Superior acetone uptake of hierarchically N-doped potassium citrate-based porous carbon prepared by one-step carbonization
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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 1058 mg g−1 (15 °C) was provided by carbon material prepared in the case of urea/potassium citrate = 1 and 800 °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.
This work was supported by the National Nature Science Foundation China (No. 21878338), the National Key Technology Support Program (No. 2015BAL04B02), the Key Research and Development Project of Hunan Province, China (No. 2018SK2038) and Hunan Collaborative Innovation Center of Building Energy Conservation & Environmental Control.
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