Journal
JOURNAL OF MATERIALS SCIENCE
Volume 54, Issue 8, Pages 6186-6198Publisher
SPRINGER
DOI: 10.1007/s10853-018-03300-y
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Funding
- National Nature Science Foundation China [21878338]
- National Key Technology Support Program [2015BAL04B02]
- Key Research and Development Project of Hunan Province, China [2018SK2038]
- Hunan Collaborative Innovation Center of Building Energy Conservation & Environmental Control
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A novel hierarchically N-doped porous carbon material (NP) has been prepared using potassium citrate as the carbon source and urea as the nitrogen source by a facile one-step carbonization method. The resulting NP materials possess two important characteristics: (1) They have abundant nitrogen contents (up to 11.03%) and (2) they exhibit, in relation to porous carbon without urea doping (narrow micropore size), a wider mesopore size. The NP materials exhibit an excellent acetone adsorption capacity; a highest value of 1058mgg(-1) (15 degrees C) was provided by carbon material prepared in the case of urea/potassium citrate=1 and 800 degrees C, which is 158.6% higher than that of the N-free material. The total pore volume, especially the mesoporous volume, was the key factor to determine acetone adsorption under relative high pressure due to the presence of a multilayer adsorption based on adsorption isotherm models. Meanwhile, nitrogen functional groups promoted adsorption process at relative low pressure, and density functional theory results further confirm nitrogen-containing functional groups enhance adsorption interaction between carbon surface and acetone molecule through the hydrogen bonding interaction. This study paves a new way to develop a novel hierarchically N-doped porous carbon with controllable well-developed porosity for the adsorption applications.
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