Photocatalytic reduction of chromium (VI) in aqueous solutions by nano-TiO2 thin film in rotating disc photoreactor Online publication date: Thu, 26-May-2016
by Jirapat Ananpattarachai; Pattaranit Paksaharn; Puangrat Kajitvichyanukul
International Journal of Environment and Waste Management (IJEWM), Vol. 17, No. 2, 2016
Abstract: A new photocatalytic reactor design for water treatment was characterised by the use of rotating disc photocatalytic reactor. In this study, TiO2 was immobilised on stainless steel disc by sol-gel method. Experiments in a reactor containing 20 rotating disc with UV light irradiation at the wavelength of 380 nm were performed. The effect of the wastewater flow rate and rotating disc speed on photocatalytic reduction of chromium(VI) over TiO2/stainless steel disc was determined. The chromium(VI) was effectively reduced in a wide range, and the rate of photocatalytic reduction increases with an increase of rotating speed and flow rate. A thin film of liquid becomes entrained on the disc enhancing the high efficacy in chromium (VI) removal from wastewater during the rotation of the disc. The kinetics study of this photoreactor was also investigated.
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