Synthesis of TiO2-SiO2 nanocomposite by sol-gel method for photocatalytic removal of dye: potential application for dye industry
Keywords:composites; , oxides semiconductors; , Sol-gel; , optical properties; , X-ray diffraction
Sol-Gel technique was employed to synthesize TiO2-SiO2 nanocomposites using Titanium (IV) isopropoxide (TTIP) as a precursor of TiO2 in acidic pH. Silica sol was prepared using Tetraethyl orthosilicate (TEOS) and mixed with Titania solution. HNO3 was used as a peptizing agent. Gel formation was obtained at room temperature followed by drying at 100°C and calcination at four different temperatures viz. 500°C, 550°C, 600°C and 700°C. The mean crystallite size of the particles was calculated from X-ray diffraction using Scherrer’s equation. Samples calcined at 550°C, showed minimum mean crystallite size (6.42nm). Surface morphology was observed from Field emission scanning electron microscopy. Fourier-transform infrared spectroscopy spectra confirmed the existence of Ti-O-Ti, Si-O-Si and Si-O-Ti bond. Methylene blue was used as model dye for observing photocatalytic activity of nanocomposite material. About 99% dye removal was obtained after 20 min of adsorption and 10 min of UV-irradiation using 70:30 ratio of TiO2: SiO2 nanocomposite (2g/L)
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