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

• Published in: International journal of electrochemical science 2022-05, Vol.17 (5), p.220512, Article 220512
• Main Authors: dos Santos Franco, Fernanda, Peixoto, Murilo Santos, Baroni, Abner Santos, dos Santos Felipe, Alexsandro, Barbosa, Priscila Fernanda Pereira, Maraldi, Vitor Alexandre, Freitas, Rebeca Moreira Lima, Da Silva, Stefani Fernanda Vicente, Alves, Vanessa Petronília, Moraes, Alvaro Adriano Couto, dos Reis, Idalci Cruvinel, do Carmo, Devaney Ribeiro
• Format: Article
• Language: English
• Subjects: 4-Chlorophenol; Graphite Paste Electrode; Metallosilsesquioxane; Octa(aminopropyl)silsesquioxane; Prussiam blue analogs; Voltammetry
• ISSN: 1452-3981; 1452-3981
• DOI: 10.20964/2022.05.25

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 (Eθ') of approximately 0.33, 0.78 and 1.01 ± 0.01V (vs Ag/AgCl). Voltammetric analysis showed that the formal potential (Eθ') 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 6.0×10-7 to 6.0×10-5 mol L-1 with a limit of detection of 5.3 ×10-6 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.