Authors : N. P. Mohabansi* , S. A. Mandavgane a, M. K. N. Yenkieb, N. A. Barwatc
Page Nos : 882-891
Description :
Photo catalytic oxidation is a potential method for the treatment of organic contaminants and has received significant interest and research with tremendous potential in the near future. A model compound, p-amino benzoic acid was degraded by using hydrogen peroxide, photocatalyst (TiO2) in presence of UV lamp. The experiments were carried out in a batch photo reactor using 8W low pressure mercury vapour lamp in lab-scale experiments. Substrate concentration was determined by UV-Visible spectrophotometer. Different [H2O2/p-ABA] molar ratios, photocatalyst doses and pH (plain water, 3, 5, 6, 7 and 9) were optimized in order to establish the most favorable experimental conditions for the photo catalytic process. The optimum [H2O2/p-ABA] molar ratio and pH were found to be 5 and 7 respectively. The rate of degradation was studied by varying the amount of catalyst doses from 10 to 90 mg. By applying the optimal experimental conditions, it was observed that 240 min irradiation of the wastewater in 50mg/l Degussa P25 with UV/H2O2/TiO2 system was sufficient in order to degrade the organic substrate in the investigated wastewater. The studied photo catalytic processes were found to adhere to pseudo first-order kinetics with respect to the substrate concentration. Key words:- Degradation, Photocatalyst, p- Amino benzoic acid, Photo reactor, Pseudo first- order kinetics.
