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/N-2 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. (C) 2017 Elsevier B.V. All rights reserved.