Degradation of Tannic Acid Powered by TiO₂ Nanoparticles

Abstract:

The wastewater from the coir, pharmaceutical, leather, paper and pulp industries is contaminated with water-soluble poly phenolic compounds (tannins). Among various tannins, tannic acid is a typical hydrolysable tannin prevalent in wastewater. The degradation of tannic acid using TiO₂ nanoparticles as photocatalyst was investigated. The effect of catalyst concentration, pH of aqueous suspension and also electron acceptors such as hydrogen peroxide (H₂O₂) and ozone (O₃) on the degradation of tannic acid was studied. The degradation of tannic acid was found to be more efficient and complete in the presence of UV/TiO₂/O₃ compared to UV/TiO₂/H₂O₂. The kinetics of degradation was observed to follow first order rate equation which indicates that the mineralization process is diffusion controlled.

• Periodical: Materials Science Forum (Volume 734)
• Pages: 117-126
• DOI: https://doi.org/10.4028/www.scientific.net/MSF.734.117
• Online since: December 2012
• Authors: N. Lakshmi Kruthika, G. Bhaskar Raju, S. Prabhakar
• Keywords: Advanced Oxidation, Hydrogen Peroxide, Mineralization, Ozone, Photocatalyst, Tannic Acid, TiO₂ Nanoparticle

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