摘要
共价有机框架纳米片(CONs)是一种具有优异性质的二维片层材料,共价有机框架(COF)材料所具有的可预设计的周期性结构、原子级精度、定制功能性、良好的热稳定性、永久性孔隙以及极低的密度等特性更是赋予了CONs更大的开发潜力.针对COF纳米片剥离效率低、尺寸可控性差导致膜制备工艺复杂的问题,采用液相剥离法制备吡啶基COF纳米片(TpBpy-CON)并组装成COF膜(TpBpy-COM).在温和条件下对COF粉末进行剥离,获得均匀分散的TpBpy-CON.由此方法制得的COF纳米片具有较高的纵横比、比表面积及孔隙率.进而,通过真空辅助技术将纳米片组装成COF膜.所制备的TpBpy-COM膜展现出致密的表面结构和优异的H_(2)/CO_(2)气体分离性能.
Covalent organic framework nanosheets(CONs)are a class of two-dimensional layered materials with exceptional properties.The inherent features of COF materials,such as pre-designable periodic structures,atomiclevel precision,tunable functionality,excellent thermal stability,permanent porosity,and ultralow density,endow CONs with significant potential for further development.However,challenges such as low exfoliation efficiency of COF nanosheets and poor size controllability complicate membrane fabrication processes.In this study,a liquid-phase exfoliation method was employed to prepare pyridine-based COF nanosheets(TpBpy-CON)and assemble them into COF membranes(TpBpy-COM).COF powders were exfoliated under mild conditions to obtain size-controllable TpBpy-CON.The resulting COF nanosheets exhibited high aspect ratios,specific surface areas,and porosity.Subsequently,the nanosheets were assembled into COF membranes using vacuum-assisted techniques.The fabricated TpBpy-COM demonstrated a compact membrane surface structure and excellent H_(2)/CO_(2)gas separation performance.
作者
左宏瑜
张卫懿
廖耀祖
Hong-yu Zuo;Wei-yi Zhang;Yao-zu Liao(College of Materials Science and Engineering,Donghua University,State Key Laboratory for Modification of Chemical Fibers and Polymer Materials,Shanghai 201620)
出处
《高分子学报》
北大核心
2025年第6期981-991,共11页
Acta Polymerica Sinica
关键词
液相剥离
共价有机框架
纳米片组装
气体分子筛分
Liquid-phase exfoliation
Covalent organic frameworks
Nanosheet assembly
Gas molecular sieving
