Voltammetric Properties of Nickel Hexacyanoferrate (III) Obtained on the Titanium (IV) Silsesquioxane Occluded into the H-FAU Zeolite for Detection of Sulfite

Author(s)

do Carmo, Devaney Ribeiro ^[1] ; Maraldi, Vitor Alexandre ^[1] ; Cumba, Loanda Raquel ^[1]

Affiliation

^[1] UNESP Univ Estadual Paulista, Dept Fis & Quim, Fac Engn Ilha Solteira, Av Brasil Ctr 56, BR-15385000 Ilha Solteira, SP - Brazil

• Document type: Journal article
• Source: SILICON; v. 11, n. 1, p. 267-276, FEB 2019.
• Web of Science Citations: 0

Abstract

A composite prepared from titanium (IV) silsesquioxane and phosphoric acid (TTiP) was prepared and occluded into the H-FAU zeolite (ZTTiP). The material was chemically modified with nickel and subsequently by potassium hexacyanoferrate (III) (ZTTiPNiH). It was preliminarily characterized by infrared spectroscopy (IR), energy dispersive X-ray spectroscopy (EDS) and cyclic voltammetry (CV). The voltammetric behavior of ZTTipNiH was obtained employing a modified graphite paste electrode (GPE) showing one well-defined redox couple with a formal potential of E?= 0.51V (vs Ag/AgCl(sat)), KCl (3M) (20% w/w; v = 20 mV s(-1); KCl; 1.00 mol L-1) corresponding to the (NiFeII)-Fe-II(CN)(6)/(NiFeIII)-Fe-II(CN)(6) redox process. After rigorous voltammetric studies, the GPE modified with ZTTiPNiH was applied for facile and rapid detection of sulfite. From the analytical curve, a linear response was obtained in a concentration range of 0.05 to 0.80 mmol L-1 and a detection limit (3 sigma) of 0.05 mmol L-1 with a relative standard deviation of 4.21% (n = 3) and an amperometric sensitivity of 14.42 mA L mol(-1) for sulfite. (AU)

• 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