Hazra Chowdhury, Ipsita and Roy, M and Kundu, S and Naskar, Mrinal Kanti (2019) TiO2 hollow microspheres impregnated with biogenic gold nanoparticles for the efficient visible light-induced photodegradation of phenol. Journal of Physics and Chemistry of Solids, 129. pp. 329-339. ISSN 0022-3697

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Abstract

In this study, titania hollow microspheres were prepared via sol-gel process followed by autoclaving at 180 degrees C for 20 h using titanium (IV) oxysulfate and ammonium fluoride. Different amounts of Au in a water-dispersible sol obtained from carambola fruit extract at room temperature were incorporated into the synthesized TiO2 to prepare Au/TiO2 nanocomposite. The physicochemical properties of the synthesized products were studied by X-ray diffraction, Fourier transform infrared spectroscopy, Raman spectroscopy, X-ray photoelectron spectroscopy, N(2 )adsorption-desorption analysis, ultraviolet-diffuse reflectance spectroscopy, photoluminescence spectroscopy, field emission scanning electron microscopy, and transmission electron microscopy. The prepared Au/TiO2 nanocomposite was applied to study the photocatalytic degradation of phenol (a toxic organic pollutant) under irradiation by visible light. The Au/TiO2 nanocomposite containing 5 wt% Au had the smallest band gap energy of 2.24 eV and the maximum photocatalytic efficiency (95%), where it decomposed 97.5% of the organic pollutant after irradiation by visible light for 1 h.

Item Type:	Article
Subjects:	Engineering Materials
Divisions:	Sol Gel
Depositing User:	Bidhan Chaudhuri
Date Deposited:	08 Nov 2019 07:04
Last Modified:	08 Nov 2019 07:04
URI:	http://cgcri.csircentral.net/id/eprint/4579

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