Performance And Mechanism Of Activating Peroxymonosulfate To Degrade Bisphonel A By 2D MOFs-derived Materials

In recent years,sulfate radical(SO₄^·-)-based advanced oxidation processes（SR-AOPs）have been widely used for the efficient degradation of endocrine disruptors,antibiotics,and other organic pollutants in water due to its advantages of broader adaptive p H range,higher oxidation activity,and selectivity.Metal-organic frameworks（MOFs）derived materials have attracted great attention in SR-AOPs for the easy control of its structure,composition,and targeted design for the reaction requirements.Compared with 0D and 1D structures,2D MOFs and their derivatives,with a larger lateral-to-thickness aspect ratio,possess lower molecular diffusion resistance and more accessible active sites,which can effectively promote reactant diffusion and accelerate catalytic reactions.Hence,the Co/NC nanosheet was obtained by pyrolysis of a typical 2D zeolite imidazole framework（ZIF-L）as the precursor in this paper,and its performance and mechanism of bisphenol A（BPA）degradation by activating peroxymonosulfate（PMS）were studied.The main contents and conclusions are as follows:（1）Preparation and characterization of catalyst:Zn/Co ZIFs-L@PDA with core-shell structure was synthesized by kinetic regulation method,and 2D hollow Co/NC nanosheets（HCNSs-9）were obtained by pyrolysis.The morphology,structure,and composition of HCNSs-9 were characterized,and the formation mechanism of hollow structure was revealed.The results indicate that PDA can effectively avoid the morphology and structure damage of ZIFs-L during pyrolysis,and the confinement effect of PDA can inhibit the agglomeration of Co particles and promote the formation of hollow structure.（2）Performance and mechanism of BPA degradation:The effects of different morphology and pyrolysis temperature on the catalytic performance were investigated.The mechanism of BPA degradation was studied by radical quenching experiment and electron paramagnetic resonance spectroscopy.The degradation pathway of BPA was analyzed in detail by liquid chromatography-mass spectrometry.The results indicate that the catalytic performance of 2D hollow structure is much better than that of 0D structure.The degradation of BPA in HCNSs-9/PMS system is a SO₄^·--dominated oxidation process and the catalys has good reusability and stability.In this paper,catalyst with 2D hollow structure was obtain by pyrolysis of MOFs.The as-prepared catalyst possesses excellent performance and stability on activating PMS to degrade BPA,providing a new idea for the design and preparation of high-performance catalyst for water treatment.