Eletroatividade para peróxido de hidrogênio de um filme de sílica aminofuncionalizada contendo nanoclusters de silicotungstato

Materia

article

Julia Helena de Paula¹  Victória de Oliveira Margarido¹  Adriano Lopes de Souza¹ 

[1] Universidade Federal de São Carlos

关键词: Polyoxometalate;    Sol-Gel Process;    Hydrogen Peroxide;    Organic-Inorganic Hybrid Film;    Ormosil;   

DOI  :  10.1590/1517-7076-RMAT-2021-44906

学科分类：工程和技术（综合）

来源: Universidade Federal do Rio de Janeiro * Coordenacao dos Programas de Pos-Graduacao de Engenharia

【 摘 要 】

Hydrogen peroxide (H2O2) is a powerful oxidizing agent used, for example, in advanced oxidative processes and glucose biosensors. Although the electroreduction reaction of H2O2 has been studied using polyoxometalate (POM) nanoclusters as electrocatalysts, there are not data available in the literature reporting such study using POM nanoclusters immobilizated in hybrid materials as organically modified silicate (ormosil) by sol-gel process. In this study, electrocatalytic properties of a hybrid ormosil film containing 3-aminopropyltriethoxysilane (APTS) and silicotungstic acid (HSiW), a Keggin type POM cluster, toward H2O2 have been evaluated. Cyclic voltammetry experiments showed that H2O2 was electroreduced by this hybrid ormosil film at – 0,17 V vs. Ag/AgCl in acidic medium, pH 3,0, and in the concentration range from 4,6 x 10-4 mol L−1 to 2,3 x 10−3 mol L−1. 31P Nuclear Magnetic Resonance Spectrum indicated that HSiW clusters maintained their structures in the ormosil network. Fourier Transform Infrared Spectrum demonstrated that HSiW and the ormosil network interact through electrostatic interactions. These findings indicate that the hybrid ormosil with APTS and HSiW can contribute to the field of H2O2 recognition.

【 授权许可】

CC BY