Enhanced CO2 Adsorption and Selectivity of CO2/N2 on Amino-MIL-53(Al) Synthesized by Polar Co-solvents

Abstract

Amino-MIL-53(Al) was solvothermally synthesized using co-solvents, such as methanol (M), ethanol (E), methanol/acetic acid (MA), or ethanol/acetic acid (EA), as modulators with dimethylformamide (D). The effects of co-solvents on physicochemical properties of amino-MIL-53(Al) were investigated. It was found that the addition of co-solvents in the synthesis leads to the reduction of crystallinity and crystal size of the samples. The textural properties, such as specific surface area and porous structure, were manipulated. Amino-MIL-53-DMA exhibited the highest Brunauer–Emmett–Teller surface area of 632 m2/g as a result of the loss of the bridging hydroxyl group, while amino-MIL-53, amino-MIL-53-DE, amino-MIL-53-DEA, and amino-MIL-53-DM presented the surface areas of 400, 356, 321, and 348 m2/g, respectively. However, the primary amine groups were maintained on the surface of all of the amino-MIL-53 samples. The co-solvents enhanced CO2 adsorption on modified amino-MIL-53. CO2 adsorption capacities on amino...