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Mineralization of salicylic acid in acidic aqueous medium by electrochemical advanced oxidation processes using platinum and boron-doped diamond as anode and cathodically generated hydrogen peroxide.
Water Res. 2008 Jan; 42(1-2):499-511.WR

Abstract

Solutions containing 164 mg L(-1) salicylic acid of pH 3.0 have been degraded by electrochemical advanced oxidation processes such as anodic oxidation, anodic oxidation with electrogenerated H(2)O(2), electro-Fenton, photoelectro-Fenton and solar photoelectro-Fenton at constant current density. Their oxidation power has been comparatively studied in a one-compartment cell with a Pt or boron-doped diamond (BDD) anode and a graphite or O(2)-diffusion cathode. In the three latter procedures, 0.5mM Fe(2+) is added to the solution to form hydroxyl radical (()OH) from Fenton's reaction between Fe(2+) and H(2)O(2) generated at the O(2)-diffusion cathode. Total mineralization is attained for all methods with BDD and for photoelectro-Fenton and solar photoelectro-Fenton with Pt. The poor decontamination achieved in anodic oxidation and electro-Fenton with Pt is explained by the slow removal of most pollutants by ()OH formed from water oxidation at the Pt anode in comparison to their quick destruction with ()OH produced at BDD. ()OH generated from Fenton's reaction oxidizes rapidly all aromatic pollutants, but it cannot destroy final Fe(III)-oxalate complexes. Solar photoelectro-Fenton treatments always yield quicker degradation rate due to the very fast photodecarboxylation of these complexes by UVA irradiation supplied by solar light. The effect of current density on the degradation rate, efficiency and energy cost of all methods is examined. The salicylic acid decay always follows a pseudo-first-order kinetics. 2,3-Dihydroxybenzoic, 2,5-dihydroxybenzoic, 2,6-dihydroxybenzoic, alpha-ketoglutaric, glycolic, glyoxylic, maleic, fumaric, malic, tartronic and oxalic acids are detected as oxidation products. A general reaction sequence for salicylic acid mineralization considering all these intermediates is proposed.

Authors+Show Affiliations

Laboratori d'Electroquímica dels Materials i del Medi Ambient, Departament de Química Física, Facultat de Química, Universitat de Barcelona, Martí i Franquès 1-11, 08028 Barcelona, Spain.No affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info available

Pub Type(s)

Journal Article
Research Support, Non-U.S. Gov't

Language

eng

PubMed ID

17692891

Citation

Guinea, Elena, et al. "Mineralization of Salicylic Acid in Acidic Aqueous Medium By Electrochemical Advanced Oxidation Processes Using Platinum and Boron-doped Diamond as Anode and Cathodically Generated Hydrogen Peroxide." Water Research, vol. 42, no. 1-2, 2008, pp. 499-511.
Guinea E, Arias C, Cabot PL, et al. Mineralization of salicylic acid in acidic aqueous medium by electrochemical advanced oxidation processes using platinum and boron-doped diamond as anode and cathodically generated hydrogen peroxide. Water Res. 2008;42(1-2):499-511.
Guinea, E., Arias, C., Cabot, P. L., Garrido, J. A., Rodríguez, R. M., Centellas, F., & Brillas, E. (2008). Mineralization of salicylic acid in acidic aqueous medium by electrochemical advanced oxidation processes using platinum and boron-doped diamond as anode and cathodically generated hydrogen peroxide. Water Research, 42(1-2), 499-511.
Guinea E, et al. Mineralization of Salicylic Acid in Acidic Aqueous Medium By Electrochemical Advanced Oxidation Processes Using Platinum and Boron-doped Diamond as Anode and Cathodically Generated Hydrogen Peroxide. Water Res. 2008;42(1-2):499-511. PubMed PMID: 17692891.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Mineralization of salicylic acid in acidic aqueous medium by electrochemical advanced oxidation processes using platinum and boron-doped diamond as anode and cathodically generated hydrogen peroxide. AU - Guinea,Elena, AU - Arias,Conchita, AU - Cabot,Pere Lluís, AU - Garrido,José Antonio, AU - Rodríguez,Rosa María, AU - Centellas,Francesc, AU - Brillas,Enric, Y1 - 2007/08/01/ PY - 2007/05/31/received PY - 2007/07/19/revised PY - 2007/07/24/accepted PY - 2007/8/19/pubmed PY - 2008/3/14/medline PY - 2007/8/19/entrez SP - 499 EP - 511 JF - Water research JO - Water Res. VL - 42 IS - 1-2 N2 - Solutions containing 164 mg L(-1) salicylic acid of pH 3.0 have been degraded by electrochemical advanced oxidation processes such as anodic oxidation, anodic oxidation with electrogenerated H(2)O(2), electro-Fenton, photoelectro-Fenton and solar photoelectro-Fenton at constant current density. Their oxidation power has been comparatively studied in a one-compartment cell with a Pt or boron-doped diamond (BDD) anode and a graphite or O(2)-diffusion cathode. In the three latter procedures, 0.5mM Fe(2+) is added to the solution to form hydroxyl radical (()OH) from Fenton's reaction between Fe(2+) and H(2)O(2) generated at the O(2)-diffusion cathode. Total mineralization is attained for all methods with BDD and for photoelectro-Fenton and solar photoelectro-Fenton with Pt. The poor decontamination achieved in anodic oxidation and electro-Fenton with Pt is explained by the slow removal of most pollutants by ()OH formed from water oxidation at the Pt anode in comparison to their quick destruction with ()OH produced at BDD. ()OH generated from Fenton's reaction oxidizes rapidly all aromatic pollutants, but it cannot destroy final Fe(III)-oxalate complexes. Solar photoelectro-Fenton treatments always yield quicker degradation rate due to the very fast photodecarboxylation of these complexes by UVA irradiation supplied by solar light. The effect of current density on the degradation rate, efficiency and energy cost of all methods is examined. The salicylic acid decay always follows a pseudo-first-order kinetics. 2,3-Dihydroxybenzoic, 2,5-dihydroxybenzoic, 2,6-dihydroxybenzoic, alpha-ketoglutaric, glycolic, glyoxylic, maleic, fumaric, malic, tartronic and oxalic acids are detected as oxidation products. A general reaction sequence for salicylic acid mineralization considering all these intermediates is proposed. SN - 0043-1354 UR - https://www.unboundmedicine.com/medline/citation/17692891/Mineralization_of_salicylic_acid_in_acidic_aqueous_medium_by_electrochemical_advanced_oxidation_processes_using_platinum_and_boron_doped_diamond_as_anode_and_cathodically_generated_hydrogen_peroxide_ L2 - https://linkinghub.elsevier.com/retrieve/pii/S0043-1354(07)00522-2 DB - PRIME DP - Unbound Medicine ER -