MEASURING FENTON'S REACTION KINETICS AT ONE-SECOND INTERVALS

Abstract

The concept of quench flow has been implemented to design a simple and yet easy-to-operate device to measure Fenton's reaction kinetics at one-second intervals. 2,4-dinitrophenol (DNP) was used as a model compound in this study. Experimental results show that more than 40% of DNP can be decomposed within the first second, followed by a stagnant reaction for a period of 29 seconds. Subsequently, a 5% drop in the ADMI (American Dye Manufacturing Index) color value was observed. The initial specific rates of DNP concentration and the ADMI color value were the same, indicating that ADMI color value can be potentially used as a process parameter in designing a computerized Fenton's oxidation process. The scanning spectrum recorded a reaction pattern with constant rates of decolorization and degradation of DNP occurring between 5 and 29 seconds, irrespective of different Fe²⁺/H₂O₂ ratios. Such a reaction pattern has not been reported elsewhere.

Keywords:

• Fenton's reaction kinetics
• 2,4-Dinitrophenol
• ADMI color value
• Degradation
• Decolorization
• Initial specific rate

Acknowledgments