Abstract
Fe-N-C materials have received increasing attention,due to its distinctive catalytic activity.However,the Fe-N coordination number dependence of catalytic ability and mechanism for H2O2 activation remain elusive.Herein,a series of Fe-N-C heterogeneous Fenton-like catalysts with different Fe-N coordination number were prepared for tetracycline degradation.The results demonstrated that samples with Fe-N4 structure exhibited high activity.The excellent performance was mainly ascribed to the high adsorption capacity and the formation of superoxide radicals(·O2-)catalyzed by Fe linked to pyridinic nitrogen.The intermediates and degradation pathways of tetracycline degradation by Fe-N-C/H2O2 system were analyzed by liquid chromatography coupled to tandem mass spectrometry(LC-MS/MS).Furthermore,we applied our Fe-N-C catalysts to treat simulated pharmaceutical wastewater with high tetracycline degra-dation capacity despite high concentrations of organic matter such as oxalic acid and various ionic inter-ferences.Our work reveals the dependence of the activation H2O2 on the Fe-N coordination environment and the degradation mechanism of these catalysts.It provides insights into the prospects for tuning the catalyst in practical applications.
维普
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