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Relationship between anode material, supporting electrolyte and current density during electrochemical degradation of organic compounds in water.
J Hazard Mater. 2014 Aug 15; 278:221-6.JH

Abstract

Taking crystal violet (CV) dye as pollutant model, the electrode, electrolyte and current density (i) relationship for electro-degrading organic molecules is discussed. Boron-doped diamond (BDD) or Iridium dioxide (IrO2) used as anode materials were tested with Na2SO4 or NaCl as electrolytes. CV degradation and generated oxidants showed that degradation pathways and efficiency are strongly linked to the current density-electrode-electrolyte interaction. With BDD, the degradation pathway depends on i: If i<the limiting current density (i(lim)), CV is mainly degraded by OH radicals, whereas if i>i(lim), generated oxidants play a major role in the CV elimination. When IrO2 was used, CV removal was not dependent on i, but on the electrolyte. Pollutant degradation in Na2SO4 on IrO2 seems to occur via IrO3; however, in the presence of NaCl, degradation was dependent on the chlorinated oxidative species generated. In terms of efficiency, the Na2SO4 electrolyte showed better results than NaCl when BDD anodes were employed. On the contrary, NaCl was superior when combined with IrO2. Thus, the IrO2/Cl(-) and BDD/SO4(2-) systems were better at removing the pollutant, being the former the most effective. On the other hand, pollutant degradation with the BDD/SO4(2-) and IrO2/Cl(-) systems is favored at low and high current densities, respectively.

Authors+Show Affiliations

Grupo de diagnóstico y control de la contaminación, Facultad de ingeniería, Universidad de Antioquia, A.A. 1226, Medellín, Colombia.Grupo de Investigación en Remediación Ambiental y Biocatálisis, Instituto de Química, Facultad de Ciencias Exactas y Naturales, Universidad de Antioquía Udea, A.A. 1226, Medellín, Colombia.Universidad Autónoma Metropolitana-Iztapalapa, Departamento de Química, Av. San Rafael Atlixco No 186, C.P 09340, México D.F, Mexico.Grupo de diagnóstico y control de la contaminación, Facultad de ingeniería, Universidad de Antioquia, A.A. 1226, Medellín, Colombia.Grupo de Investigación en Remediación Ambiental y Biocatálisis, Instituto de Química, Facultad de Ciencias Exactas y Naturales, Universidad de Antioquía Udea, A.A. 1226, Medellín, Colombia. Electronic address: rtorres@matematicas.udea.edu.co.

Pub Type(s)

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

Language

eng

PubMed ID

24981674

Citation

Guzmán-Duque, Fernando L., et al. "Relationship Between Anode Material, Supporting Electrolyte and Current Density During Electrochemical Degradation of Organic Compounds in Water." Journal of Hazardous Materials, vol. 278, 2014, pp. 221-6.
Guzmán-Duque FL, Palma-Goyes RE, González I, et al. Relationship between anode material, supporting electrolyte and current density during electrochemical degradation of organic compounds in water. J Hazard Mater. 2014;278:221-6.
Guzmán-Duque, F. L., Palma-Goyes, R. E., González, I., Peñuela, G., & Torres-Palma, R. A. (2014). Relationship between anode material, supporting electrolyte and current density during electrochemical degradation of organic compounds in water. Journal of Hazardous Materials, 278, 221-6. https://doi.org/10.1016/j.jhazmat.2014.05.076
Guzmán-Duque FL, et al. Relationship Between Anode Material, Supporting Electrolyte and Current Density During Electrochemical Degradation of Organic Compounds in Water. J Hazard Mater. 2014 Aug 15;278:221-6. PubMed PMID: 24981674.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Relationship between anode material, supporting electrolyte and current density during electrochemical degradation of organic compounds in water. AU - Guzmán-Duque,Fernando L, AU - Palma-Goyes,Ricardo E, AU - González,Ignacio, AU - Peñuela,Gustavo, AU - Torres-Palma,Ricardo A, Y1 - 2014/06/04/ PY - 2014/02/22/received PY - 2014/05/01/revised PY - 2014/05/27/accepted PY - 2014/7/2/entrez PY - 2014/7/2/pubmed PY - 2015/4/4/medline KW - Boron doped diamond KW - Electrochemical oxidation KW - Iridium dioxide KW - Organic pollutants KW - Supporting electrolyte type KW - Water treatment SP - 221 EP - 6 JF - Journal of hazardous materials JO - J Hazard Mater VL - 278 N2 - Taking crystal violet (CV) dye as pollutant model, the electrode, electrolyte and current density (i) relationship for electro-degrading organic molecules is discussed. Boron-doped diamond (BDD) or Iridium dioxide (IrO2) used as anode materials were tested with Na2SO4 or NaCl as electrolytes. CV degradation and generated oxidants showed that degradation pathways and efficiency are strongly linked to the current density-electrode-electrolyte interaction. With BDD, the degradation pathway depends on i: If i<the limiting current density (i(lim)), CV is mainly degraded by OH radicals, whereas if i>i(lim), generated oxidants play a major role in the CV elimination. When IrO2 was used, CV removal was not dependent on i, but on the electrolyte. Pollutant degradation in Na2SO4 on IrO2 seems to occur via IrO3; however, in the presence of NaCl, degradation was dependent on the chlorinated oxidative species generated. In terms of efficiency, the Na2SO4 electrolyte showed better results than NaCl when BDD anodes were employed. On the contrary, NaCl was superior when combined with IrO2. Thus, the IrO2/Cl(-) and BDD/SO4(2-) systems were better at removing the pollutant, being the former the most effective. On the other hand, pollutant degradation with the BDD/SO4(2-) and IrO2/Cl(-) systems is favored at low and high current densities, respectively. SN - 1873-3336 UR - https://www.unboundmedicine.com/medline/citation/24981674/Relationship_between_anode_material_supporting_electrolyte_and_current_density_during_electrochemical_degradation_of_organic_compounds_in_water_ L2 - https://linkinghub.elsevier.com/retrieve/pii/S0304-3894(14)00421-X DB - PRIME DP - Unbound Medicine ER -