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Degradation of oxamic acid using dimensionally stable anodes (DSA) based on a mixture of RuO2 and IrO2 nanoparticles.
Chemosphere. 2020 Jul; 251:126674.C

Abstract

Dimensionally stable anodes (DSA) have been widely used to degrade organic compounds because these surfaces promote the electrogeneration of active chlorine species in the bulk of the solution, as well as in the vicinity of the anode when NaCl is used as supporting electrolyte. In this work, the nanoparticles synthesis of IrO2 and RuO2 was performed to obtain two types of DSA electrodes named Class I and II to degrade oxamic acid. For Class I and II DSA, the nanoparticles used were synthesized separately and in the same reaction medium, respectively. Electrolysis were carried out in an open cylindrical cell without division at 25 °C, DSAs were used as anodes and a stainless-steel electrode as cathode, both elements have a geometric area of 2.8 cm2 immersed in 0.05 mol L-1 of NaCl or Na2SO4 and a current density of 3 mA cm-2 was applied for 6 h. Active chlorine species generated in the absence of oxamic acid in NaCl were also detected and quantified through ion chromatography. In Na2SO4 there was no degradation of the compound, but in NaCl the oxamic acid concentration reaching 85% with Class I DSA. The same tendency is observed in mineralization, in which Class I DSA allowed reaching a CO2 transformation close to 73%. The difference in the results occurs because with Class I DSA, more hypochlorite is generated than with Class II and therefore there is a larger amount of oxidizing species in the solution that enables the degradation and mineralization of oxamic acid.

Authors+Show Affiliations

Laboratorio de Electroquímica Del Medio Ambiente, LEQMA. Departamento de Química de los Materiales, Facultad de Química y Biología.Universidad de Santiago de Chile, USACH, Santiago, Chile. Electronic address: lidia.espinoza@usach.cl.Facultad de Química and Biología, CEDENNA, Universidad de Santiago de Chile, USACH, Santiago, Chile.Laboratorio de síntesis y Modificación de Nanoestructuras y Materiales Bidimensionales. Centro de Investigación en Materiales Avanzados S.C. (CIMAV), Mexico.Laboratorio de Materiais Magneticos e Coloides, Departamento de Fisicoquímica, São Paulo State University,UNESP, Araraquara, Brazil.Laboratorio de Electroquímica Del Medio Ambiente, LEQMA. Departamento de Química de los Materiales, Facultad de Química y Biología.Universidad de Santiago de Chile, USACH, Santiago, Chile. Electronic address: ricardo.salazar@usach.cl.

Pub Type(s)

Journal Article

Language

eng

PubMed ID

32359720

Citation

Espinoza, L Carolina, et al. "Degradation of Oxamic Acid Using Dimensionally Stable Anodes (DSA) Based On a Mixture of RuO2 and IrO2 Nanoparticles." Chemosphere, vol. 251, 2020, p. 126674.
Espinoza LC, Sepúlveda P, García A, et al. Degradation of oxamic acid using dimensionally stable anodes (DSA) based on a mixture of RuO2 and IrO2 nanoparticles. Chemosphere. 2020;251:126674.
Espinoza, L. C., Sepúlveda, P., García, A., Martins de Godoi, D., & Salazar, R. (2020). Degradation of oxamic acid using dimensionally stable anodes (DSA) based on a mixture of RuO2 and IrO2 nanoparticles. Chemosphere, 251, 126674. https://doi.org/10.1016/j.chemosphere.2020.126674
Espinoza LC, et al. Degradation of Oxamic Acid Using Dimensionally Stable Anodes (DSA) Based On a Mixture of RuO2 and IrO2 Nanoparticles. Chemosphere. 2020;251:126674. PubMed PMID: 32359720.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Degradation of oxamic acid using dimensionally stable anodes (DSA) based on a mixture of RuO2 and IrO2 nanoparticles. AU - Espinoza,L Carolina, AU - Sepúlveda,Pamela, AU - García,Alejandra, AU - Martins de Godoi,Denis, AU - Salazar,Ricardo, Y1 - 2020/04/05/ PY - 2020/01/16/received PY - 2020/03/30/revised PY - 2020/03/31/accepted PY - 2020/5/4/pubmed PY - 2020/6/20/medline PY - 2020/5/4/entrez KW - Anodic-oxidation KW - Degradation KW - Dimensionally stable anode KW - Oxamic acid SP - 126674 EP - 126674 JF - Chemosphere JO - Chemosphere VL - 251 N2 - Dimensionally stable anodes (DSA) have been widely used to degrade organic compounds because these surfaces promote the electrogeneration of active chlorine species in the bulk of the solution, as well as in the vicinity of the anode when NaCl is used as supporting electrolyte. In this work, the nanoparticles synthesis of IrO2 and RuO2 was performed to obtain two types of DSA electrodes named Class I and II to degrade oxamic acid. For Class I and II DSA, the nanoparticles used were synthesized separately and in the same reaction medium, respectively. Electrolysis were carried out in an open cylindrical cell without division at 25 °C, DSAs were used as anodes and a stainless-steel electrode as cathode, both elements have a geometric area of 2.8 cm2 immersed in 0.05 mol L-1 of NaCl or Na2SO4 and a current density of 3 mA cm-2 was applied for 6 h. Active chlorine species generated in the absence of oxamic acid in NaCl were also detected and quantified through ion chromatography. In Na2SO4 there was no degradation of the compound, but in NaCl the oxamic acid concentration reaching 85% with Class I DSA. The same tendency is observed in mineralization, in which Class I DSA allowed reaching a CO2 transformation close to 73%. The difference in the results occurs because with Class I DSA, more hypochlorite is generated than with Class II and therefore there is a larger amount of oxidizing species in the solution that enables the degradation and mineralization of oxamic acid. SN - 1879-1298 UR - https://www.unboundmedicine.com/medline/citation/32359720/Degradation_of_oxamic_acid_using_dimensionally_stable_anodes__DSA__based_on_a_mixture_of_RuO2_and_IrO2_nanoparticles_ L2 - https://linkinghub.elsevier.com/retrieve/pii/S0045-6535(20)30867-5 DB - PRIME DP - Unbound Medicine ER -