Fabrication Of Manganese-based Composite Materials For Catalytic Decomposition Of Gaseous Pollutants

With the development of our country's economy,air pollution has gradually affected the surrounding ecological environment and people's health,It is of great significance to develop elimination technologies and materials for gaseous pollutants.Manganese dioxide shows great application prospects in the catalytic decomposition of gaseous pollutants due to its abundant content in nature,low price,low toxicity,rich valence states,and its unique structure.Coupling manganese-based materials with different carriers is an important way to further enhance their catalytic effect.In this paper,porous structures of Aluminum?Al?mesh and C₃N₄ were used as carriers and were used for the catalytic decomposition of ozone and formaldehyde.The main results are as follows:?1?Preparation of Mn-Co-Anodic Aluminum oxide?AAO?/Aluminum?Al?mesh catalysts for ozone decomposition on Al Mesh by anodic oxidation and impregnation.It has been found that the preparation of AAO on Al mesh requires edge-sealing treatment to obtain better electron conduction performance,thereby ensuring that the anodization process occurs uniformly throughout the Al mesh.AAO's aperture can be controlled by adjusting the voltage and temperature during anodization.The manganese-cobalt composite catalyst was supported by impregnation deposition method.The order of activity was Mn-Co-AAO/Al-mesh>Mn-Co-Al2O3/Al-mesh>AAO/Al-mesh>Al2O3/Al-mesh>None.?2?A MnO_x-Pt catalyst based on the C₃N₄ carrier was designed and prepared to catalytically degrade formaldehyde?HCHO?.Develop photochemical methods with outstanding advantages such as green,simple and controllable.The results show that Pt and Mn species can be uniformly distributed on C₃N₄.However,the composite supported Mn species is Mn₃O₄,The separately supported Mn species is MnO₂ with a salicylmannite structure;XPS results indicate that electrons may be transferred from C₃N₄ to Pt but not efficiently transferred to MnO₂.The electrons transferred to Pt more easily allow the Mn species to form lower valence states during photodeposition,this has led to the emergence of Mn₃O₄.The catalytic degradation of HCHO showed that the material had the best performance of HCHO catalytic decomposition when the loadings of Pt and MnO_x were 1.0wt%and 3.0 wt%.HCHO can be converted to more than 95%at room temperature with very high stability due to it's synergistic effect between Pt and MnO_x.In short,based on the manganese-based materials,this paper develops new carriers and preparation methods obtains two more efficient manganese-based composites that exhibit good activity in the decomposition of ozone and catalytic oxidation of HCHO.The synergistic effect between the different components of the carrier and the catalyst,the above ideas and results have a reference value for the design and preparation of high-efficiency manganese-based catalytic materials.