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

Autor(es)

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

Afiliação do(s) autor(es)

^[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

• Tipo de documento: Artigo Científico
• Fonte: Journal of Inorganic and Organometallic Polymers and Materials; v. 29, n. 4, p. 1205-1218, JUL 2019.
• Citações Web of Science: 0

Resumo

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)

• 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: 13/08495-9 - Materiais porosos e compósitos quimicamente modificados com zircônio (IV) e ácido fosfórico : Preparação e aplicações eletroanalíticas
• Beneficiário: Tayla Fernanda Serantoni da Silveira
• Modalidade de apoio: Bolsas no Brasil - Doutorado