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

Author(s)

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]

Affiliation

^[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

• Document type: Journal article
• Source: International Journal of Electrochemical Science; v. 8, n. 6, p. 7565-7580, JUN 2013.
• Web of Science Citations: 8

Abstract

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)

• FAPESP's process: 12/11306-0 - Electrochemical quantification of analytes of environmental and biological interest, using new materials prepared from functionalized silsesquioxanes.
• Grantee: Daniela Silvestrini Fernandes
• Support type: Scholarships in Brazil - Doctorate
• FAPESP's process: 12/05438-1 - Development of novel nanostructured organically functionalized hybrid silsesquioxanes: preparation, characterization and its application as a sensor of compounds and ions of environmental and biological interest
• Grantee: Devaney Ribeiro Do Carmo
• Support type: Regular Research Grants