Measuring Fenton's reaction kinetics at one-second intervals

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 stu dy. Experimental results show that more than 40% of DNP can be decomposed w ithin the first second, followed by a stagnant reaction for a period of 29 seconds. Subsequently, a 5% drop in the ADMI (American Dye Manufacturing In dex) color value was observed. The initial specific rates of DNP concentrat ion and the ADMI color value were the same, indicating that ADMI color valu e can be potentially used as a process parameter in designing a computerize d Fenton's oxidation process. The scanning spectrum recorded a reaction pat tern 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.