K. Rudresha; A. Zahir Hussain; Ravikumar C. R.; M. R. Anil Kumar; Nagaswarupa H. P.; M. S. Santosh; H. C. Ananda Murthy
Abstract
The green CuO NPs were successfully synthesised by green solution combustion method. The average crystallite size of green solution combustion CuO nanoparticles (gsc-CONPs) was found to be 40.64 nm and confirmed by powder X-ray diffraction (PXRD) analysis. The UV-DRS spectrum revealed average energy ...
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The green CuO NPs were successfully synthesised by green solution combustion method. The average crystallite size of green solution combustion CuO nanoparticles (gsc-CONPs) was found to be 40.64 nm and confirmed by powder X-ray diffraction (PXRD) analysis. The UV-DRS spectrum revealed average energy gap of 1.75 eV for gsc-CONPs. Cyclic voltammetry (CV) and Electrochemical impedance spectroscopy (EIS) techniques have been employed to analyse the electrochemical properties of the synthesized sample by using carbon paste electrodes in 1M KOH solution. The observed results suggest superior electrochemical properties of gsc-CONPs electrode due to its lower value of EO-ER. It also exhibited better sensor characteristics for paracetamol and glucose molecules. The proton diffusion coefficient (D) for the gsc-CONPs electrode material was found to be 1.134 × 10-4 cm 2 s -1 . The g-CONPs have also been tested for its photocatalytic activity using indigo carmine (IC) dye. The mechanism suggests that the crucial role was played by OH radicals during dye degradation. The results support the claim of the synthesized gsc-CONPs as a promising material for photocatalytic and supercapacitor applications.
Husien A. Abbas; Tarek S. Jamil
Abstract
Nano-sized SrTiO3 and SrTi0.7Fe0.3O3 photocatalysts were prepared by the complex route precursor method. The prepared photocatalysts were characterized by XRD, TEM, XPS and diffuse reflectance. The effect of iron doping on the structural properties and the photocatalytic activity was studied. All the ...
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Nano-sized SrTiO3 and SrTi0.7Fe0.3O3 photocatalysts were prepared by the complex route precursor method. The prepared photocatalysts were characterized by XRD, TEM, XPS and diffuse reflectance. The effect of iron doping on the structural properties and the photocatalytic activity was studied. All the prepared samples have single cubic perovskite structure. It was found that doping of SrTiO3 with Fe shifted the peak positions toward higher 2θ value, decreased both the cubic lattice parameter and the unit cell volume, decreased the average crystallite size of SrTiO3 from 53 nm to 35 nm and shifted the absorption to the visible light range (red shift). The photocatalytic degradation activity of 30 mole % Fe doped SrTiO3 was significantly improved the degradation of dibutyl phthalate in 90 minutes under visible light irradiation by 4 times higher than SrTiO3.
Tanmay K. Ghorai; Prasanta Dhak
Abstract
Mesoporous titania adapted chromium-niobate nanocatalysts CrxNbxTi1-2xO2-x/2 (x = 0.01-0.2) were synthesized by a new synthetic approach, using N,N,N',N'-tetrakis(2-hydroxyethyl)ethylenediamine (edteH4) precursors and their photocatalytic activities were investigated. TiO2 nanomaterials have ...
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Mesoporous titania adapted chromium-niobate nanocatalysts CrxNbxTi1-2xO2-x/2 (x = 0.01-0.2) were synthesized by a new synthetic approach, using N,N,N',N'-tetrakis(2-hydroxyethyl)ethylenediamine (edteH4) precursors and their photocatalytic activities were investigated. TiO2 nanomaterials have continued to be highly active in photocatalytic applications because these are useful to break down the organic molecules in water for endorsing the diffusion of reactants and products. CrxNbxTi1-2xO2-x/2 (x = 0.01)(CNT1) nanoparticles with the smaller particle sizes 12±1 nm and have mesoporous characteristics (SBET = 162 m 2 g −1 ). The energy band gap of CNT1 was found 1.85 eV obtained from optical emission spectrum. The XRD peaks revealed a mixture of anatase and rutile phases in the synthesized powders. EPR spectroscopy showed the characteristic features of Nb 5+ ions, whose existence was confirmed by XPS. The CNT1 powders display good (2.5 times greater) photocatalytic activity for degradation of Rhodamine B (RhB) as opposed to pure anatase TiO2 and other compositions of CrxNbxTi1-2xO2-x/2.