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Kinetic and Mechanism Study of the Oxidative Decolorization of Neutral Red by Bromate in Micellar Medium

M. Nasiruddin Khan^a,*, Z. Siddiqui^b and F. Uddin^c

 ^a,b,cDepartment of Chemistry, University of Karachi, Karachi-75270, Pakistan

The kinetics of the oxidation of neutral red by bromate was investigated in the presence of cationic surfactant (N-dodecylpyridinium chloride) and strongly acidic media over the temperature range 22-35 °C.  The kinetic studies were carried out as a function of different variables like concentration and temperature. The described reaction rate is greatly catalyzed by the presence of trace amount of Fe(II)  ions and followed by pseudo-third-order kinetics with respect to dye concentration. A possible mechanism for the catalyzed reaction is offered which is found to be coincidentally congruent with experimental findings. The derived rate equation is in good agreement with the experimental observations. Thermodynamic parameters were also evaluated.

Keywords: Kinetic, Bromate, Neutral red, Surfactant, Mechanism