Preparation Of Carbon Nanofiber Supported Iron Catalysts And Their Degradation Performance Of Bisphenol A In Water

The rational design of active,sustainable and eco-friendly heterogeneous catalysts towards advanced oxidation process（AOPs）is of great significance for water remediation.At present,transition metal oxides such as Co₃O₄and Mn₂O₃ are widely used in the process of activating PMS to remove micropollutants in water.However,leaching of heavy metal ions will cause secondary pollution of the water environment.What’s more,nanoparticles are easy to aggregate and difficult to separate from water,severely limiting their applications in practical projects.Aiming at this problem,the preparation of carbon nanofiber supported iron heterogeneous catalysts was investigated in this paper.The removal performance and mechanism of water micropollutants represented by bisphenol A（BPA）were studied.By using the method of pyrolysis self-reduction after impregnation and electrospining technology,we successfully synthesized carbon nanofiber supported iron（Fe-TC）and nitrogen-doped carbon nanofiber supported iron（Fe NC）two kinds of composite catalysts,respectively.And the characterization of synthetic materials was done,proving that the iron particles were successfully embeded onto the carbon matrix with uniform particle sizes and good dispersion.At the same time,the graphitization degree of carbon materials was dramatically improved during carbonization processes.In BPA degradation experiments,both catalysts showed excellent catalytic activity:（1）Fe-TC-900/PMS system could completely remove 20ppm of BPA within 30mins;（2）Fe NC-9/PMS system could completely remove 20ppm of BPA within6 minutes.Both catalysts have good adaptability to p H,favourable recycling performance and separation property.The influence of different reaction conditions on catalytic efficiency was also studied.The mechanism of the reaction was explored based on inhibitor experiments and EPR test results:the composition of the active species during BPA oxidation process,demonstrating the dominant role of sulfate radical(SO₄^·–)and hydroxyl radical（^·OH）.This paper provides ideas for the preparation of new efficient,stable and environmental friendly iron/carbon composite catalysts,which successfully solves the problems of loss and reuse of nanomaterials in water treatment process.It expands the application prospects in the field of water environment restoration using advanced oxidation processes.