Voltammetric Behaviour of an Electroactive of Zn2+ - octa(aminopropyl)silsesquioxane nanocoposite : An Application to 4-Chlorophenol Detection in Tap Water

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Franco, Fernanda dos Santos ; Peixoto, Murilo Santos ; Baroni, Abner Santos ; Felipe, Alexsandro dos Santos ; Pereira Barbosa, Priscila Fernanda ; Maraldi, Vitor Alexandre ; Lima Freitas, Rebeca Moreira ; Vicente Da Silva, Stefani Fernanda ; Alves, Vanessa Petronilia ; Couto Moraes, Alvaro Adriano ; dos Reis, Idalci Cruvinel ; do Carmo, Devaney Ribeiro

• Document type: Journal article
• Source: International Journal of Electrochemical Science; v. 17, n. 5, p. 16-pg., 2022-05-01.

Abstract

This paper presents the voltammetric behavior of electroactive metallosilsesquioxane and their use in the detection of 4-CP. The metallosilsesquioxane was synthesized in two steps. First by direct reaction between hydrochloride octa(aminopropyl)silsesquioxane (POSS-NH3+Cl-) and Zn2+ a second by electrostatic interaction with [FeCN6](4-) (SZnFe). The nanostructured material showed a well-defined three redox couples with formal potential (E9') of approximately 0.33, 0.78 and 1.01 +/- 0.01V (vs Ag/AgCl). Voltammetric analysis showed that the formal potential (E-theta') strongly depends on concentration and electrolyte type, but the system remained unchanged with pH values between 2 and 8. The SZnH graphite paste electrode exhibits a sensitive and catalytic oxidation response for the detection of 4-CP. For detection of 4-CP, the modified graphite paste electrode had a linear range of 6.0x 10(-7) to 6.0x 10(-5) mol L-1 with a limit of detection of 5.3 x10(-6) mol L-1 and a sensitivity of 0.53 A/mol L-1. This electrode could be used to detect 4-CP in tap water. (AU)

• FAPESP's process: 15/20397-8 - Surface modification of graphene oxide with a dendrimer: A study of hybrid nanostructured materials for chemical and biological applications
• Grantee: Devaney Ribeiro Do Carmo
• Support Opportunities: Regular Research Grants