ISOTEC’s modified Fenton’s reagent (MFR) is based on the fundamental principles of Fenton’s chemistry. Henry J.H. Fenton was a British chemist who first demonstrated the use of Fenton’s chemistry in 1894, through the oxidation of tartaric acid using a soluble iron-catalyzed decomposition of dilute hydrogen peroxide under acidic conditions. Our MFR process was developed with the fundamental goal of enhancing in-situ treatment of soil and groundwater contamination using Fenton’s chemistry while mitigating the drawbacks associated with application of Fenton’s reagent in its conventional form (such as acidic pH, limited catalyst mobility, etc). The process generates powerful free radicals when the catalyst reacts with hydrogen peroxide. The principal chemical reaction associated with the modified Fenton’s process is provided below:
In addition to the initial reaction that produces hydroxyl radical oxidants, the modified Fenton’s process also produces superoxide radical and hydroperoxide anion reductants through additional chain propagation reactions. The perhydroxyl radical is known to be a weaker reductant compared to superoxide radical and hydroperoxide anions.
The co-existing oxidation-reduction reactions associated with a modified Fenton’s process promote enhanced desorption and degradation of recalcitrant compounds. These include compounds such as carbon tetrachloride and chloroform, which were previously considered untreatable by Fenton’s chemistry.
COMPARISON WITH OTHER PEROXIDE-BASED TECHNOLOGIES
|Technology Features||Hydrogen Peroxide||Classic Fenton’s Reagent||Modified Fenton’s Reagent|
|Hydroxyl Radical Production||Limited||Yes, if pH < 3||Yes|
|Superoxide Radical Production||No||Limited||Yes|