A Cubic Silsesquioxane Modified With Purpald (R) : Preparation, Characterization and a Voltammetric Application for Determination of Sulfite

Autor(es)

Soares, Layciane Aparecida ^[1] ; Yingzi, Wang ^[2] ; 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] Univ Estadual Paulista, Fac Engn Ilha Solteira UNESP, Dept Quim & Fis, BR-15385000 Ilha Solteira, SP - Brazil

^[2] Wang Yingzi, Shanghai Univ, Dept Chem, Coll Sci, Shanghai 200444 - Peoples R China

• Tipo de documento: Artigo Científico
• Fonte: International Journal of Electrochemical Science; v. 8, n. 6, p. 7565-7580, JUN 2013.
• Citações Web of Science: 8

Resumo

A novel composite formed by interaction of a octa(3-chloropropyl)octasilsesquioxane modified with Purpald(R), and its subsequent reaction with silver and hexacyanoferrate (III) (AgHSP), was synthesized and initially characterized by Fourier transform infrared spectra (FTIR) and cyclic voltammetry. The cyclic voltammogram of the modified graphite paste electrode with AgHSP, showed one redox couple with formal potential E-theta'=0.64V (vs Ag/AgCl, KNO3, 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 sulfite. The modified electrode showed a linear response from 7.0x10(-5) to 1.0x10(-3) mol L-1 with the corresponding equation Y(mu A) = 18.05 + 29.983x10(3) {[}sulfite], and a correlation coefficient of r=0.999. The method showed a detection limit of 0.115x10(-4) mol L-1 with a relative standard deviation of +/- 4% (n = 3) and amperometric sensitivity of 29.983x10(-3)A mol L-1. The modified electrode showed a excellent stability and good reproducibility during experiments. (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