Photocatalytic decolorization of basic dye by TiO 2 nanoparticle in photoreactor
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Publication Details
Author list: Chanathaworn J., Bunyakan C., Wiyaratn W., Chungsiriporn J.
Publisher: Prince of Songkla University
Publication year: 2012
Journal: Songklanakarin Journal of Science and Technology (SJST) (0125-3395)
Volume number: 34
Issue number: 2
Start page: 203
End page: 210
Number of pages: 8
ISSN: 0125-3395
Languages: English-Great Britain (EN-GB)
Abstract
Photocatalytic decolorization of rhodamine B (RB) and malachite green (MG) basic dyes in aqueous solution was evaluated using TiO 2 powder as a semiconductor photocatalyst under UV black light irradiation. A 0.5 L batch photoreactor containing dyeing solution was installed in a stainless steel chamber with air cooling under irradiation. The TiO 2 powder was characterized by XRD observation and it was shown that the nanoparticles could be identified as 73 nm anatase crystals. The effects of operational parameters such as light intensity (0-114 W/m 2), initial dye concentration (10-30 mg/L), and TiO 2 powder loading (0.5-1.5 g/L) on the decolorization of dye samples were examined. The photocatalytic decolorization rate depended on the pollutant's structure, such that the MG dye could be removed faster than the RB dye. Decolorization efficiency (%) of the photocatalytic system increased with increasing TiO 2 loading and light intensity; however, it decreased with increasing initial dye concentration. A loading of 1.5 g TiO 2/L, initial dye concentration of 20 mg/L, and light intensity of 114 W/m2 were found to yield the highest removal efficiency of dye solution based on time requirement. The kinetics are of first order and depend on the TiO 2 powder loading and dye structure. The research had a perfect application foreground.
Keywords
Photoreactor, Uv light irradiation
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