Microporous carbons were developed for CO2 capture from polyvinylidene fluoride (PVDF) via a simple carbonization method. The carbonization was carried out in the temperature range of 400-800 °C, and the effects of the carbonization temperature on the characteristics and CO2 adsorption behavior of the prepared carbon materials were investigated by both experiments and density functional theory studies. The textural characteristics of the carbon materials were highly dependent on the carbonization temperature, and narrow micropores (<0.7 nm) were predominantly generated from the decomposition of PVDF giving off fluorine during carbonization. The specific surface area and pore volume increased up to 1011 m2 g-1 and 0.416 cm3 g-1, respectively, and the highest CO2 adsorption capacity of 3.59 mol kg-1 was obtained at 25 °C and ∼1 bar in PVDF carbonized at 800 °C. The carbonized PVDFs also exhibited highly stable CO2 adsorption uptake and rapid kinetics through repeated adsorption-desorption cycles, showing that carbonized PVDFs are promising adsorbents for CO2 capture. The density functional theory calculation suggested that stable configuration with favorable adsorption energy can be introduced by the removal of fluorine from PVDF, which results in the reduction of repulsive interactions between electronegative fluorine in PVDF and oxygen in CO2 molecule.
Bibliographical noteFunding Information:
This work was supported by a National Research Foundation (NRF) grant funded by the Korean government's Ministry of Science, ICT, and Future Planning, through the Basic Science Research Program ( 2012-008941 ), the Korea CCS R&D Center (KCRC) Grant (no. 2014 M1A8A1049251 ), and the Human Resources Development Program ( 20134010200600 ) of the Korea Institute of Energy Technology Evaluation and Planning (KETEP) grant funded by the Korean government's Ministry of Trade, Industry, and Energy. The authors would like to acknowledge Ms. Oh Jinhwa of Korea Basic Science Institute (KBSI) for technical support in the TEM experiments.
© 2015 Elsevier Inc.
All Science Journal Classification (ASJC) codes
- Materials Science(all)
- Condensed Matter Physics
- Mechanics of Materials