Carregant...
Fitxers
Tipus de document
ArticleVersió
Versió acceptadaData de publicació
Llicència de publicació
Si us plau utilitzeu sempre aquest identificador per citar o enllaçar aquest document: https://hdl.handle.net/2445/153303
Removal of 4-hydroxyphenylacetic acid from aqueous medium by electrochemical oxidation with a BDD anode: mineralization, kinetics and oxidation products
Títol de la revista
Director/Tutor
ISSN de la revista
Títol del volum
Recurs relacionat
Resum
The degradation of 100 mL of solutions containing 4-hydroxyphenylacetic acid in 0.050 M Na2SO4 at pH 3.0 has been performed by anodic oxidation with electrogenerated H2O2 (AO-H2O2) using a stirred tank reactor equipped with a boron-doped diamond (BDD) anode and an air-diffusion cathode. An almost total mineralization with 95.5% total organic carbon (TOC) removal was achieved for a 1.03 mM substrate solution at 100 mA cm-2. The effect of current density between 16.7 and 100 mA cm-2 and 4-hydroxyphenylacetic acid content between 0.21 and 2.06 mM was examined. Greater current efficiency with lower specific energy consumption and smaller mineralization was found at low current density and high substrate concentration. The TOC abatement as well as the 4-hydroxyphenylacetic acid concentration decay obeyed a pseudo-first-order kinetics. The oxidation role of hydroxyl radical formed from water discharge at the BDD anode is explained on the basis of its electrogeneration rate and competitive wasting reactions. 4-Hydroxybenzenemethanol and its derivative 4-hydroxybenzenealdehyde were identified as primary aromatic by-products by gas chromatography-mass spectrometry. Ion-exclusion HPLC allowed the detection of low amounts of the persistent oxalic acid during the AO-H2O2 process. The remaining TOC in final electrolyzed solutions is related to the presence of a large proportion of unidentified by-products that are even more recalcitrant than common short-linear aliphatic carboxylic acids.
Matèries (anglès)
Citació
Citació
FLORES TAPIA, Nelly esther, SIRÉS SADORNIL, Ignacio, RODRÍGUEZ GONZÁLEZ, Rosa ma., CENTELLAS MASUET, Francesc a., CABOT JULIÀ, Pere-lluís, GARRIDO PONCE, José antonio, BRILLAS, Enric. Removal of 4-hydroxyphenylacetic acid from aqueous medium by electrochemical oxidation with a BDD anode: mineralization, kinetics and oxidation products. _Journal of Electroanalytical Chemistry_. 2016. Vol. 793, núm. 58-65. [consulta: 22 de gener de 2026]. ISSN: 1572-6657. [Disponible a: https://hdl.handle.net/2445/153303]