Biomass-based hierarchical porous carbon with ultrahigh surface area for super-efficient adsorption and separation of acetone and methanol
发布时间：2024-09-30
点击次数：
DOI码：10.1016/j.seppur.2021.118690
所属单位：中南大学
发表刊物：Separation and Purification Technology
关键字：GCMC; Oxygen groups; Porous carbon; Ultrahigh surface area; VOCs adsorption and separation
摘要：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.
论文类型：期刊论文
论文编号：118690
卷号：269
ISSN号：13835866
是否译文：否
发表时间：2021-08-15
收录刊物：SCI
发布期刊链接：https://www.sciencedirect.com/science/article/pii/S1383586621004020?via%3Dihub