Preparation of [BMIM]HSO₄@SiO₂ Ionic Liquid Microcapsules and Application to CO₂ Adsorption

Abstract

Carbon emissions are closely related to global climate change and have gradually become a focus of attention. Carbon capture is an effective way to reduce carbon emissions, ionic liquid microcapsules (ILM) have great potential as a CO2 capture material. [BMIM]HSO4@SiO2 ionic liquid microcapsules were prepared by in situ polymerization, and the microcapsule samples were characterized using thermo-gravimetric analysis & differential scanning calorimetry (TG/DSC), scanning electron microscopy (SEM), laser particle size analysis and surface area analyser. The microcapsules on the CO2 adsorption properties were investigated. The results showed that the microcapsule particles have a smooth spherical morphology and uniform size, the average particle size was 146 μm. The TG/DSC showed the microcapsules have better thermal stability. From 273 K isothermal adsorption curve of microcapsules, the sample can reach the maximum adsorption capacity of 4.87 cm3/g STP (standard pressure).