Magnetic and Mesoporous Silica-Niobia Material as Modifier of Carbon Paste Electrode for p-Nitrophenol Electrochemical Determination

In the present work, sol-gel synthesis method was employed as strategy to obtain a magnetic and mesoporous silica-niobia material. The planned based on heterocondensation of niobium silicon alkoxide precursors, in presence spherical magnetite particles. resulting material presented interesting characteristics such magnetism, large mesopores, range from 20 50 nm, 68 m2 g−1 surface area. These features allowed its use modifier carbon paste electrode for p-nitrophenol determination, since niobia has never been used electrochemical sensors determination nitrophenol compounds. By using differential pulse voltammetry technique, can be applied wide concentration, 10 490 μmol L−1, with limit detection 1.2 µmol L−1 sensitivity up 0.60 µA L µmol−1. proposed good selectivity it real water samples.