Characterization of Mn-nanoparticles decorated organo-functionalized SiO2–Al2O3 mixed-oxide as a novel electrochemical sensor: application for the voltammetric determination of captopril

Abstract

In this work a new sensor in nano size containing Mn-nanoparticles decorated organo-functionalized nanosized SiO 2 -Al 2 O 3 mixed-oxide support was developed as a new electrocatalysis for oxidation of organic compounds such as captopril. SiO 2 -Al 2 O 3 mixed-oxide were functionalized with Schiff base ligand and thereatfer, in the next step, Mn-nanoparticles were prepared over the organofunctionalized SiO 2 -Al 2 O 3 mixed-oxide. The synthesized materials were characterized with different methods such as FT-IR spectroscopy, UV-vis, CHN elemental analysis, TEM, ICP-OES, cyclic voltammetry, and electrochemical impedance spectroscopy. Under the optimum conditions (pH 7.0) in cyclic voltammetry, the oxidation of the captopril was occurred at a potential about 650 mV at a surface of the modified electrode. Linear sweep voltammetry exhibited two wide linear dynamic ranges of 0.30-5.0 and 5.0-340 mmol L À1 captopril. The detection limit was found to be 0.095 mmol L À1 captopril. The kinetic parameters such as electron transfer coefficient and catalytic reaction rate constant were also determined. Finally, the modified electrode used as a novel electrochemical sensor for the determination of captopril in real samples such as pharmaceutical, patient and safe human urine.

Synthesis and Characterization of Zinc Oxide and Iron Oxide Nanoparticles Using Sesbania grandiflora Leaf Extract as Reducing Agent

“…Wide varieties of methods have been reported for synthesis of zinc oxide and iron oxide nanoparticles such as coprecipitation technique [2], thermal decomposition methods [3], hydrothermal technique [4], sol gel method [5], and electrochemical methods [6]. However these methods are energy consuming, using hazardous solvents and expensive reagents in their preparation [7,8]; therefore the rising needs to develop eco-friendly green method for nanoparticle preparation [9].…”

Recent advances in solid-phase sorbents for sample preparation prior to chromatographic analysis

“…Nowadays, metallic nanomaterials used as SPSs reportedly include Fe3O4, TiO2, Al2O3, ZrO2, MnO, and CeO2, modified with functional coatings [40][41][42][43][44][45][46][47]. Among them, magnetic NPs (MNPs) are particularly useful for extracting and enriching a large volume of target analytes, because they can provide high surface area-to-volume ratio, easy surface modification and strong magnetism [48].…”

“…Among the metallic Fe3O4, TiO2, Al2O3, ZrO2, MnO and CeO2 nanomaterials modified with functional coatings as SPSs [40][41][42][43][44][45][46][47], TiO2 nanomaterials are also commonly used. As a new TiO2 nanomaterial, TiO2 nanotubes (NTs) have often been used as the photo catalyst for photo degradation.…”

Voltammetric determination of hydroxylamine in water and waste water samples using a NiO nanoparticle/new catechol derivative modified carbon paste electrode

“…In operation, the redox active sites shuttle electrons between the analyte and the electrodes with a significant reduction in activation overpotential [11]. A further advantage of chemically modified electrodes is that they are less prone to surface fouling and oxide formation, compared to inert substrate electrodes [12][13][14]. A wide variety of compounds have been used as electron transfer mediators for the modification of electrode surfaces in various procedures [15][16][17].…”