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Photodegradation of methylene blue dye using $UV/BaTiO_3$, $UV/H_2O_2$ and $UV/H_2O_2/BaTiO_3$ oxidation processes

Madhu, GM and Raj, MALA and Pai, KVK and Rao, S (2007) Photodegradation of methylene blue dye using $UV/BaTiO_3$, $UV/H_2O_2$ and $UV/H_2O_2/BaTiO_3$ oxidation processes. In: Indian Journal of Chemical Technology, 14 (2). pp. 139-144.

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Abstract

The photocatalytic degradation of methylene blue (MB) in aqueous solution was studied using UV source in presence of synthesized $BaTiO_3$ as photocatalyst and in combination with different concentrations of $H_2O_2$. The experiments were carried at different catalyst loading (0.05 & 0.1 wt %), pH (3, 7 & 9) and $H_2O_2$ dosage (0.5 - 6 mL/L). The degradation rate was found to be strongly dependent upon various experimental parameters such as catalyst loading, pH, and dosage of $H_2O_2$. There was no appreciable degadation seen in presence of catalyst alone. Discoloration of the dye was very nearly complete using $UV/H_2O_2$. Neither UV radiation nor $H_2O_2$ alone was able to decolourize the dye. The best degradation results were observed under optimum conditions of catalyst loading of 0.05 wt%, pH 9 for $BaTiO_3/UV$ system. The optimum dosage of $H_2O_2$ for 12 ppm concentration of the dye was found to be 2 mL/L for $UV/H_2O_2$. The experimental kinetic data on the degradation of the dye followed the pseudo first order rate. Tests were further carried out for degradation of the dye using $BaTiO_3/UV/H_2O_2$ system. An enhancement in the degradation rate was observed with this system compared to $UV/H_2O_2$ system.

Item Type: Journal Article
Additional Information: Copyright of this article belongs to National Institute of Science Communication and Information Resources.
Keywords: Methylene blue;BaTiO3;Photocatalytic;Discolouration
Department/Centre: Division of Mechanical Sciences > Chemical Engineering
Date Deposited: 09 Jul 2007
Last Modified: 24 Jan 2012 10:21
URI: http://eprints.iisc.ernet.in/id/eprint/11456

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