Fe-based As Fenton-like Catalysts For Catalytic Degradation Of Organic Pollutants

Advanced oxidation technology based on persulfate has been widely used in the catalytic degradation of persistent organic pollutants in Orange II due to its high economic efficiency,green environmental and high catalytic efficiency.In order to solve the technical problem,this paper uses simple preparation method synthesizing iron-base materials embedded in stainless steel mesh?Fe@NESS?and nano-Fe⁰embedded in N-doped carbon architectures?Fe⁰@N-C?.The catalytic degradation of organic pollutants by composite materials was studied,the reactive reactive oxygen species and catalytic mechanism were investigated.And the main research contents are as follows.The iron-based material embedded in stainless steel mesh?Fe@NESS?prepared by simple two-step method were used as peroxymonosulfate?PMS?activator for the mineralization of organic pollutants.SEM and XPS analysis showed that excellent electron conductivity and the favorable morphology with coexisting Fe,Ni,and Cr species in Fe@NESS makes an effective electron transfer between catalyst and PMS.The as-prepared Fe@NESS itself can induce the PMS activation,and the oxygen vacancies can enhance the chemical bonding with PMS,providing active sites for PMS activation.As a result,The removal rate of orange II in Fe@NESS/PMS system was up to 100%within 40 min.Electron paramagnetic resonance and the quenching experiments demonstratedSO₄^?-,HO^?,O₂^?-and ¹O₂ as the dominant reactive species were responsible for the oxidation removal of refractory contaminants.Fe@NESS could be easily recycled without filtration,and has the advantages of the stability and reusability.Therefore,Fe@NESS is an effective and low-cost catalysts for environmental applications.Nano-Fe⁰ embedded in N-doped carbon architectures?Fe⁰@N-C?were used as peroxymonosulfate?PMS?activator for the mineralization of organic pollutants in the water.The influences of some representative factors for the PMS activation were comprehensively analyzed and optimized.Fe⁰@N-C exhibited the unexpected oxidized ability and excellent reusability for the oxidation treatment of organic pollutants,better than that of most conventional metal catalysts.Further,The enhanced performance of Fe⁰@N-C was primarily ascribed to abundant reactive oxygen species,especially ¹O₂,through both radical and nonradical pathways.It was found that nano-Fe⁰ particles wrapped with N-doped graphitic layers could preferentially generate effective Fe⁰ and Fe-Nx active sites with the electric structure reconstruction,endowing the outstanding catalytic activity.The unique porous carbon structure not only protected the embedded nano-Fe⁰ from poisoning or leaching in acid media,but also effectively provided suitable mass transfer channels for reactant to the nano-Fe⁰ iron core and also efficiently promoted electron tunneling efficiency.These outstanding characteristics manifested the high-efficiency Fe⁰@N-C material had promising potential for the degradation of organic pollutants.