Removal Of Elemental Mercury From Flue Gas Of Coal-Fired Power Plant By Halloysite Loaded With Iron-Based Perovskite

Mercury（Hg⁰）has been troubled by its volatile,migratory and bioaggregative properties.Mercury emission sources are mainly divided into natural emission sources and anthropogenic emission sources.Among the numerous anthropogenic emission sources,the combustion of coal in traditional coal-fired power plants is considered as one of the most important anthropogenic emission sources.At present,the control of mercury in coal-fired power plants mainly adopts adsorption method and advanced oxidation method.The main adsorption method is activated carbon injection technology（ACI）,but this method has high cost,easy to cause secondary pollution is difficult to large-scale application.Advanced oxidation method uses free radicals with strong oxidation ability to oxidize Hg⁰ to Hg²⁺for removal.H₂O₂,as a cheap green oxidant,is suitable for the removal of Hg⁰.However,the current advanced oxidation system of UV/H₂O₂ is not high in the removal efficiency of Hg⁰in flue gas.Therefore,the development of a heterogeneous catalyst to enhance H₂O₂removal ability of Hg⁰ is of great significance.In this paper,a series of perovskite-supported HNTs composites were synthesized by sol-gel method,and their catalytic performance was tested by fluorescence mercury analyzer.A series of characterization methods such as XRD,XPS,SEM,PL,VSM,etc.were used to analyze the structure and properties of the materials.The microstructure of the material was observed by SEM.Optical properties of materials analyzed by PL;The magnetic properties of the material at room temperature were studied by VSM.The possible removal mechanism of Hg⁰ was analyzed by XPS and ESR.The results show that the removal efficiency of Hg⁰ can reach about 97%under simulated flue gas conditions,which significantly improves the removal ability of Fenton system for Hg⁰,and has positive significance for the removal of elemental mercury in flue gas.