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Electro-fenton and photoelectro-fenton degradation of sulfanilic acid using a boron-doped diamond anode and an air diffusion cathode.
J Phys Chem A. 2012 Apr 05; 116(13):3404-12.JP

Abstract

The mineralization of sulfanilic acid has been studied by electro-Fenton (EF) and photoelectro-Fenton (PEF) reaction with UVA light using an undivided electrochemical cell with a boron-doped diamond (BDD) anode and an air diffusion cathode able to generate H(2)O(2). Organics were then oxidized by hydroxyl radicals formed at the anode surface from water oxidation and in the bulk from Fenton's reaction between generated H(2)O(2) and added Fe(2+). The UVA irradiation in PEF enhanced the production of hydroxyl radicals in the bulk, accelerating the removal of organics and photodecomposed intermediates like Fe(III)-carboxylate complexes. Partial decontamination of 1.39 mM sulfanilic acid solutions was achieved by EF until 100 mA cm(-2) at optimum conditions of 0.4 mM Fe(2+) and pH 3.0. The increase in current density and substrate content led to an almost total mineralization. In contrast, the PEF process was more powerful, yielding almost complete mineralization in less electrolysis time under comparable conditions. The kinetics for sulfanilic acid decay always followed a pseudo-first-order reaction. Hydroquinone and p-benzoquinone were detected as aromatic intermediates, whereas acetic, maleic, formic, oxalic, and oxamic acids were identified as generated carboxylic acids. NH(4)(+) ion was preferentially released in both treatments, along with NO(3)(-) ion in smaller proportion.

Authors+Show Affiliations

Laboratori d'Electroquímica dels Materials i del Medi Ambient, Departament de Química Física, Universitat de 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

22404230

Citation

El-Ghenymy, Abdellatif, et al. "Electro-fenton and Photoelectro-fenton Degradation of Sulfanilic Acid Using a Boron-doped Diamond Anode and an Air Diffusion Cathode." The Journal of Physical Chemistry. A, vol. 116, no. 13, 2012, pp. 3404-12.
El-Ghenymy A, Garrido JA, Centellas F, et al. Electro-fenton and photoelectro-fenton degradation of sulfanilic acid using a boron-doped diamond anode and an air diffusion cathode. J Phys Chem A. 2012;116(13):3404-12.
El-Ghenymy, A., Garrido, J. A., Centellas, F., Arias, C., Cabot, P. L., Rodríguez, R. M., & Brillas, E. (2012). Electro-fenton and photoelectro-fenton degradation of sulfanilic acid using a boron-doped diamond anode and an air diffusion cathode. The Journal of Physical Chemistry. A, 116(13), 3404-12. https://doi.org/10.1021/jp300442y
El-Ghenymy A, et al. Electro-fenton and Photoelectro-fenton Degradation of Sulfanilic Acid Using a Boron-doped Diamond Anode and an Air Diffusion Cathode. J Phys Chem A. 2012 Apr 5;116(13):3404-12. PubMed PMID: 22404230.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Electro-fenton and photoelectro-fenton degradation of sulfanilic acid using a boron-doped diamond anode and an air diffusion cathode. AU - El-Ghenymy,Abdellatif, AU - Garrido,José Antonio, AU - Centellas,Francesc, AU - Arias,Conchita, AU - Cabot,Pere Lluís, AU - Rodríguez,Rosa María, AU - Brillas,Enric, Y1 - 2012/03/21/ PY - 2012/3/13/entrez PY - 2012/3/13/pubmed PY - 2012/8/29/medline SP - 3404 EP - 12 JF - The journal of physical chemistry. A JO - J Phys Chem A VL - 116 IS - 13 N2 - The mineralization of sulfanilic acid has been studied by electro-Fenton (EF) and photoelectro-Fenton (PEF) reaction with UVA light using an undivided electrochemical cell with a boron-doped diamond (BDD) anode and an air diffusion cathode able to generate H(2)O(2). Organics were then oxidized by hydroxyl radicals formed at the anode surface from water oxidation and in the bulk from Fenton's reaction between generated H(2)O(2) and added Fe(2+). The UVA irradiation in PEF enhanced the production of hydroxyl radicals in the bulk, accelerating the removal of organics and photodecomposed intermediates like Fe(III)-carboxylate complexes. Partial decontamination of 1.39 mM sulfanilic acid solutions was achieved by EF until 100 mA cm(-2) at optimum conditions of 0.4 mM Fe(2+) and pH 3.0. The increase in current density and substrate content led to an almost total mineralization. In contrast, the PEF process was more powerful, yielding almost complete mineralization in less electrolysis time under comparable conditions. The kinetics for sulfanilic acid decay always followed a pseudo-first-order reaction. Hydroquinone and p-benzoquinone were detected as aromatic intermediates, whereas acetic, maleic, formic, oxalic, and oxamic acids were identified as generated carboxylic acids. NH(4)(+) ion was preferentially released in both treatments, along with NO(3)(-) ion in smaller proportion. SN - 1520-5215 UR - https://www.unboundmedicine.com/medline/citation/22404230/Electro_fenton_and_photoelectro_fenton_degradation_of_sulfanilic_acid_using_a_boron_doped_diamond_anode_and_an_air_diffusion_cathode_ L2 - https://doi.org/10.1021/jp300442y DB - PRIME DP - Unbound Medicine ER -