DOI number:10.1016/j.seppur.2021.118690
Affiliation of Author(s):中南大学
Journal:Separation and Purification Technology
Key Words:GCMC; Oxygen groups; Porous carbon; Ultrahigh surface area; VOCs adsorption and separation
Abstract:In this study, biomass-based hierarchical porous carbons (HPCs) were synthesized by developing a cost-effective strategy that combines pyrolysis with KOH activation. The highest surface area of HPCs is up to 3936 m2 g−1, which presents record-high acetone (26.1 mmol g−1 at 18 kPa) and methanol (46.9 mmol·g−1 at 15 kPa) adsorption capacity at 25 °C. Based on experiments and molecular simulations, the total pore volume mainly determines adsorption amount of acetone and methanol at relatively high pressure. However, the oxygen groups can provide adsorption sites for acetone and methanol at relatively low pressure, which is attributed to electrostatic interaction between gas molecules and carbon frameworks. Additionally, the narrow micropore determines the acetone/methanol selectivity at relatively low pressure, and the oxygen groups have no benefit effect on acetone/methanol selectivity. Therefore, this work provides theoretical and experimental support for the design, preparation, and application of VOCs adsorbents.
Indexed by:Journal paper
Document Code:118690
Volume:269
ISSN No.:13835866
Translation or Not:no
Date of Publication:2021-08-15
Included Journals:SCI
Links to published journals:https://www.sciencedirect.com/science/article/pii/S1383586621004020?via%3Dihub