Size-Controllable Synthesis of ZIF-8 and Derived Nitrogen-Rich Porous Carbon for CO2 and VOCs Adsorption
发布时间：2024-09-30
点击次数：
DOI码：10.1002/slct.202203273
所属单位：中南大学
发表刊物：ChemistrySelect
关键字：Adsorption; Nitrogen-rich; Particle size effect; Porous carbon; ZIF-8
摘要：It's acknowledged that surface chemical and pore structure of adsorbent are main parameters to determine adsorption results. Herein, we prepared zeolitic imidazolate frameworks-8 (ZIF-8) with different average sizes (50, 120, and 2200 nm) and demonstrated their specific surface area and pore volume decreased with increasing particle size. ZIF-8 (ZN) exhibits a large specific surface area (1626.4 m2 g−1) and total pore volume (1.088 mL g−1), but it has been shown to lack the non-specific adsorption capacity for the adsorbate. Carbonization at 800 °C is proved to be an effective method to expose massive surface nitrogen-containing functional groups and adjust the aperture to an appropriate pore size range for derived porous carbon of ZIF-8 (ZCN). High nitrogen content (18.7 at. %) greatly improves the affinity for CO2 and Volatile Organic Compounds (VOCs), as explained by the density functional theory (DFT) calculation results. Meanwhile, particle size influences the pore-forming results after carbonization directly. Among them, ZC50 generates a certain amount of narrow micropore in range of 0.7–1.0 nm, located in the optimal pore size range of CO2 adsorption calculated by Grand canonical Monte Carlo (GCMC) simulation, thus possessing the largest CO2 adsorption capacity (4.03 mmol g−1 at 25 °C). Besides, ZC120 exhibits more superior mesopore structure that could strengthen multilayer adsorption for VOCs.
论文类型：期刊论文
论文编号：e202203273
卷号：7
期号：36
ISSN号：23656549
是否译文：否
发表时间：2022-09-27
收录刊物：SCI
发布期刊链接：https://chemistry-europe.onlinelibrary.wiley.com/doi/10.1002/slct.202203273