The Study On Combined Denitration Performance At Low Temperature By MOFs And Modified TiO₂/GO Composites

Nitrogen oxides（NO_X）,as one of the main pollution sources in the atmosphere,have greatly affected human health.It is particularly important to study materials that remove nitrogen oxides more efficiently.In this experiment,MOFs and TiO₂/GO composites were prepared for the removal of high-concentration nitrogen oxides,and their denitration performance and reaction mechanism were explored.The microwave hydrothermal method was used to prepare the MOFs,which shortens the preparation time and improves the efficiency of the pharmaceutical.The catalyst was subjected to denitration simulation experiments,and the MIL-101（Fe）had the best performance.The amino modification and the doping of Cu and Co elements were selected to determine the best performance catalyst as the best catalyst.When the reaction temperature is 200℃and the concentration of NOx is about1200mg/m³,the denitration efficiency is as high as 88%,which is nearly 40%higher than MIL-101（Fe）catalyst.Through BET,TGA and other characterizations,it was found that the specific surface area of the modified catalyst increases,the selective adsorption capacity for NO is enhanced,and it has relatively stable thermal stability.Hydrothermal method was used to prepare TiO₂/GO.The photocatalytic experiments were conducted to investigate the GO composite content and the reaction conditions.The TiO₂/（60mg）GO catalyst hydrothermally treated at 180℃for 8 hours had the best efficiency which is as high as 87%.And its removal efficiency of nitrogen oxides below 15mg/m³ is more than 90%,which is 40%higher than the pure TiO₂.XPS,TEM,UV-Vis and other characterizations show that the response of the composite catalyst to visible light is improved,so it can generate more the photo-generated electrons can more rapidly oxidize NO,reduce NO₂,and enhance the photocatalytic ability of nitrogen oxides.Combining the simulated SCR denitration part with the photocatalytic denitration part to enhance the removal ability of high concentration nitrogen oxides,the removal efficiency of NO_x is increased by 40%,and the combined application has a wider range of applications.Better removal of NO_x,with higher economic benefits.