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1 2005

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A Study of Photocatalytic Oxidation of Indanthrene Red LGG an Anthraquinone Vat Dye on TiO2

Geetha Balakrishna R., Gomathi Devi L.

Polish Journal of Chemistry

2005

Vol. 79 / nr 5

919-931

Nanometer-sized powder of TiO2 is prepared by chemical methods of gel to crystalline conversion. The crystallite sizes obtained are in the range of 160? to 180 ?,as estimated by Scanning Electron Microscopic (SEM) and X-ray diffraction studies. The photocatalytic activity of this powder in the mineralization of Indanthrene Red LGG is evaluated. The maximum photocatalytic activity is observed in the system, in which the photocatalyst is used in the presence of an oxidizing agent. The effect of inorganic oxidizing species to act as an electron scavenger, thus, influencing the rate of photocatalytic degradation, is studied. Extent of degradation is followed by UV-visible and IR spectroscopy. Based on the results, a kinetic model for the degradation is proposed.