Nano Archive

Photocatalytic degradation of Azure and Sudan dyes using nano TiO2

Aarthi, T and Narahari, Prashanthi and Madras, Giridhar (2007) Photocatalytic degradation of Azure and Sudan dyes using nano TiO2. JOURNAL OF HAZARDOUS MATERIALS, 149 (3). pp. 725-734. ISSN 0304-3894

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Abstract

The present study investigates the dependence of photocatalytic rate on molecular structure of the substrate that is degraded. The photocatalytic degradation of Azure (A and B) and Sudan (III and IV) dyes, having similar structure, but different functional groups, were investigated with two catalysts. The photocatalytic activity of solution combustion synthesized TiO2 (CS TiO2) was compared with that of Degussa P-25 for degrading these dyes. The effect of solvents and mixed-solvent system on photodegradation of Sudan III was investigated. The photodegradation rate was found to be higher in solvents with higher polarity. The effect of pH and the presence of metal ions in the form of chloride and nitrate salt, on degradation rate of Azure A was also investigated. The metal ions significantly reduced the photocatalysis rates. A detailed Langmuir–Hinshelwood kinetic model has been developed to explain the effect of metal ions on degradation rate of the substrate. This model elucidates the contribution of holes and electrons towards degradation of the dye.

Item Type:Article
Subjects:Material Science > Functional and hybrid materials
Physical Science > Nanophysics
Analytical Science > Nanotechnology for sensing and actuating
Physical Science > Nano objects
Material Science > Nanochemistry
Physical Science > Photonics
Divisions:Faculty of Engineering, Science and Mathematics > School of Physics
Faculty of Engineering, Science and Mathematics > School of Chemistry
ID Code:3907
Deposited By:JNCASR
Deposited On:28 Jan 2009 06:57
Last Modified:12 Feb 2009 11:50

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