Metal Organic Skeleton Materials For Carbon Capture Mil - 101 Preparation Research

The excess emission of the greenhouse gas CO2has led to a series of social and environmental issues. How to effectively control and reduce carbon emissions have become one of the most important issues. In order to improve the CO2adsorption capacity of adsorbents at room temperature and atmospheric pressure, in this paper, a kind of metal organic framework MIL-101, with high surface area, high porous volume and good adsorption storage performance, was researched on its synthesis, modification, and CO2adsorption properties.Firstly, MIL-101was synthesized by using a high temperature-hydrothermal method. The effects of synthesis condition on its properties, including surface area and porous volume, were investigated. The results showed that synthesis temperature, pH, purification and activation methods have a great effect on its properties.The submicro and the octahedral structure MIL-101with which particle size of0.8-1um, BET surface area of3029.72m2/g, porous volume of1.42cm3/g and thermo stability of250℃, was obtained by using a purification and activation method of "DMF+CHCl3"at synthesis temperature of210℃, and pH of3.0.Secondly, MIL-101was modified through doping copper and nickel elements and amine modification with triethylenetetramine (TETA). The effects of doping amount and adding amino quantity on the properties of the materials were investigated. The modified MIL-101dopped with20%, nickel30%and TETA0.4ml showed the best performance.The volumetric and gravimetric methods were employed to test CO2adsorption performance of MIL-101. The results showed that the CO2adsorption capacity of MIL-101can be accurately measured by both of the two methods at room temperature and atmospheric pressure. Compare to the volumetric method, gravimetric method was more simple, efficient and much easier automatic detection.Finally, the CO2adsorption capacity and recycle adsorption stability of MIL-101and modified MIL-101were investigated at room temperature and atmospheric pressure. The CO2adsorption capacity of MIL-101was6.37%before modification and decreases to5.27%after6cycle runs of adsorption. As to the MIL-101doped with Cu20%, the CO2adsorption performance was reached to8.10%and decreased to6.97%after6cycle runs of adsorption. After and before dopped with Ni30%, the CO2adsorption performance of MIL-101was improved by30.9%and reached to8.34%. Similar results also showed by MIL-101-TETA-0.4modified by amino, the CO2adsorption capacity was as high as10.12% and still can reach to9.45%after6cycle runs of adsorption.