Mineralization of hazardous chemicals by heme reaction

摘要

The catalytic degradation of pentachlorophenol contaminated soil by heme and hydeogen peroxide has been reported. Here we studied evidence for the mechanism and mineralization by the herme catalyzed reaction for hazardous organopollutants. Ferryl heme radical and non-radical ferryl heme were generated rapidly by the interaction of heme and hydrogen peroxide (H_2O_2). The activated heme radical could initiate the oxidaton of 5-aminosalicylic acid (5-ASA). The reactions by heme with H_2O_2 could support the redox cycling between the ferryl species of heme and 5-ASA as the mechanistic routes of the heme catalyzed reaction. Hazardous compounds such as pentachlorophenol, phenanthrene and banzo(a)pyrene were mineralized 20, 6, and 7percent, respectively, with 30 mM heme and 1500 mM H_2O_2, after 24 hr reaction. This catalyzed degradation of organopollutants could be used as a novel technology for hazardous waste remediation.