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Mineralization of desmetryne by electrochemical advanced oxidation processes using a boron-doped diamond anode and an oxygen-diffusion cathode.
Chemosphere. 2011 Nov; 85(7):1167-75.C

Abstract

The mineralization of acidic aqueous solutions of the herbicide desmetryne has been studied by electrochemical advanced oxidation processes (EAOPs) such as anodic oxidation with electrogenerated H(2)O(2) (AO-H(2)O(2)), electro-Fenton (EF) and photoelectro-Fenton (PEF) with UVA light. Electrolyses were conducted in an open and cylindrical cell with a boron-doped diamond (BDD) anode and an O(2)-diffusion cathode for H(2)O(2) generation. The main oxidizing species are ()OH radicals formed at the BDD surface in all treatments and in the bulk from Fenton's reaction between added Fe(2+) and electrogenerated H(2)O(2) in EF and PEF. A poor mineralization was attained using AO-H(2)O(2) by the slow oxidation of persistent by-products with ()OH at the BDD surface. The synergistic action of ()OH in the bulk enhanced the degradation rate in EF, although almost total mineralization was only achieved in PEF due to the additional ()OH generation and photolysis of intermediates by UVA irradiation. The effect of current, pH and herbicide concentration on the mineralization degree and mineralization current efficiency of each EAOP was examined. Desmetryne decay always followed a pseudo first-order kinetics, being more rapidly destroyed in the sequence AO-H(2)O(2)<EF<PEF. In all EAOPs, ammeline and cyanuric acid were identified as persistent heteroaromatic by-products and oxamic and formic acids were detected as generated carboxylic acids. The generation of cyanuric acid mainly by oxidation with ()OH at the BDD surface is the predominant path for desmetryne degradation. The initial nitrogen of desmetryne yielded NO(3)(-) ion in low proportion and NH(4)(+) ion in much lesser extent, suggesting that its major part was lost as volatile N-derivatives.

Authors+Show Affiliations

Unitat de Química Industrial, Escola Universitàtia d'Enginyeria Tècnica Industrial de Barcelona, Universitat Politècnica de Catalunya, Comte d'Urgell 187, Barcelona, Spain.No 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

21996652

Citation

Borràs, Núria, et al. "Mineralization of Desmetryne By Electrochemical Advanced Oxidation Processes Using a Boron-doped Diamond Anode and an Oxygen-diffusion Cathode." Chemosphere, vol. 85, no. 7, 2011, pp. 1167-75.
Borràs N, Arias C, Oliver R, et al. Mineralization of desmetryne by electrochemical advanced oxidation processes using a boron-doped diamond anode and an oxygen-diffusion cathode. Chemosphere. 2011;85(7):1167-75.
Borràs, N., Arias, C., Oliver, R., & Brillas, E. (2011). Mineralization of desmetryne by electrochemical advanced oxidation processes using a boron-doped diamond anode and an oxygen-diffusion cathode. Chemosphere, 85(7), 1167-75. https://doi.org/10.1016/j.chemosphere.2011.09.008
Borràs N, et al. Mineralization of Desmetryne By Electrochemical Advanced Oxidation Processes Using a Boron-doped Diamond Anode and an Oxygen-diffusion Cathode. Chemosphere. 2011;85(7):1167-75. PubMed PMID: 21996652.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Mineralization of desmetryne by electrochemical advanced oxidation processes using a boron-doped diamond anode and an oxygen-diffusion cathode. AU - Borràs,Núria, AU - Arias,Conchita, AU - Oliver,Ramon, AU - Brillas,Enric, Y1 - 2011/10/11/ PY - 2011/08/09/received PY - 2011/09/16/revised PY - 2011/09/16/accepted PY - 2011/10/15/entrez PY - 2011/10/15/pubmed PY - 2012/3/1/medline SP - 1167 EP - 75 JF - Chemosphere JO - Chemosphere VL - 85 IS - 7 N2 - The mineralization of acidic aqueous solutions of the herbicide desmetryne has been studied by electrochemical advanced oxidation processes (EAOPs) such as anodic oxidation with electrogenerated H(2)O(2) (AO-H(2)O(2)), electro-Fenton (EF) and photoelectro-Fenton (PEF) with UVA light. Electrolyses were conducted in an open and cylindrical cell with a boron-doped diamond (BDD) anode and an O(2)-diffusion cathode for H(2)O(2) generation. The main oxidizing species are ()OH radicals formed at the BDD surface in all treatments and in the bulk from Fenton's reaction between added Fe(2+) and electrogenerated H(2)O(2) in EF and PEF. A poor mineralization was attained using AO-H(2)O(2) by the slow oxidation of persistent by-products with ()OH at the BDD surface. The synergistic action of ()OH in the bulk enhanced the degradation rate in EF, although almost total mineralization was only achieved in PEF due to the additional ()OH generation and photolysis of intermediates by UVA irradiation. The effect of current, pH and herbicide concentration on the mineralization degree and mineralization current efficiency of each EAOP was examined. Desmetryne decay always followed a pseudo first-order kinetics, being more rapidly destroyed in the sequence AO-H(2)O(2)<EF<PEF. In all EAOPs, ammeline and cyanuric acid were identified as persistent heteroaromatic by-products and oxamic and formic acids were detected as generated carboxylic acids. The generation of cyanuric acid mainly by oxidation with ()OH at the BDD surface is the predominant path for desmetryne degradation. The initial nitrogen of desmetryne yielded NO(3)(-) ion in low proportion and NH(4)(+) ion in much lesser extent, suggesting that its major part was lost as volatile N-derivatives. SN - 1879-1298 UR - https://www.unboundmedicine.com/medline/citation/21996652/Mineralization_of_desmetryne_by_electrochemical_advanced_oxidation_processes_using_a_boron_doped_diamond_anode_and_an_oxygen_diffusion_cathode_ L2 - https://linkinghub.elsevier.com/retrieve/pii/S0045-6535(11)01040-X DB - PRIME DP - Unbound Medicine ER -