Open AccessMagnetic and Mesoporous Silica-Niobia Material as Modifier of Carbon Paste Electrode for p-Nitrophenol Electrochemical Determination
Author(s) -
Oleg Tkachenko,
Danielle S. da Rosa,
Anike H. Virgili,
Marcos Antônio Zen Vasconcellos,
Tânia Maria Haas Costa,
Leliz Ticona Arenas,
Marion Deon,
Edílson V. Benvenutti,
Eliana Weber de Menezes
Publication year - 2021
Publication title -
journal of the brazilian chemical society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.337
H-Index - 70
eISSN - 1678-4790
pISSN - 0103-5053
DOI - 10.21577/0103-5053.20200215
Subject(s) - mesoporous material , materials science , differential pulse voltammetry , electrochemistry , electrode , carbon paste electrode , detection limit , inorganic chemistry , nitrophenol , carbon fibers , mesoporous silica , 4 nitrophenol , magnetite , selectivity , cyclic voltammetry , chemical engineering , chemistry , catalysis , nanotechnology , nanoparticle , composite material , chromatography , metallurgy , organic chemistry , composite number , engineering
In the present work, the sol-gel synthesis method was employed as strategy to obtain a magnetic and mesoporous silica-niobia material. The planned synthesis was based on the heterocondensation of niobium and silicon alkoxide precursors, in the presence of spherical magnetite particles. The resulting material presented interesting characteristics such as magnetism, large mesopores, in the range from 20 to 50 nm, and 68 m2 g−1 of surface area. These features allowed its use as modifier of carbon paste electrode for p-nitrophenol determination, since niobia has never been used in electrochemical sensors for the determination of nitrophenol compounds. By using differential pulse voltammetry technique, the electrode can be applied in a wide range of p-nitrophenol concentration, from 10 to 490 μmol L−1, with a limit of detection of 1.2 µmol L−1 and sensitivity up to 0.60 µA L µmol−1. The proposed electrode presented good sensitivity and selectivity and it was applied in real water samples.