A novel amperometric catechol biosensor based on α-Fe2O3 nanocrystals-modified carbon paste electrode

In this work, we designed an amperometric catechol biosensor based on α-Fe2O3 nanocrystals (NCs) incorporated carbon-paste electrode. Laccase enzyme is then assembled onto the modified electrode surface to form a nanobiocomposite enhancing the electron transfer reactions at the enzyme’s active metal centers for catechol oxidation. The biosensor gave good sensitivity with a linear detection response in the range of 8–800 μM with limit of detection 4.28 μM. We successfully employed the sensor for real water sample analysis. The results illustrate that the metal oxide NCs have enormous potential in the construction of biosensors for sensitive determination of phenol derivatives

One pot molten salt synthesis and photocatalytic studies of magnetically separable copper ferrite microcrystals

The preparation of tetragonal and cubic structured CuFe2O4 microcrystals by the one-pot molten salt synthesis in a eutectic mixture of NaCl - KCl molten salts at 800–900 °C is reported. Phase evolution and single-phase formation of CuFe2O4 on temperature and soaking period effect were studied. The structure and morphology of the synthesized compounds were investigated using techniques such as powder X-ray diffraction, Fourier-transform infrared spectroscopy, and scanning electron microscopy. Microscopy studies revealed microcrystals of CuFe2O4 in an octahedron morphology. Photoluminescence and X-ray photoelectron spectroscopy analysis revealed the existence of surface oxygen defects on both prepared compounds. The photocatalytic studies of tetragonal and cubic structured CuFe2O4 catalysts shown 89% and 93% degradation of the Rhodamine-B (RhB) dye, respectively, under UV-A (366 nm) irradiation in 90 min. Photocatalytic and magnetic studies indicate that these CuFe2O4 samples are suitable magnetic separable photocatalysts for efficient dye degradation, and can be reasonably reused.Fil: Koppala, Sivasankar. Kunming University Of Science And Technology; ChinaFil: Balan, Ramdas. Cmr Institute Of Technology; IndiaFil: Litter, Marta Irene. Universidad Nacional de San Martín. Instituto de Investigación e Ingeniería Ambiental. - Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Parque Centenario. Instituto de Investigación e Ingeniería Ambiental; ArgentinaFil: Xu, Lei. Kunming University Of Science And Technology; ChinaFil: Li, Kangqiang. Beihang University; ChinaFil: Liu, Hua. Ecole Centrale de Lille Cit´e Scientifique; FranciaFil: Lekshmi, I.C.. Cmr Institute Of Technology; IndiaFil: Begam Mohamed, Rigana. No especifíca