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Degradation of Acid Orange 7 by electrochemically generated (*)OH radicals in acidic aqueous medium using a boron-doped diamond or platinum anode: a mechanistic study.
Chemosphere. 2008 Oct; 73(5):678-84.C

Abstract

A comparative study of the degradation of Acid Orange 7 (AO 7) aqueous solutions in acidic medium of pH 3.0 by electro-Fenton process using Pt or boron-doped diamond (BDD) anode was reported. The oxidative degradation of AO 7 by electrochemically generated hydroxyl radicals follows a pseudo-first order kinetic with a similar rate constant with BDD or Pt anode. The absolute rate constant of the AO 7 hydroxylation reaction was determined as (1.10+/-0.04)x10(10)M(-1)s(-1) by using the competition kinetic method. The comparative study of TOC measurements during electro-Fenton treatment showed a higher mineralization rate with BDD than Pt anode at the first hours of electrolysis because of the higher oxidizing power of this anode. The electro-Fenton degradation of AO 7 was followed by monitoring the formation and evolution of aromatic intermediates which are oxidized to aliphatic carboxylic acids before mineralization (transformation to CO(2) and inorganic ions, i.e. sulphate, nitrate and ammonium). The follow-up of the solution toxicity evolution shows the formation of intermediates more toxic than AO 7 and the connection between toxicity and aromaticity. A mineralization reaction pathway of AO 7 by electro-Fenton degradation involving all the intermediates identified was proposed.

Authors+Show Affiliations

Université Paris-Est, Laboratoire des Géomatériaux et Géologie de l'Ingénieur, Bat IFI, 5 Boulevard Descartes, 77454 Marne la Vallée Cedex 2, France.No 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

18760822

Citation

Hammami, Samiha, et al. "Degradation of Acid Orange 7 By Electrochemically Generated (*)OH Radicals in Acidic Aqueous Medium Using a Boron-doped Diamond or Platinum Anode: a Mechanistic Study." Chemosphere, vol. 73, no. 5, 2008, pp. 678-84.
Hammami S, Bellakhal N, Oturan N, et al. Degradation of Acid Orange 7 by electrochemically generated (*)OH radicals in acidic aqueous medium using a boron-doped diamond or platinum anode: a mechanistic study. Chemosphere. 2008;73(5):678-84.
Hammami, S., Bellakhal, N., Oturan, N., Oturan, M. A., & Dachraoui, M. (2008). Degradation of Acid Orange 7 by electrochemically generated (*)OH radicals in acidic aqueous medium using a boron-doped diamond or platinum anode: a mechanistic study. Chemosphere, 73(5), 678-84. https://doi.org/10.1016/j.chemosphere.2008.07.010
Hammami S, et al. Degradation of Acid Orange 7 By Electrochemically Generated (*)OH Radicals in Acidic Aqueous Medium Using a Boron-doped Diamond or Platinum Anode: a Mechanistic Study. Chemosphere. 2008;73(5):678-84. PubMed PMID: 18760822.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Degradation of Acid Orange 7 by electrochemically generated (*)OH radicals in acidic aqueous medium using a boron-doped diamond or platinum anode: a mechanistic study. AU - Hammami,Samiha, AU - Bellakhal,Nizar, AU - Oturan,Nihal, AU - Oturan,Mehmet A, AU - Dachraoui,Mohamed, Y1 - 2008/08/29/ PY - 2008/04/23/received PY - 2008/07/03/revised PY - 2008/07/07/accepted PY - 2008/9/2/pubmed PY - 2008/12/23/medline PY - 2008/9/2/entrez SP - 678 EP - 84 JF - Chemosphere JO - Chemosphere VL - 73 IS - 5 N2 - A comparative study of the degradation of Acid Orange 7 (AO 7) aqueous solutions in acidic medium of pH 3.0 by electro-Fenton process using Pt or boron-doped diamond (BDD) anode was reported. The oxidative degradation of AO 7 by electrochemically generated hydroxyl radicals follows a pseudo-first order kinetic with a similar rate constant with BDD or Pt anode. The absolute rate constant of the AO 7 hydroxylation reaction was determined as (1.10+/-0.04)x10(10)M(-1)s(-1) by using the competition kinetic method. The comparative study of TOC measurements during electro-Fenton treatment showed a higher mineralization rate with BDD than Pt anode at the first hours of electrolysis because of the higher oxidizing power of this anode. The electro-Fenton degradation of AO 7 was followed by monitoring the formation and evolution of aromatic intermediates which are oxidized to aliphatic carboxylic acids before mineralization (transformation to CO(2) and inorganic ions, i.e. sulphate, nitrate and ammonium). The follow-up of the solution toxicity evolution shows the formation of intermediates more toxic than AO 7 and the connection between toxicity and aromaticity. A mineralization reaction pathway of AO 7 by electro-Fenton degradation involving all the intermediates identified was proposed. SN - 0045-6535 UR - https://www.unboundmedicine.com/medline/citation/18760822/Degradation_of_Acid_Orange_7_by_electrochemically_generated____OH_radicals_in_acidic_aqueous_medium_using_a_boron_doped_diamond_or_platinum_anode:_a_mechanistic_study_ L2 - https://linkinghub.elsevier.com/retrieve/pii/S0045-6535(08)00871-0 DB - PRIME DP - Unbound Medicine ER -