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Journal of agricultural and food chemistry

Fenton degradation of 4,6-dinitro-o-cresol with Fe(2+)-substituted ion-exchange resin.


PMID 19326864

Abstract

The Fenton degradation of 4,6-dinitro-o-cresol (DNOC) was studied under different experimental conditions using Amberlyst 15 ion-exchange resin containing ferrous ion. DNOC was found to be effectively degraded under most conditions, and it was observed that, with the addition of HCl, the desorption of ferrous ion from the resin into the solution played a major role in this degradation. The total iron concentration in the reaction solution was found to increase with the addition of HCl, and a pseudo-first-order kinetic model was applied to the desorption of ferrous ion from the resin on the basis of the assumption of a first-order ion-exchange process. The degradation rate of DNOC also increased as a function of HCl. A kinetic model was developed to simulate the degradation of DNOC under different operating conditions, assuming the first-order desorption of ferrous ion. Different cations were compared with H(+), and H(+) was found to be the most efficient at facilitating the degradation reaction at low concentrations, whereas Ca(2+) was found to be most efficient at high concentrations. pH was measured during the reaction, and its effect on degradation was explored. It was found that a lower pH could lead to faster degradation of the target compound. Degradation of DNOC under different delivery rates of H(2)O(2) was studied, and optimal conditions were determined. The results also showed that the delivery rate of H(2)O(2) did not affect the ion-exchange process of the resin.