Abstract
The photocatalytic degradation of indigo carmine (IC) dye was carried out by using TiO2/Fe2O3 nanocomposite prepared by impregnation method under UV light irradiation. The effect of TiO2 to Fe2O3 mole ratio on the properties and photocatalytic activity of TiO2/Fe2O3 nanocomposite was studied by the prepared three series of TiO2/Fe2O3 nanocomposites with TiO2 to Fe2O3 mole ratio of 1:3, 1:1 and 3:1. The characterization of TiO2/Fe2O3 nanocomposite by XRD showed that the iron (III) oxide extracted from iron ore and calcined at 700°C was in hematite phase (a-Fe2O3). The photocatalytic activity of TiO2/Fe2O3 nanocomposites was determined by using 6 W UV lamps with the wavelength 365 nm and the degradation efficiency of indigo carmine was determined based on UV-Vis spectrophotometer data. The TiO2/Fe2O3 nanocomposite with the the mole ratio of TiO2 to Fe2O3 1:3 showed higher photocatalytic activity than other mole ratio and bare Fe2O3. Degradation efficiency also was highly affected by the initial pH of IC solution, photocatalyst dosage and initial IC concentration. The maximum experimental degradation efficiency of IC was achived at pH value 1 using 0.35 g of photocatalyst and at 20 ppm of initial IC concentration after being irradiated by UV light for 120.
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