A New Composite Based on Electroactive Zirconium Phosphate: Morfology, Structure and Their Behavior as a Voltammetric Sensor in the Ascorbic Acid Detection

Author(s)

Do Carmo, Devaney Ribeiro ^[1] ; Serantoni da Silveira, Tayla Fernanda ^{[1, 2]}

Affiliation

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

^[2] Univ Fed Mato Grosso do Sul, Inst Quim, Ave Senador Filinto Muller 1555, BR-79074460 Campo Grande, MS - Brazil

• Document type: Journal article
• Source: Journal of Inorganic and Organometallic Polymers and Materials; v. 29, n. 4, p. 1205-1218, JUL 2019.
• Web of Science Citations: 0

Abstract

An electroactive and chemically stable composite was obtained from zirconium (IV) isopropoxide (ZrI) and phosphoric acid (ZrP). The ZrP was characterized by techniques such as Fourier transform infrared spectroscopy, C-13 and P-31 nuclear magnetic resonance, X-ray diffraction, scanning electron microscopy, energy dispersive X-ray spectroscopy, thermogravimetric analysis, X-ray photoelectron spectroscopy, surface area and porosity and cyclic voltammetry. Voltammetric behaviour of the ZrP was obtained using of a modified graphite paste electrode in a potential range from -0.20 to 1.00V (vs Ag/AgCl). ZrP showed one redox couple with average potential E = 0.30V (vs Ag/AgCl(sat.)) (40% w/w; v=20mV s(-1); KCl; 1.00mol L-1). It was tested on electrocatalytic detection of ascorbic acid using cyclic voltammetry and square wave voltammetry. The modified electrode showed a detection limit of 2.4x10(-5) mol L-1, with relative standard deviation of +/- 3% (n=3) and amperometric sensitivity of 11.7mA/mol L-1 (R=0.999) by using the cyclic voltammetry technique and a detection limit of 1.10x10(-4) mol L-1 with relative standard deviation of +/- 2% (n=3) and amperometric sensitivity of 126.9mA/mol L-1 (R=0.998) by using the square wave voltammetry technique. (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
• FAPESP's process: 13/08495-9 - Porous materials and composites chemically modified with zirconium (IV) and phosphoric acid: Preparation and electroanalytical applications.
• Grantee: Tayla Fernanda Serantoni da Silveira
• Support type: Scholarships in Brazil - Doctorate