Rapid extraction of trace benzene by a crown-ether-based metal-organic framework  

作　　者：Zhonghang Chen Peiyu Fang Jiangnan Li Xue Han Wenhao Huang Wenyue Cui Zhiwei Liu Mark R.Warren David Allan Peng Cheng Sihai Yang Wei Shi 

机构地区：[1]Frontiers Science Center for New Organic Matter,Key Laboratory of Advanced Energy Materials Chemistry(MOE),and State Key Laboratory of Advanced Chemical Power Sources,College of Chemistry,Nankai University,Tianjin 300071,China [2]Beijing National Laboratory for Molecular Sciences,College of Chemistry and Molecular Engineering,Peking University,Beijing 100871,China [3]College of Chemistry,Beijing Normal University,Beijing 100875,China [4]Diamond Light Source,Harwell Science and Innovation Campus,Oxfordshire OX110DE,UK [5]Haihe Laboratory of Sustainable Chemical Transformations,Tianjin 300192,China

出　　处：《National Science Review》2024年第12期220-227,共8页国家科学评论(英文版)

基　　金：supported by the National Natural Science Foundation of China(22261132509,92156002,92156016,and 21931004);the RSC Researcher Collaborations Grant(C23-8460402254);Beijing National Laboratory for Molecular Sciences.W.S.and S.Y.acknowledge the receipt of a Newton Advanced Fellowship from the Royal Society(NAF\R1\180297);P.F.acknowledges the China Postdoctoral Science Foundation(2023TQ0004).

摘　　要：Due to almost identical boiling points of benzene and cyclohexane,the extraction of trace benzene from cyclohexane is currently performed via the energy-intensive extractive disti l lation method.Their adsorptive separation by porous materials is hampered by their similar dimensions.Metal-organic frameworks(MOFs)with versatile pore environments are capable of molecular discrimination,but the separation of trace substrates in liquid-phase remains extremely challenging.Herein,we report a robust MOF(NKU-300)with triangular channels decorated with crown ether that can discriminate trace benzene from cyclohexane,exhibiting an unprecedented selectivity of 8615(10)for the mixture of benzene/cyclohexane(v/v=1/1000).Remarkably,NKU-300 demonstrates exceptional selectivities for the extraction of benzene from cyclohexane over a wide range of concentrations of 0.1%-50%with ultrafast sorption kinetics and excellent stability.Single-crystal X-ray diffraction and computational modelling reveal that multiple supramolecular interactions cooperatively immobilise benzene molecules in the triangular channel,enabling superior separation performance.This study wi l l promote the application of advanced sorbents with tailored binding sites for challenging industrial separations.

关 键 词：metal-organic frameworks crown ether triangular channel benzene/cyclohexane separation crystal structure 

分 类 号：TQ231.14[化学工程—有机化工] O647.3[理学—物理化学]