A New Hybrid Polyhedral Cubic Silsesquioxane Chemically Modified with 4-amino-5-(4-pyridyl)-4H-1,2,4-triazole-3-thiol (APTT) and Copper Hexacyanoferrate(III) for Voltammetric Determination of Nitrite

Autor(es)

Soares, Layciane Aparecida ^[1] ; Serantoni da Silveira, Tayla Fernanda ^[1] ; Silvestrini, Daniela Rodrigues ^[1] ; Bicalho, Urquisa de Oliveira ^[1] ; Dias Filho, Newton Luiz ^[1] ; do Carmo, Devaney Ribeiro ^[1]

Afiliação do(s) autor(es)

^[1] UNSEP Univ Estadual Paulista, Fac Engn Ilha Solteira, Dept Fis & Quim, BR-15385000 Ilha Solteira, SP - Brazil

• Tipo de documento: Artigo Científico
• Fonte: International Journal of Electrochemical Science; v. 8, n. 4, p. 4654-4669, APR 2013.
• Citações Web of Science: 13

Resumo

This paper describes the preparation, and voltammetric application of a hybrid nanocomposite formed by interaction of a octa(3-chloropropyl)octasilsesquioxane (SS) modified with 4-amino-5-4 (pyridyl)-4H-1,2,4-triazole-3-thiol (SA), and its subsequent reactions in two steps, first with copper and so hexacyanoferrate (III) (CuHSA). The precursors and CuHSA were initially characterized by by Fourier transform infrared spectra (FTIR). This composite was incorporated into a graphite paste electrode and the electrochemical behavior studies were conducted with cyclic voltammetry. The cyclic voltammogram of the modified graphite paste electrode with CuHSA, showed one redox couple with formal potential E-theta' = 0.75V vs Ag/AgCl(sat) (KCl 1.0 mol L-1; v = 20 mV s(-1)) attributed to the redox process Fe-(II)(CN)(6) / Fe-(III)(CN)(6) of the binuclear complex formed. The redox couple presents an electrocatalytic response for determination of nitrite. The modified graphite paste electrode showed a linear response of 1.0 x 10(-5) to 5.0 x 10(-3) mol L-1. The method has a detection limit of 3.57 x 10(-4) mol L-1, standard deviation of 1.5% for n=3 with an amperometric sensitivity 30.00 mA/mol L-1 to nitrite. The modified electrode was electrochemically stable and showed good reproducibility. (AU)

• Processo FAPESP: 12/05438-1 - Desenvolvimento de novos silsesquioxanos nanoestruturados híbridos organofuncionalizados: preparação, caracterização e suas aplicações como sensores de compostos e íons de interesse ambiental e biológico
• Beneficiário: Devaney Ribeiro Do Carmo
• Modalidade de apoio: Auxílio à Pesquisa - Regular
• Processo FAPESP: 12/11306-0 - Quantificação eletroquímica de analitos de interesse ambiental e biológico, empregando novos materiais preparados a partir de silsesquioxanos funcionalizados.
• Beneficiário: Daniela Silvestrini Fernandes
• Modalidade de apoio: Bolsas no Brasil - Doutorado