Work

Interfacial Characterization of the Electrochemical Adsorption of Caffeine on Poly(pyrrole) Nanotubes/Silica

Year: 2025

Type: article

Abstract: High Resolution Image Download MS PowerPoint Slide In this work, a polypyrrole nanotube/silica (PPyNT/SiO 2 )-modified electrode was prepared by an all-electrochemical route and characterized by electrochemical, spectroscopic, and microscopy analyses; scanning electron microscopy confirmed the superimposition of a particulate silica on the PPyNTs without any loss of electroactivity of conducting polypyrrole. The PPyNTs/SiO 2 electrode was employed for the electroadsorption of caffeine, where it was found that in its less oxidized form, the PPyNTs boosted the adsorption capability of intrinsic silica. Electrochemical impedance spectroscopy (EIS) modeling was employed and modeled with equivalent circuit methodology, and all the results were compared with the Sips isotherm model, showing that the PPyNTs/SiO 2 electrode presented a more heterogeneous surface ( n S = 1.25) and a nearly 2-fold increase in maximum adsorption capacity ( q ms ) compared to pristine PPyNTs.

Source: ACS Omega

DOI: 10.1021/acsomega.5c10006

Authors: Tatiana Lima Valerio, Camilla K. Boaron, Luis F. Marchesi, Bruno José G. da Silva, Marcio Vidotti

Institutions: Universidade Federal do Paraná, Universidade Tecnológica Federal do Paraná

Language: English

Topic: Conducting polymers and applications

Subfield: Polymers and Plastics

Field: Materials Science

Domain: Physical Sciences

Open Access status: gold

Estimated APC paid: $1,935

Funders: Fundação de Amparo à Pesquisa do Estado de São Paulo, Coordenação de Aperfeiçoamento de Pessoal de Nível Superior, Conselho Nacional de Desenvolvimento Científico e Tecnológico