Recently, selective removal of CO2 from offgas of various industries is very important, and metal–organic frameworks (MOFs) have been actively studied as a potential adsorbent. In this study, a typical MOF with a high porosity, MIL-101, was modified by loading (via ship in a bottle technique) basic polymer, polyvinylamine (PVAm), for the first time, in order to improve the performances of MIL-101 in adsorption/capture of CO2 from offgas. The obtained PVAm@MIL-101 showed highly increased selectivity (CO2/N2) and capacity in CO2 adsorption under low pressure, when suitable quantity of PVAm was introduced. Or, the adsorption selectivity and capacity of PVAm(0.7)@MIL-101 were around 11 and 2.5 times to those of pristine MIL-101, respectively at 298 K. Moreover, the PVAm(0.7)@MIL-101 was readily recycled for continuous uses and had optimum isosteric heat of adsorption (−ΔHads = 35–50 kJ/mol) for a wide range of CO2 adsorption. Therefore, loading PVAm into porous MOFs can be recommended as an attractive way to improve the performances of the MOFs in CO2 adsorption/capture from offgas under low pressure.
All Science Journal Classification (ASJC) codes
- Environmental Chemistry
- Chemical Engineering(all)
- Industrial and Manufacturing Engineering