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A comparative study of the electrochemical oxidation of the herbicide tebuthiuron using boron-doped diamond electrodes.
Chemosphere. 2012 Jun; 88(2):155-60.C

Abstract

The thiadiazolylurea derivative tebuthiuron (TBH) is commonly used as an herbicide even though it is highly toxic to humans. While various processes have been proposed for the removal of organic contaminants of this type from wastewater, electrochemical degradation has shown particular promise. The aim of the present study was to investigate the electrochemical degradation of TBH using anodes comprising boron-doped (5000 and 30,000 ppm) diamond (BDD) films deposited onto Ti substrates operated at current densities in the range 10-200 mA cm(-2). Both anodes removed TBH following a similar pseudo first-order reaction kinetics with k(app) close to 3.2 × 10(-2) min(-1). The maximum mineralization efficiency obtained was 80%. High-pressure liquid chromatography with UV-VIS detection established that both anodes degraded TBH via similar intermediates. Ion chromatography revealed that increasing concentrations of nitrate ions (up to 0.9 ppm) were formed with increasing current density, while the formation of nitrite ions was observed with both anodes at current densities ≥ 150 mA cm(-2). The BDD film prepared at the lower doping level (5000 ppm) was more efficient in degrading TBH than its more highly doped counterpart. This unexpected finding may be explained in terms of the quantity of impurities incorporated into the diamond lattice during chemical vapor deposition.

Authors+Show Affiliations

Instituto de Química de São Carlos, Universidade de São Paulo, Brazil.No affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info available

Pub Type(s)

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

Language

eng

PubMed ID

22406242

Citation

Alves, S A., et al. "A Comparative Study of the Electrochemical Oxidation of the Herbicide Tebuthiuron Using Boron-doped Diamond Electrodes." Chemosphere, vol. 88, no. 2, 2012, pp. 155-60.
Alves SA, Ferreira TC, Sabatini NS, et al. A comparative study of the electrochemical oxidation of the herbicide tebuthiuron using boron-doped diamond electrodes. Chemosphere. 2012;88(2):155-60.
Alves, S. A., Ferreira, T. C., Sabatini, N. S., Trientini, A. C., Migliorini, F. L., Baldan, M. R., Ferreira, N. G., & Lanza, M. R. (2012). A comparative study of the electrochemical oxidation of the herbicide tebuthiuron using boron-doped diamond electrodes. Chemosphere, 88(2), 155-60. https://doi.org/10.1016/j.chemosphere.2012.02.042
Alves SA, et al. A Comparative Study of the Electrochemical Oxidation of the Herbicide Tebuthiuron Using Boron-doped Diamond Electrodes. Chemosphere. 2012;88(2):155-60. PubMed PMID: 22406242.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - A comparative study of the electrochemical oxidation of the herbicide tebuthiuron using boron-doped diamond electrodes. AU - Alves,S A, AU - Ferreira,T C R, AU - Sabatini,N S, AU - Trientini,A C A, AU - Migliorini,F L, AU - Baldan,M R, AU - Ferreira,N G, AU - Lanza,M R V, Y1 - 2012/03/09/ PY - 2011/06/30/received PY - 2012/02/09/revised PY - 2012/02/10/accepted PY - 2012/3/13/entrez PY - 2012/3/13/pubmed PY - 2012/8/3/medline SP - 155 EP - 60 JF - Chemosphere JO - Chemosphere VL - 88 IS - 2 N2 - The thiadiazolylurea derivative tebuthiuron (TBH) is commonly used as an herbicide even though it is highly toxic to humans. While various processes have been proposed for the removal of organic contaminants of this type from wastewater, electrochemical degradation has shown particular promise. The aim of the present study was to investigate the electrochemical degradation of TBH using anodes comprising boron-doped (5000 and 30,000 ppm) diamond (BDD) films deposited onto Ti substrates operated at current densities in the range 10-200 mA cm(-2). Both anodes removed TBH following a similar pseudo first-order reaction kinetics with k(app) close to 3.2 × 10(-2) min(-1). The maximum mineralization efficiency obtained was 80%. High-pressure liquid chromatography with UV-VIS detection established that both anodes degraded TBH via similar intermediates. Ion chromatography revealed that increasing concentrations of nitrate ions (up to 0.9 ppm) were formed with increasing current density, while the formation of nitrite ions was observed with both anodes at current densities ≥ 150 mA cm(-2). The BDD film prepared at the lower doping level (5000 ppm) was more efficient in degrading TBH than its more highly doped counterpart. This unexpected finding may be explained in terms of the quantity of impurities incorporated into the diamond lattice during chemical vapor deposition. SN - 1879-1298 UR - https://www.unboundmedicine.com/medline/citation/22406242/A_comparative_study_of_the_electrochemical_oxidation_of_the_herbicide_tebuthiuron_using_boron_doped_diamond_electrodes_ L2 - https://linkinghub.elsevier.com/retrieve/pii/S0045-6535(12)00232-9 DB - PRIME DP - Unbound Medicine ER -