Preparation Of MOFs Composites And Their Catalytic Ozone Decomposition Properties

In our daily life,we are often unconsciously exposed to ozone,such as when using printers or visiting a doctor in a hospital.In fact,prolonged exposure to ozone can have a greater impact on human health.Given this,to develop excellent ozone decomposition catalysts is especially urgent.MOFs materials are porous materials with large specific surface area,high porosity as well as diverse three-dimensional structure,which exhibit strong potential and application prospects in the field of catalysis.Whether as catalysts themselves or as carriers for other catalysts,MOFs materials can present excellent performance.In this thesis,a series of MOFs materials were prepared by ordinary solution method and hydrothermal synthesis method.Meanwhile,various types of composites were produced by piggybacking MnO₂with MOFs materials as carriers,and the catalytic performance of such composites was proved to be superior to that of MOFs materials alone.Through characterization and analysis of the related properties of the composites,it was found that the addition of MnO₂ did not change the structure of MOFs materials,and MnO₂ obtained higher specific surface area and ozone catalytic decomposition performance.The optimal preparation methods of two kinds of composites with higher catalytic decomposition performance were optimized and improved by comparing their catalytic decomposition ozone performance.Subsequently,through the performance test of the optimum prepared composites under different working conditions,it was confirmed that the ambient temperature imposed the greatest influence on the catalyst performance.Finally,based on a series of characterization results,the improved materials could achieve better catalytic ozone decomposition performance due to the advantages of higher crystallinity,larger specific surface area,lower valence of Mn species on the surface,and a higher number of oxygen vacancies.This study makes a new attempt for catalytic ozone decomposition,with good catalytic decomposition effect realized,which not only is beneficial to enrich related research,but also certain practical significance.