Preparation Of Fe-Co Prussian Blue Analogue Nanofibers And Their Performance And Mechanism Of Degradation Of Bisphenol A By Catalyzing Peroxymonosulfate

Sulfate radical-based advanced oxidation processes（SR-AOPs）have been widely used in the efficient removal of organic pollutants in water in recent years due to their strong oxidation performance and high selectivity.Of all the methods for generating sulfate radicals,the activation of persulfate（PS）or peroxymonosulfate（PMS）using nanomaterials is a very effective way.Metal-organic frameworks（MOFs）have the advantages of high stability,large porosity,and high specific surface area.They have attracted wide attention in the field of SR-AOPs.However,MOFs-based nanomaterials usually face problems such as easy agglomeration and difficulty in recycling due to their inherent powder properties.Based on the above consideration,this paper proposed the research of preparing Fe-Co Prussian blue analogue nanofibers and studing their performance and mechanism of degradation of bisphenol A（BPA）by catalyzing peroxymonosulfate.The main research contents and conclusions are as follows:（1）The spiderweb-like Fe-Co Prussian blue analogue/polyacrylonitrile（FCPBA/PAN）nanofibers were prepared in order to increase the load of MOFs:First,a kind of bimetal MOF,Fe Co Prussian blue analogue was prepared.Then,FCPBA and PAN were blended to prepare spiderweb-like FCPBA/PAN nanofibers by electrospinning.The degradation of BPA by activating PMS showed that FCPBA/PAN has good catalytic activity.The mechanism of BPA degradation was investigated through inhibitor and electron paramagnetic（EPR）experiments.The results showed that it was a free radical mechanism,and two free radicals,hydroxyl radical（^·OH）and sulfate radical(SO₄^·–)contained in the reaction system,SO₄^·–dominated the activation of PMS.In addition,FCPBA/PAN has good free-standing property,flexibility and processability,which solves the problem of easy agglomeration and poor reusability,and has good practical application prospects.（2）To improve the activity and stability of MOFs-based nanofibers,FC@CNF-800carbonaceous nanofibers with York-Shell structure were perpared through high-temperature pyrolysis:FCPBA was mixed with PAN and then electrospun into nanofibers and further carbonized under 800℃to prepare FC@CNF-800 carbonaceous nanofibers with York-Shell structure.During the carbonization process,FCPBA generates a unique York-Shell structure due to the confined effect of the PAN layer.The carbonaceous nanofibers have excellent activity and stability,and have very good removal effect on BPA（100%of BPA was removed within10 min）.The study of degradation mechanism shows that the free radical mechanism is dominated by SO₄^·–.In this work,via preparing FCPBA nanofibers,the problems of easy agglomeration and poor reusability of MOFs are effectively solved,and makes it possible to apply MOFs materials in practical application and provides new ideas for the practical application of MOFs.