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Ti/β-PbO2 versus Ti/Pt/β-PbO2: Influence of the platinum interlayer on the electrodegradation of tetracyclines.

Abstract

The behaviors of the electrodes Ti/PbO2 and Ti/Pt/PbO2 as anodes in the electro-oxidation of two antibiotics-tetracycline and oxytetracycline-were evaluated at different applied current densities, to evaluate the influence of the Pt interlayer. In the preparation of the electrodes, the electrodeposited β-PbO2 phase was homogeneous; no Ti or Pt peaks were detected in the diffractograms. The β-PbO2 surface presented significant roughness when deposited over the Pt interlayer, which also conferred significant conductivity to the material. In the electro-oxidation assays, the COD, TOC and absorbance removals increased with the current density due to an increase in the concentration of hydroxyl radicals, for both electrode materials and antibiotics tested. Slightly better results were obtained with Ti/PbO2. The primary differences observed in the antibiotics concentration decay consisted of zero-order kinetics at the Ti/Pt/PbO2 anode and first-order kinetics at the Ti/PbO2 anode with a higher oxytetracycline concentration decay than the tetracycline concentration decay. A greater amount of total nitrogen was eliminated with the Ti/PbO2 electrode. At the Ti/Pt/PbO2 anode, the organic nitrogen primarily transformed into NH4(+) and the total nitrogen remained unchanged. The specific energy consumption with the Ti/Pt/PbO2 anode was significantly lower than the specific energy consumption with the Ti/PbO2 anode due to the higher electrical conductivity of the Ti/Pt/PbO2 anode. Both anode materials were also utilized in the electro-oxidation of a leachate sample collected at sanitary landfill and spiked with tetracycline, and the complete elimination of the antibiotic molecule was observed.

Authors+Show Affiliations

a FibEnTech UBI Research Unit and Department of Chemistry , University of Beira Interior , Covilhã , Portugal.a FibEnTech UBI Research Unit and Department of Chemistry , University of Beira Interior , Covilhã , Portugal.a FibEnTech UBI Research Unit and Department of Chemistry , University of Beira Interior , Covilhã , Portugal.a FibEnTech UBI Research Unit and Department of Chemistry , University of Beira Interior , Covilhã , Portugal.a FibEnTech UBI Research Unit and Department of Chemistry , University of Beira Interior , Covilhã , Portugal.

Pub Type(s)

Journal Article

Language

eng

PubMed ID

27230959

Citation

Nunes, Maria João, et al. "Ti/β-PbO2 Versus Ti/Pt/β-PbO2: Influence of the Platinum Interlayer On the Electrodegradation of Tetracyclines." Journal of Environmental Science and Health. Part A, Toxic/hazardous Substances & Environmental Engineering, vol. 51, no. 10, 2016, pp. 839-46.
Nunes MJ, Monteiro N, Pacheco MJ, et al. Ti/β-PbO2 versus Ti/Pt/β-PbO2: Influence of the platinum interlayer on the electrodegradation of tetracyclines. J Environ Sci Health A Tox Hazard Subst Environ Eng. 2016;51(10):839-46.
Nunes, M. J., Monteiro, N., Pacheco, M. J., Lopes, A., & Ciríaco, L. (2016). Ti/β-PbO2 versus Ti/Pt/β-PbO2: Influence of the platinum interlayer on the electrodegradation of tetracyclines. Journal of Environmental Science and Health. Part A, Toxic/hazardous Substances & Environmental Engineering, 51(10), 839-46. https://doi.org/10.1080/10934529.2016.1181455
Nunes MJ, et al. Ti/β-PbO2 Versus Ti/Pt/β-PbO2: Influence of the Platinum Interlayer On the Electrodegradation of Tetracyclines. J Environ Sci Health A Tox Hazard Subst Environ Eng. 2016 Aug 23;51(10):839-46. PubMed PMID: 27230959.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Ti/β-PbO2 versus Ti/Pt/β-PbO2: Influence of the platinum interlayer on the electrodegradation of tetracyclines. AU - Nunes,Maria João, AU - Monteiro,Nuno, AU - Pacheco,Maria José, AU - Lopes,Ana, AU - Ciríaco,Lurdes, Y1 - 2016/05/26/ PY - 2016/5/28/entrez PY - 2016/5/28/pubmed PY - 2017/4/25/medline KW - Electro-oxidation KW - Ti/PbO2; Ti/Pt/PbO2 KW - oxytetracycline KW - tetracycline SP - 839 EP - 46 JF - Journal of environmental science and health. Part A, Toxic/hazardous substances & environmental engineering JO - J Environ Sci Health A Tox Hazard Subst Environ Eng VL - 51 IS - 10 N2 - The behaviors of the electrodes Ti/PbO2 and Ti/Pt/PbO2 as anodes in the electro-oxidation of two antibiotics-tetracycline and oxytetracycline-were evaluated at different applied current densities, to evaluate the influence of the Pt interlayer. In the preparation of the electrodes, the electrodeposited β-PbO2 phase was homogeneous; no Ti or Pt peaks were detected in the diffractograms. The β-PbO2 surface presented significant roughness when deposited over the Pt interlayer, which also conferred significant conductivity to the material. In the electro-oxidation assays, the COD, TOC and absorbance removals increased with the current density due to an increase in the concentration of hydroxyl radicals, for both electrode materials and antibiotics tested. Slightly better results were obtained with Ti/PbO2. The primary differences observed in the antibiotics concentration decay consisted of zero-order kinetics at the Ti/Pt/PbO2 anode and first-order kinetics at the Ti/PbO2 anode with a higher oxytetracycline concentration decay than the tetracycline concentration decay. A greater amount of total nitrogen was eliminated with the Ti/PbO2 electrode. At the Ti/Pt/PbO2 anode, the organic nitrogen primarily transformed into NH4(+) and the total nitrogen remained unchanged. The specific energy consumption with the Ti/Pt/PbO2 anode was significantly lower than the specific energy consumption with the Ti/PbO2 anode due to the higher electrical conductivity of the Ti/Pt/PbO2 anode. Both anode materials were also utilized in the electro-oxidation of a leachate sample collected at sanitary landfill and spiked with tetracycline, and the complete elimination of the antibiotic molecule was observed. SN - 1532-4117 UR - https://www.unboundmedicine.com/medline/citation/27230959/Ti/β_PbO2_versus_Ti/Pt/β_PbO2:_Influence_of_the_platinum_interlayer_on_the_electrodegradation_of_tetracyclines_ L2 - https://www.tandfonline.com/doi/full/10.1080/10934529.2016.1181455 DB - PRIME DP - Unbound Medicine ER -