Heterogeneous activation of H₂O₂/Na₂S₂O₈with iron ore from water distribution networks for pollutant removal

In this study, we investigated using the main composition of pipe deposits from water distribution networks as catalyst to activate dual-oxidant H₂O₂/Na₂S₂O₈system to produce radicals for perchloroethylene and chloramphenicol removal. According to the results, the degradation efficiency of perchloroethylene by H₂O₂/Na₂S₂O₈system was 92.05% within 8 h. Due to the slow conversion between Fe3 and Fe2 , the hydroxylamine was introduced to reduce reaction time. As for the results, the degradation efficiency of chloramphenicol in the H₂O₂/Na₂S₂O₈system with hydroxylamine assistance was 73.31% within 100 min. Meanwhile, several key affecting factors and the kinetic models were investigated. The primary radicals were identified by electron paramagnetic resonance and radical scavenging tests. Eleven degradation products were confirmed by high-resolution liquid chromatography-mass spectrometry. The result of this study provided the theoretical basis for resource utilization of pipe deposits in water treatment in case of emerging contamination events.