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  • Title: Lactate oxidation in pyrite suspension: a Fenton-like process in situ generating H2O2.
    Author: Wang W, Qu Y, Yang B, Liu X, Su W.
    Journal: Chemosphere; 2012 Jan; 86(4):376-82. PubMed ID: 22099540.
    Abstract:
    Pyrite is a common mineral at many mining sites. In this study, the mineral pyrite was studied as a Fenton-like reagent for environmental concerns. We selected lactate as a model target molecule to evaluate the Fenton-like catalytic efficiency of pyrite upon organic oxidation. A complete set of control experiments in both aerobic and anaerobic atmospheres unequivocally established that the pyrite in aqueous solution could spontaneously in situ generate (·)OH and H(2)O(2), serving as a Fenton-like reagent to catalyze the oxidation of lactate to pyruvate with no need for additional H(2)O(2). We called it the pyrite-only Fenton-like (PF) reagent. Monitoring concentration changes of lactate and pyruvate with the time indicated that the pyrite mediated the favorable pyruvate formation at pH 4.5, 60 °C, under air atmosphere. The PF reaction could be stimulated by visible light illumination. Under the optimum conditions, up to 50% of lactate was degraded within 10d. The results suggest that pyrite and its Fenton-like processes may be potentially practical in wastewater treatment.
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