Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
579913 | Journal of Hazardous Materials | 2011 | 8 Pages |
Abstract
The beta-blocker propranolol hydrochloride has been degraded by electrochemical advanced oxidation processes like electro-Fenton (EF) and photoelectro-Fenton (PEF) using a single cell with a Pt anode and an air diffusion cathode (ADE) for H2O2 electrogeneration and a combined system containing the above Pt/ADE pair coupled in parallel to a Pt/carbon-felt (CF) cell. Organics are mainly oxidized with hydroxyl radical (OH) formed from Fenton's reaction between added Fe2+ and electrogenerated H2O2. The PEF treatment in Pt/ADE-Pt/CF system yields almost total mineralization because OH production is enhanced by Fe2+ regeneration from Fe3+ reduction at the CF cathode and Fe(III) complexes with generated carboxylic acids are rapidly photodecarboxylated under UVA irradiation. Lower mineralization degree is found for PEF in Pt/ADE cell due to the little influence of UVA light on Fe2+ regeneration. The homologous EF processes are much less potent as a result of the persistence of Fe(III)-carboxylate complexes. Aromatic intermediates such as 1-naphthol, 1,4-naphthoquinone and phthalic acid and generated carboxylic acids such as pyruvic, glycolic, malonic, maleic, oxamic, oxalic and formic are identified. While chloride ion remains stable, NH4+ and NO3â ions are released to the medium. A reaction sequence for propranolol hydrochloride mineralization is proposed.
Keywords
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Physical Sciences and Engineering
Chemical Engineering
Chemical Health and Safety
Authors
Eloy Isarain-Chávez, Pere LluÃs Cabot, Francesc Centellas, Rosa MarÃa RodrÃguez, Conchita Arias, José Antonio Garrido, Enric Brillas,