Study on the structure-activity relationship of porous carbon materials prepared with supercritical CO₂ assistance in VOCs adsorption
超临界CO₂辅助制备多孔碳材料对VOCs吸附的构效关系研究

摘要

超临界CO₂辅助制备技术因其独特的流体性质和温和的操作条件，在多孔碳材料的结构调控中展现出显著优势。本研究以挥发性有机化合物（VOCs）吸附性能为核心，探讨多孔碳材料的孔径分布、比表面积、表面化学官能团与吸附效果之间的构效关系。通过调节超临界CO₂处理压力、温度和时间，实现孔结构的可控构筑，并结合BET比表面积分析、孔径分布测试及傅里叶变换红外光谱（FTIR）表征材料表面化学特性。实验结果表明，适宜的中孔/微孔比例和表面含氧官能团可显著提升VOCs的吸附容量与选择性。该研究不仅揭示了超临界CO₂在多孔碳材料制备中的结构调控机制，也为高效吸附剂的绿色合成提供了可行路径，对VOCs污染治理具有重要的应用价值。

Abstract

Due to its unique fluid properties and mild operating conditions, the supercritical CO₂-assisted preparation technology shows significant advantages in the structural regulation of porous carbon materials. Focusing on the adsorption performance of volatile organic compounds (VOCs), this study explores the structure-activity relationship between the pore size distribution, specific surface area, surface chemical functional groups of porous carbon materials and their adsorption effects. By adjusting the pressure, temperature, and time of supercritical CO₂ treatment, the controllable construction of pore structures is achieved. Meanwhile, the surface chemical properties of the materials are characterized using BET specific surface area analysis, pore size distribution testing, and Fourier transform infrared spectroscopy (FTIR). The experimental results indicate that an appropriate ratio of mesopores to micropores and surface oxygen-containing functional groups can significantly enhance the adsorption capacity and selectivity of VOCs. This research not only reveals the mechanism of structural regulation of supercritical CO₂ in the preparation of porous carbon materials but also provides a feasible path for the green synthesis of high-efficiency adsorbents, which has important application value for VOCs pollution control.