Table of Contents
Journal of Nanoscience
Volume 2014 (2014), Article ID 481023, 8 pages
http://dx.doi.org/10.1155/2014/481023
Research Article

Degradation of Tannic Acid Using TiO2 Nanotubes as Electrocatalyst

National Metallurgical Laboratory, Madras Centre, CSIR Madras Complex, Taramani, Chennai 600113, India

Received 12 August 2013; Revised 1 November 2013; Accepted 1 December 2013; Published 5 January 2014

Academic Editor: Patrick S. M. Dunlop

Copyright © 2014 N. Lakshmi Kruthika et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

Structured TiO2 nanotubes were grown on 2 mm thick titanium sheet by anodization of titanium in ethylene glycol medium containing 0.025 M NaF. The morphology of TiO2 nanotubes (TNT) was characterized using field emission scanning electron microscope. The potential of TNT as anode and also as photocatalyst for the degradation of tannic acid was studied. The mineralization of tannic acid was measured in terms Total Organic Carbon (TOC). Only 50% of TOC could be removed by exposing the tannic acid solution to UV-radiation (photolysis), whereas it was improved to 70% by electrooxidation (EO) using TNT as anode. Maximum degradation of 83% was achieved when electrooxidation was conducted under the influence of UV-radiation (photoelectrocatalytic process (PEC)). Among the electrolytes tried, Na2SO4 was observed to be very effective for the degradation of tannic acid. The kinetics of tannic acid degradation by photoelectrocatalytic process was found to follow zero-order rate expression.