Peroxide Decoloration of Azo Dyes Catalyzed by Manganese Chlorophyll Derivative in Micellar Solutions

A manganese chlorophyll derivative (MnChlorophyll a) with hydrogen peroxide efficiently catalyzed the decoloration of C. I. Acid Orange 7, in various micellar solutions under mild conditions such as pH 6-8 and 25 degrees C. In the experiment, peroxide decoloration was dependent on the structures of the surfactants and the presence of imidazole. The maximum decoloration rate was observed for MnChlorophyll a in hexadecyltrimethylammonium chloride (HDTAC) micellar solution, especially in the presence of imidazole.