Synthesis of MnCo2O4 nanoparticles as modifiers for simultaneous determination of Pb(II) and Cd(II)

Abstract

The porous spinel oxide nanoparticles, MnCo2O4, were synthesized by citrate gel combustion technique. Morphology, crystallinity and Co/Mn content of modified electrode was characterized and determined by Fourier transform infra-red spectroscopy (FT-IR), scanning electron microscopy (SEM), energy dispersive spectrometry (EDS), X-ray diffraction pattern analysis (XRD), simultaneous thermogravimetry and differential thermal analysis (TG/DTA). Nanoparticles were used for modification of glassy carbon electrode (GCE) and new sensor was applied for simultaneous determination of Pb(II) and Cd(II) ions in water samples with the linear sweep anodic stripping voltammetry (LSASV).The factors such as pH, deposition potential and deposition time are optimized. Under optimal conditions the wide linear concentration range from 0.05 to 40 μmol/dm3was obtained for Pb(II), with limit of detection (LOD) of 8.06 nmol/dm3 and two linear concentration ranges were obtained for Cd(II), from 0.05 to 1.6 μmol/dm3 and from 1.6 to 40 μmol/dm3, with calculated LOD of 7.02 nmol/dm3. The selectivity of the new sensor was investigated in the presence of interfering ions. The sensor is stable and it gave reproducible results. The new sensor was succesfully applied on determination of heavy metals in natural waters.

Voltammetric Determination of Lead and Copper in Wine by Modified Glassy Carbon Electrode

“…They were characterized by Fourier transform infra-red spectroscopy (FT-IR), scanning electron microscopy (SEM), energy dispersive spectrometry (EDS), X-ray diffraction pattern analysis (XRD) and simultaneous thermogravimetry and differential thermal analysis (TG/DTA). The results were published in our previous manuscript 34 .…”

“…It exhibited high sensitivity, selectivity and wide concentration linear range for the determination of cadmium and lead. 34 The quantification of those analytes was interfered by copper ions and the signal for lead was decreased for about 40%, such behaviour was explained by the presence of the sulfate ions, and its effect on copper ions conductivity. For the wine samples, sulfuric acid was avoided, and the oxidation current for copper was significantly lower than for the lead even though it is abundant metal in the wine samples (Figure 1).…”

“…The use of Nafion enhanced the stability of the sensor compared to our previous work. 34 The sensor was used for 30 measurements before the recovery decreased for more than 95%.…”

MnCo2O4 Microflowers Anchored on P-Doped g-C3N4 Nanosheets as an Electrocatalyst for Voltammetric Determination of the Antibiotic Drug Sulfadiazine

“…8,9 Recently, Antunovićet.al reported that the citrate gel combustion technique assisted the synthesis of porous MnCo 2 O 4 spinel oxide for the simultaneous determination of Pb(II) and Cd(II) via linear sweep anodic stripping voltammetry. 10 This reveals itself in the sensing of cationic species and biomolecules using MnCo 2 O 4 spinel materials with surface effects and enhanced charge transfer.…”

“…Various spinel-type crystalline oxides (CoFe 2 O 4 , NiCo 2 O 4 , MnCo 2 O 4 , FeMnO 3 , NiMoO 4 , ZnFe 2 O 4 , and MnFe 2 O 4 ) have been employed for a wide range of applications, attracting a lot of attention. , Among them, manganese (Mn)-based nanomaterials have gained substantial attraction in many fields including optics, sensors, catalysis, electrochemical capacitors, and lithium-ion batteries. − Manganese–cobalt oxide (MnCo 2 O 4 ), in particular, has enhanced structural and surface properties that can be attributed to the synergy between the constituents, making it a suitable candidate for sensing applications. , Zhang and co-workers have synthesized nanostructured MnCo 2 O 4 used for non-enzymatic glucose sensors. , Recently, Antunović et.al reported that the citrate gel combustion technique assisted the synthesis of porous MnCo 2 O 4 spinel oxide for the simultaneous determination of Pb­(II) and Cd­(II) via linear sweep anodic stripping voltammetry . This reveals itself in the sensing of cationic species and biomolecules using MnCo 2 O 4 spinel materials with surface effects and enhanced charge transfer.…”