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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

Diamond electrodes applied to the voltammetric generation of nitro-anion radicals from methyl parathion in aqueous media

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Author(s):
Lima, T. S. [1] ; Almeida, M. O. [2] ; La-Scalea, M. A. [1] ; Honorio, K. M. [2, 3] ; Santos, M. C. [4] ; Codognoto, L. [1]
Total Authors: 6
Affiliation:
[1] Univ Fed Sao Paulo UNIFESP, Inst Ciencias Ambientais Quim & Farmaceut, Dept Quim, Diadema, SP - Brazil
[2] Univ Fed ABC UFABC, Ctr Ciencias Nat & Humanas CCNH, Santo Andre, SP - Brazil
[3] Univ Sao Paulo, Escola Artes Ciencias & Humanidades, Sao Paulo, SP - Brazil
[4] Univ Fed ABC UFABC, Lab Eletroquim & Mat Nanoestruturados LEMN, Ctr Ciencias Nat & Humans CCNH, Rua Santa Adelia 166, BR-09210170 Santo Andre, SP - Brazil
Total Affiliations: 4
Document type: Journal article
Source: DIAMOND AND RELATED MATERIALS; v. 110, DEC 2020.
Web of Science Citations: 0
Abstract

Electrochemical performance of methyl parathion (MP) at a boron-doped diamond (BDD) electrode was investigated in aqueous media by cyclic voltammetry (CV) and square wave voltammetry (SWV). Methyl parathion (MP) shows electroactivity on BDD electrodes, three peaks being registered corresponding to one oxidation (0.16 V) and two reduction peaks, at -0.53 V and 0.01 V. MP reduction is certainly pH-dependent. However, at pH > 9.0 the electrochemical reduction of MP involves a reversible reaction of one electron forming the nitro-anion radical (NAR). The nitro-anion radical undergoes disproportionation and its kinetic stability was evaluated by using a peak current ratio corresponding to the reversible pair R - NO2/R NO2 center dot-, and the second-order constant (k(2)) was determined. Moreover, thermodynamic parameters regarding the MP reduction mechanism and nitro anion radical generation were investigated by computational methods. (AU)

FAPESP's process: 17/10118-0 - Study and application of electrochemical technology for the analysis and degradation of endocrine interferents: materials, sensors, processes and scientific dissemination
Grantee:Marcos Roberto de Vasconcelos Lanza
Support Opportunities: Research Projects - Thematic Grants
FAPESP's process: 17/21846-6 - Nanostructures for environmental remediation and power generation from renewable sources
Grantee:Mauro Coelho dos Santos
Support Opportunities: Program for Research on Bioenergy (BIOEN) - Regular Program Grants