NICKEL NANOPARTICLES CATALYST FOR EFFECTIVE DEGRADATION OF CARMOISINE A IN AQUEOUS ALKALINE MEDIUM BY USING HEXACYANOFERRATE (III) IONS AS A REDUCTANT: A KINETIC STUDYSHIVANI* AND ANJALI GOELAbstract The degradation of Carmoisine A, a mono azo dye, by Hexacyanoferrate (III) ions in the aqueous alkaline medium using nickel nanoparticles as catalyst has been investigated by kinetic â spectrophotometric method at (Lambda ) max 515 nm of the reaction mixture. The effect of different parameters like concentration of dye, concentration of oxidant, and pH of the solution on the rate of reaction have been studied under the same experimental conditions. The results show that the degradation rate of the dye increases linearly with the increase in concentrations of oxidant and dye at optimum pH of 7.5 and constant temperature of 40 ± 0.1 °C. Thermodynamic parameters such as energy of activation (Ea), enthalpy of activation (Angle H#), entropy of activation (Angle S#), frequency Factor (A) and free energy of activation (Angle F#) have been calculated by studying the reaction rate at four different temperatures, i.e. 40â55 °C. UV-Vis, HPLC and LC-MS methods of analysis of degradation products reveals that degraded products are simple and less hazardous. |