Photocatalytic Oxidation of Reactive Red 22 in Aqueous Solution Using La₂Ti₂O₇ Photocatalyst

This study was focused on the application of a highly doped layered perovskite, La₂Ti₂O₇, as the photocatalyst for the photocatalytic decomposition of an azo dye, Reactive Red 22 (RR22). The temporal behavior of the photocatalytic decomposition of RR22 in aqueous solution by the UV/La₂Ti₂O₇ with a batch photoreactor operated in a recirculation mode was studied under various operating conditions including solution pH, light intensity, and La₂Ti₂O₇ loading. The decomposition of RR22 in aqueous solution by La₂Ti₂O₇ photocatalytic process was found to be feasible. An empirical kinetic equation was developed for modeling the photocatalytic decomposition of RR22 in aqueous solution using UV/La₂Ti₂O₇ photocatalytic processes.