Voltammetric Study of a Cubic Silsesquioxane Organically Modified with Imidazole and their Subsequent Reaction with Cadmium and Hexacyanoferrate (III)

Autor(es)

Serantoni da Silveira, Tayla Fernanda ^[1] ; Silvestrini, Daniela Rodrigues ^[1] ; Bicalho, Urquisa de Oliveira ^[1] ; do Carmo, Devaney Ribeiro ^[1]

Afiliação do(s) autor(es)

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

• Tipo de documento: Artigo Científico
• Fonte: International Journal of Electrochemical Science; v. 8, n. 1, p. 872-886, JAN 2013.
• Citações Web of Science: 8

Resumo

A hybrid nanocomposite formed by interaction of a octa (3-chloropropyl) octasilsesquioxane modified with imidazol, and its subsequent reaction with cadmium and hexacyanoferrate (II) (CdHSSI) was incorporated into a graphite paste electrode and the electrochemical studies were conducted with cyclic voltammetry. The cyclic voltammogram of the modified graphite paste electrode with CdHSSI (GPE-CdHSSI), showed one redox couple with formal potential E-theta= 0.14V (vs Ag/ AgCl, NaNO3, 1.0 mol L-1; v = 20 mV s(-1)), attributed to the Fe2+(CN)(6)/ Fe3+(CN)(6) process. The redox couple presents an electrocatalytic response for determination of ascorbic acid. The modified electrode gives a linear range from 2.0x10(-4) mol L-1 to 9.0x10(-4) mol L-1 (r=0.998) for the determination of ascorbic acid with detection limit of 1.21x10(-4) mol L-1 with a relative standard deviation of 5% (n=3) and amperometric sensitivity of 6.217 mA/ mol L-1 for ascorbic acid. (AU)

• Processo FAPESP: 03/12882-6 - Dendrímeros de silsesquioxanos e octaamino poli(propileno) imina modificados com triclorotriazina: síntese, caracterização e aplicações
• Beneficiário: Devaney Ribeiro Do Carmo
• Modalidade de apoio: Auxílio à Pesquisa - Jovens Pesquisadores