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2 Polish Journal of Chemistry

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Enhanced Activity of Nano-TiO2 in Photoelectrocatalysis over Photocatalysis Process for the Degradation of Indanthrene BR Violet Dye in Presence of UV-Light

Gomathi Devi L., Kottam N.

Polish Journal of Chemistry

2007

Vol. 81, nr 10

1819-1819

This paper reports results of an investigation of the removal of Indanthrene BR Violet (IBRV) dye in a photoelectrochemical oxidation reactor with semiconductor suspended in the aqueous solution. TiO2 nano powder is prepared by sol-gel method to improve catalytic efficiency. X-ray diffraction analysis indicated anatase crystalline form with particle size of 17.9 nm. Diffuse reflectance spectra showed that the band gap is 3.0 eV. The model compound chosen for the degradation study is Indanthrene BR Violet dye. The presence of a catalyst in the electric field can enhance the treatment efficiency. The reaction was studied at different applied potentials +2.0 V, +1.0 V, +0.1 V, +0.05 V, + 0.01 V. The study has shown that an optimum voltage is necessary for a particular degradation reaction. Finally these results are compared with the photocatalytic degradation.

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.