Abstract
In order to increase the activity of TiO 2 photocatalyst, preparation and characterization of TiO 2 -lignin and its activity on Cr(VI) photoreduction have been carried out. TiO 2 -lignin was prepared by mixing TiO 2 powder with lignin powder in water-ethanol followed by stirring for 24 h and calcination at 400°C. The crystal structure characterizations were performed by X-ray diffraction (XRD), Lignin was identified using FT-IR whereas photoreduction of Cr(VI) was conducted in a batch reactor. The effect of TiO 2 content on TiO 2 -lignin, irradiation time, weight of photocatalyst and initial concentration of Cr(VI) were studied to obtain effectiveness of photoreduction. Activity of TiO 2 -lignin on the photoreduction of Cr(VI) showed higher result than TiO 2 . The increased of TiO 2 content in TiO 2 -lignin result in higher Cr(VI) photoreduction and gave maximum yield at mass ratio of TiO 2 /lignin 2:1. The irradiation time, weight of TiO 2 -lignin photocatalyst and initial concentration of Cr(VI) obtained for maximum Cr(VI) photoreduction are 40 h, 50 mg and 1 mg/L respectively which reduced Cr(VI) by 81.44%. Keywords: TiO 2 -lignin, Cr(VI) ion, photoreduction
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