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Synthesis, characterization, structural and optical properties of titanium-dioxide nanoparticles using Glycosmis cochinchinensis Leaf extract and its photocatalytic evaluation and antimicrobial properties

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Rosi H., Kalyanasundaram S.
World News of Natural Sciences
|
2018
|
vol. 17
1-15
EN
The present study reports on the development of an Eco-friendly, nontoxic, inexpensive and low cost effective method for green synthesis of titanium dioxide nanoparticles, using Glycosmis cochinchinensis leaf extract. X-Ray diffraction (XRD), Ultraviolet spectral studies (UV-Vis), Fourier transform infrared (FTIR) spectroscopy, Scanning electron microscopy and Energy dispersive spectrometry (SEM–EDS) and Transmission electron microscopy (TEM) were used to characterize the TiO2 nanoparticles, while the application of TiO2 nanoparticles was assessed and antimicrobial activity was evaluated photocatalytically. XRD studies indicated that the titanium dioxide nanoparticles were crystalline in nature and in the anatase phase. According to our derived data, TiO2 nanoparticles exhibited maximum absorbance peak at 430 nm in UV-Vis spectroscopy and the band gap energy was to be found to be 3.02 eV. FTIR spectral studies confirm that flavonoids and proteins are the stabilizing agents of the TiO2 nanoparticles. The SEM and TEM images indicate that the morphology of the product is spherical nanoparticles with an average particle size of 40 ±5 nm with standard deviation. The antibacterial activity of the TiO2 nanoparticles was tested against gram positive bacteria (S. saprophyticus and B. subtilis) and gram negative bacteria (E. coli and P. aeruginosa). Accordingly, maximum zone of inhibition was observed against gram negative bacteria. The antifungal activity of the TiO2 nanoparticles was then tested against Aspergillus niger and Trichoderma reesei. Herein, maximum zone of inhibition was found to be 60 mm against T.reesi. Hence, Glycosmis cochinchinensis leaf extract green synthesized TiO2 nanoparticles can be considered to be an effective antimicrobial agent.
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