A high-performance electrochemical sensor based on a mesoporous silica/titania material and cobalt(II) phthalocyanine for sensitive pentachlorophenol determination.

Autor: de Barros MR; ampere - Laboratório de Plataformas Eletroquímicas - Universidade Federal de Santa Catarina - Departamento de Química, Florianópolis, SC, 88040-900, Brazil., Winiarski JP; ampere - Laboratório de Plataformas Eletroquímicas - Universidade Federal de Santa Catarina - Departamento de Química, Florianópolis, SC, 88040-900, Brazil., de Matos Morawski F; ampere - Laboratório de Plataformas Eletroquímicas - Universidade Federal de Santa Catarina - Departamento de Química, Florianópolis, SC, 88040-900, Brazil., Marim RG; LEMA- Laboratório de Espectrometria Atômica E de Massa - Universidade Federal de Santa Catarina - Departamento de Química, Florianópolis, SC, 88040-900, Brazil., Chaves ES; LEMA- Laboratório de Espectrometria Atômica E de Massa - Universidade Federal de Santa Catarina - Departamento de Química, Florianópolis, SC, 88040-900, Brazil., Blacha-Grzechnik A; Faculty of Chemistry, Silesian University of Technology, Strzody 9, 44-100, Gliwice, Poland., Jost CL; ampere - Laboratório de Plataformas Eletroquímicas - Universidade Federal de Santa Catarina - Departamento de Química, Florianópolis, SC, 88040-900, Brazil. cristiane.jost@ufsc.br.
Jazyk: angličtina
Zdroj: Mikrochimica acta [Mikrochim Acta] 2022 Jul 05; Vol. 189 (8), pp. 269. Date of Electronic Publication: 2022 Jul 05.
DOI: 10.1007/s00604-022-05360-z
Abstrakt: The synthesis and characterization of a novel titania/silica hybrid xerogel subsequently modified with 4-methylpyridine (4-Pic), named TiSi4Pic + Cl -  is reported. The physicochemical, structural and thermal properties of TiSi4Pic + Cl - were characterized using several techniques. Anchoring cobalt(II) phthalocyanine (CoTsPc) in TiSi4Pic + Cl - showed greater electroanalytical sensitivity over other sensors built with these materials. A novel electroanalytical method was developed to quantify the noxious biocide pentachlorophenol (PCP) for environmental monitoring. The peak current intensity increased linearly with the analyte concentration in the range between 0.99 and 4.21 μmol L -1 , based on the oxidation process (at + 0.81 V, vs. Ag/AgCl) of differential pulse voltammetry (DPV). The estimated limit of detection (LOD) was 29 nmol L -1 . Recovery tests in environmental samples showed a PCP concentration of 2.05 ± 0.03 μmol L -1 (n = 3). The method was statistically validated by comparing the PCP concentrations with those obtained by molecular absorption spectrometry and high-performance liquid chromatography-diode array detection (HPLC-DAD). At a 95% confidence level, no difference between the results was found, therefore confirming the excellent accuracy of the proposed method.
(© 2022. The Author(s), under exclusive licence to Springer-Verlag GmbH Austria, part of Springer Nature.)
Databáze: MEDLINE
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