OXIDATION OF SULFAMERAZINE WITH Fe2+/PERSULFATE SYSTEM: EFFECTS OF INORGANIC ANIONS AND DEGRADATION MECHANISM BASED ON INDEPENDENT REACTION

摘要

The heavy use of sulfonamide antibiotics leads to significant detection in water, and the existence of “fake persistence” seriously affects the ecological health. In this work, the Fe2+/ persulfate (PS) catalytic oxidation approach was used to remove sulfamerazine (SM1). Results showed that SM1 could be effectively removed in the Fe2+/PS system and the removal rate of over 90% was achieved. The pH value in Fe2+/PS system would rapidly decrease to 3 with the beginning of reaction in the initial pH range of 3.0-9.0. The inorganic anions HCO% and NO? in water had significant inhibitory effect on the SMI degradation process, while NO? had obvious promotion effect. The free radical validation results suggested that both 50% and HO played important roles in the oxidation process. Based on the chemical stoichiometric matrix method, the independent reaction formulas for the SM1 degradation process were developed and a possible degradation path of SM1 was also proposed. In addition, both the theoretical calculation and experimental results indicated that the degradation process of SM1 was consistent with the first-order kinetics.