Noble metals (NM) and semiconductors nanoparticles have been widely investigated to solve a lot of environmental, health, technological and society issues. The technological advancement made so far through the application of nanotechnology has necessitated this study. The major shift in the photonic emission exhibits the impact of second-generation dendrimer (G2) on the luminescence property of the synthesized sample and promises favourable results in optoelectronic and photocatalytic applications. From the PL study, it was evident that the sample emitted photons at 601 nm to the orange region of the visible spectrum confirming a remarkable shift in the wavelength of photonic emission when compared to that of zeroth-generation stabilizer in core–shell nanoparticles. The energy bandgap was calculated using Tau Plot and was found to be direct bandgap of 3.80 eV and 3.85 eV for G1 and G2 samples, respectively. The optical properties of the sample were analysed using UV–Visible spectra and photoluminescence (PL) studies. The selected area electron diffraction and XRD analyses exhibited the tetragonal primitive crystal structure with dhkl = 2.3 Å, 1.6 Å and 1.2 Å. From the XRD values obtained, the average crystallite size and lattice strain of the samples and were calculated using Scherrer formula and the results were compared with size–strain plot. The structural properties were identified using X-ray diffraction (XRD) measurements and transmission electron microscope images. All rights core–shell nanoparticles were synthesized by a simple, low-cost method using generation 1 (G1) and generation 2 (G2) triazolyl chalcone dendrimer as stabilizing agent. The reduction of aquatic bacterial densities by photocatalytically active core-shell nanocomposite in presence of natural sun-light may have potential ex situ application in water decontamination at ambient conditions.Ĭopyright © 2014 Elsevier B.V. Nanocomposite system has shown optimum disinfection (≈98%) at 40-60min of sun-light exposure with a catalyst loading of 0.5mg/L of the reaction solution. Disinfection efficiency in laboratory as well as real water samples was compared with that of pure-ZnO and TiO2 (Degussa P25). Effect of photocatalyst loading and reaction temperature on the disinfection kinetics was studied. Silver nanoparticles are synthesized by the reduction of silver perchlorate followed by precipitation of zinc oxide shell and are employed in the photocatalytic disinfection of the model pathogen. Disinfection of Gram-negative bacterium Vibrio cholerae 569B in aqueous matrix by solar-photocatalysis mediated by core-shell structure nanocomposite particles was investigated.
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