Immobilization of ruthenium phthalocyanine on silica-coated multi-wall partially oriented carbon nanotubes: Electrochemical detection of fenitrothion pesticide

Autor(es)

Canevari, Thiago C. ^[1] ; Prado, Thiago M. ^[2] ; Cincotto, Fernando H. ^[2] ; Machado, Sergio A. S. ^[2]

Afiliação do(s) autor(es)

^[1] Univ Prebiteriana Mackenzie, Sch Engn, BR-01302907 Sao Paulo, SP - Brazil

^[2] State Univ Sao Paulo, Inst Chem, POB 780, BR-13560970 Sao Carlos, SP - Brazil

• Tipo de documento: Artigo Científico
• Fonte: Materials Research Bulletin; v. 76, p. 41-47, APR 2016.
• Citações Web of Science: 18

Resumo

This paper reports on the determination of the pesticide fenitrothion using a glassy carbon electrode modified with silica-coated, multi-walled, partially oriented carbon nanotubes, SiO2/MWCNTs, containing ruthenium phthalocyanine (RuPc) synthesized in situ. The hybrid SiO2/MWCNTs/RuPc material was characterized by UV-vis absorption spectroscopy, X-ray photoelectron spectroscopy (XPS), scanning electron microscopy (SEM), high-resolution transmission electron microscopy (HR-TEM) and differential pulse voltammetry. The modified electrode showed well-defined peaks in the presence of fenitrothion in acetate buffer, pH 4.5, with a sensitivity of 0.0822 mu A mu M-1 mm(-2) and a detection limit of 0.45 ppm. Notably, the modified SiO2/MWCNTs/RuPc electrodes with did not suffer from significant influences in the presence of other organophosphorus pesticides during the determination of the fenitrothion pesticide. Moreover, this modified electrode showed excellent performance in the determination of fenitrothion in orange juice. (C) 2015 Elsevier Ltd. All rights reserved. (AU)

• Processo FAPESP: 12/18339-1 - Detecção dos interferentes endócrinos testosterona e estradiol em amostras ambientais empregando eletrodos modificados com grafeno, nanopartículas de ouro e quantum dots.
• Beneficiário: Fernando Henrique Cincotto
• Modalidade de apoio: Bolsas no Brasil - Doutorado
• Processo FAPESP: 11/23047-7 - Desenvolvimento de biosensor eletroquímico utilizando sílica mesoporosa contendo nanotubos de carbono obtida pelo processo sol-gel. Determinação eletroquímica de pesticidas
• Beneficiário: Thiago da Cruz Canevari
• Modalidade de apoio: Bolsas no Brasil - Pós-Doutorado