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|Electrochemical destruction of trans-cinnamic acid by advanced oxidation processes: kinetics, mineralization, and degradation route
|Flores Tapia, Nelly Esther
Rodríguez González, Rosa Ma.
Centellas Masuet, Francesc A.
Cabot Julià, Pere-Lluís
Garrido Ponce, José Antonio
Sirés Sadornil, Ignacio
Depuració de l'aigua
|Acidic solutions of trans-cinnamic acid at pH 3.0 have been comparatively treated by anodic oxidation with electrogenerated H2O2 (AO-H2O2), electro-Fenton (EF) and photoelectro-Fenton (PEF). The electrolytic experiments were carried out with a boron-doped diamond (BDD)/air-diffusion cell. The substrate was very slowly abated by AO-H2O2 because of its low reaction rate with oxidizing ¿OH produced from water discharge at the BDD anode. In contrast, its removal was very rapid and at similar rate by EF and PEF due to the additional oxidation by ¿OH in the bulk, formed from Fenton's reaction between cathodically generated H2O2 and added Fe2+. The AO-H2O2 treatment yielded the lowest mineralization. The EF process led to persistent final products like Fe(III) complexes, which were quickly photolyzed upon UVA irradiation in PEF to give an almost total mineralization with 98% total organic carbon removal. The effect of current density and substrate concentration on all the mineralization processes was examined. GC-MS analysis of electrolyzed solutions allowed identifying five primary aromatics and one heteroaromatic molecule, whereas final carboxylic acids like fumaric, acetic and oxalic were quantified by ion-exclusion HPLC. From all the products detected, a degradation route for trans-cinnamic acid is proposed.
|Versió postprint del document publicat a: https://doi.org/10.1007/s11356-015-6035-9
|It is part of:
|Environmental Science and Pollution Research, 2017, vol. 24, num. 7, p. 6071-6082
|Appears in Collections:
|Articles publicats en revistes (Ciència dels Materials i Química Física)
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