(514b) Bi-Functionalized Ionic Liquid/MOF Composite Material for Efficient Carbon Dioxide Capture and Conversion
To alleviate environment issues derived from CO2 emission, it is significant to develop an economical and effective means of CO2 capture and conversion. Ionic liquids (ILs) possess remarkable properties such as low volatility, excellent thermal stability and widely tunable structure, which have been used as CO2 absorbents and conversion catalysts. However, most of ionic liquids have the characteristic of high viscosity, which limits the mass transfer of guest molecules. Metal-organic framworks (MOFs) have recently attracted significant attention because of their large surface area, high porosity and inherent functionality. Therefore, combination of ILs and MOFs is a meaningful strategy to enhance capture ability and catalytic performance.
In this study, bi-functionalized ionic liquid immobilized on MOF material was developed for CO2 capture and conversion. First, bi-functionalized ionic liquid 1-(2-carboxyl-ethyl)-3-methoxyethyl-imidazolium chloride ([CeMOEim][Cl]) and metal-organic framework MIL-53(Al) were respectively synthesized. Furthermore, [CeMOEim][Cl] was immobilized on as-synthesized MIL-53(Al) via ultrasonic-assisted impregnation method. Chemical structure, microstructure, and thermal stability of as-synthesized materials were characterized by NMR, FT-IR, XRD, SEM, TEM, N2 adsorption-desorption measurement and TG analysis. Finally, [CeMOEim]/MIL-53(Al) composite materials with different loading rates were used as CO2 sorbent and catalyst. For comparision, capture capacity and catalytic performance of the functionalized ionic liquid and MIL-53(Al) were also studied.