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Carbon nanotube-based nanocomposite sensor tuned with a catechol as novel electrochemical recognition platform of uranyl ion in aqueous samples

AuthorsMuñoz, Jose; Montes, Raquel; Bastos-Arrieta, Julio; Guardingo, Mireia ; Busqué, Félix; Ruiz Molina, Daniel ; Palet, Cristina; García-Orellana, Jordi; Baeza, Mireia
Supramolecular chemistry
Carbon paste electrode
Gold nanoparticles
Water pollutants
Issue Date2018
CitationSensors and Actuators B: Chemical 273: 1807-1815 (2018)
AbstractThis article reports a novel electrochemical recognition platform based on a nanocomposite carbon paste electrode containing carbon nanotubes modified with gold nanoparticles carrying a thiolated catechol for the fast amperometric determination of uranyl ion (UO22+) in water. Recognition of UO22+ is accomplished by supramolecular chemistry due to the formation of an inclusion complex between catechol and UO22+. The amperometric device operates at –0.40 V vs. Ag/AgCl, where the reduction of UO22+ takes place on the electrode surface, covering a linear range from 0.49 to 170 μg L−1 UO22+ in a 0.1 M boric acid buffer solution at pH 5.3. The developed sensing system presents good response towards UO22+ in aqueous environmental samples, with good selectivity over other browsed cations and can be easily reset by simple polishing. This platform has demonstrated to be a potential alternative regarding to the common standard bench-top analytical techniques for the development of in-field devices for in-situ monitoring.
Publisher version (URL)https://doi.org/10.1016/j.snb.2018.07.093
Appears in Collections:(CIN2) Artículos
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