A novel DOBDC-functionalized MIL-100(Fe) and its enhanced CO2 capacity and selectivity

•A novel DOBDC@MIL-100(Fe) was successfully prepared via a one-pot synthesis.•DOBDC@MIL-100(Fe) exhibited a 62% improved CO2 capacity compared to MIL-100(Fe).•Its IAST-predicted CO2/N2 adsorptive selectivity was up to 50 at ambient condition.•More CO2 adsorptive sites on DOBDC@MIL-100(Fe) were formed due to DOBDC doping.

A novel DOBDC@MIL-100(Fe) (DOBDC: 2,5-dioxido-1,4-benzenedicarboxylate) was successfully synthesized by grafting DOBDC to MIL-100(Fe) via a one-pot synthesis. The resultant DOBDC@MIL-100(Fe) was characterized and tested for their selective CO2 adsorption performance. Results showed that the resultant DOBDC@MIL-100(Fe) exhibited a 62% improved CO2 capacity compared to that of MIL-100(Fe) at room temperature and 1 bar, and its CO2/N2 adsorption selectivity was up to 50 at ambient condition, being 8 times higher when compared to MIL-100(Fe). CO2-TPD curve of DOBDC@MIL-100(Fe) exhibited two desorption peaks, while that of MIL-100(Fe) exhibited only one peak, confirming that a new type of CO2 adsorption sites was created in DOBDC@MIL-100(Fe) due to introduction of DOBDC, which resulted in the enhanced CO2 capacity of DOBDC@MIL-100(Fe). Besides, DOBDC@MIL-100(Fe) showed excellent moisture-stability after being exposed to 90% relative humidity for 30 days. The improved CO2 capacity and decent steam stability of DOBDC@MIL-100(Fe) will make it very promising in potential practical application of CO2 capture.

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