolol Degradation (geology) Cyclic voltammetry |
| Zdroj: | RiuNet. Repositorio Institucional de la Universitat Politécnica de Valéncia instname |
| Popis: | [EN] The present paper deals with the atenolol (ATL) degradation by advanced anodic oxidation using a boron-doped diamond anode supported on niobium (Nb/BDD). Cyclic voltammetry performed on this electrode revealed that it presents a high quality (diamond-sp3/sp2-carbon ratio), high potential for OER and that ATL can be oxidized directly and/or indirectly by the electrogenerated oxidants, such as hydroxyl radicals, persulfate ions and sulfate radicals. Electrolysis experiments demonstrated that ATL degradation and mineralization follow a mixed (first and zero) order kinetics depending on the applied current density. At high applied current densities, the amount of OH radicals is very high and the overall reaction is limited by the transport of ATL (pseudo first-order kinetics) whereas for low applied current densities, the rate of OH radicals generation at the anode is slower than the rate of arrival of ATL molecules (pseudo-zero order kinetics). Estimated values of kzero and kfirst based on the assumption of pseudo-zero or pseudo-first order kinetics were carried oud as a function of the supporting electrolyte concentration, indicating that both parameters increased with its concentration due the higher production of sulfate reactive species that play an important role in degradation. Finally, MCE increased with the decrease of current density, due to the lower amount of OH present in solution, since this species could be rapidly wasted in parasitic reactions; and the increase of sulfate concentration due to the more efficient production of persulfate. The authors thank the financial support from the Ministerio de Economía y Competitividad (Spain) under projects CTQ2015-65202-C2-1-R and RTI2018-101341-B-C21, co-financed with FEDER funds. The authors thank to FAPERGS, CAPES, FINEP and CNPQ. |
| Databáze: | OpenAIRE |
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