A customized zeolitic imidazolate framework enabling bionic preconcentration of ultralow CO_(2)  

一种定制的沸石咪唑框架用于仿生预富集超低浓度二氧化碳

作　　者：Hongyang Jin Ziyang Wang Guangli Yu Junchao Dong Shuai Zhao Fengchao Cui Hao Zhang Guolong Lu Xiaoqin Zou Zhiyong Chang 靳宏杨;王子阳;于广莉;董俊超;赵帅;崔凤超;张浩;卢国龙;邹小勤;常志勇(Key Laboratory of Bionic Engineering(Ministry of Education),College of Biological and Agricultural Engineering,Jilin University,Changchun 130022,China;Faculty of Chemistry,Northeast Normal University,Changchun 130024,China)

机构地区：[1]Key Laboratory of Bionic Engineering(Ministry of Education),College of Biological and Agricultural Engineering,Jilin University,Changchun 130022,China [2]Faculty of Chemistry,Northeast Normal University,Changchun 130024,China

出　　处：《Science China Materials》2024年第10期3401-3407,共7页中国科学（材料科学）（英文版）

基　　金：supported by the National Natural Science Foundation of China(22375031,22131004,U21A20330,U22A20184 and 22208224);National Key R&D Program of China(2022YFB3805902 and 2023YFC2812603);“111”Program(B18012);Jilin Natural Science Fund for Excellent Young Scholars(20230508116RC);Science&Technology Department of Jilin Province(20230101023JC);Fundamental Research Funds for the Central Universities(JGPY202103 and 2412023YQ001);Excellent Youth Lift Plan from Shenyang University of Chemical Technology(2022YQ003)。

摘　　要：Advancing our understanding of global climate,particularly in polar regions,requires accurate detection of carbon dioxide(CO_(2))in ice cores and deep sea environments.However,detecting trace levels of CO_(2)in these areas presents significant challenges.We introduce a novel preconcentration approach using functionalized zeolitic imidazolate framework,ZIF-8(CN),for the detection of ultra-low CO_(2).ZIF-8(CN)has small pores(4.4■and cyano groups(–CN),enabling highly selective adsorption of CO_(2)(36.2 cm^(3)g^(−1))over N_(2)(1.6 cm^(3)g^(−1))at 298 K.The mechanism involves unique–CN···CO_(2)···–CN interactions within the pore structure.When cast into a film on an aluminum substrate,ZIF-8(CN)demonstrates exceptional CO_(2)preconcentration capability(1 ppm in N_(2))with an extraordinary preconcentration factor of 748,outperforming traditional ZIF and zeolite materials.Additionally,a ZIF-8(CN)preconcentrator is designed and fabricated with bionic gas flow of fractal structure which optimizes the gas-film contact,and thus its performance is further improved by 115%.增进对全球气候的认知,特别是极地地区,我们需要准确检测冰芯和深海环境中的二氧化碳浓度.然而,检测这些地区中微量二氧化碳浓度给目前检测技术带来了严重挑战.我们报道了一种基于功能化沸石咪唑框架ZIF-8(CN)预富集的检测超低浓度二氧化碳的新方法.ZIF-8(CN)具有的小孔(4.4■)结构以及氰基(-CN)基团,赋予此材料从氮气中高选择性地吸附二氧化碳的能力(298 K下二氧化碳吸附量36.2 cm^(3)g^(-1),氮气吸附量1.6 cm^(3)g^(-1).该吸附机制主要涉及ZIF-8(CN)孔道内独特的-CN···CO_(2)···-CN相互作用.当ZIF-8(CN)浇铸于铝板形成薄膜后,表现出非凡的二氧化碳预富集性能(二氧化碳在氮气中的浓度为1 ppm),具有超高的748预富集因子,优于传统的金属有机框架和沸石材料.此外,利用仿生气流设计理念,我们制备了ZIF-8(CN)预富集器,其预富集性能进一步提高了115%.

关 键 词：zeolitic imidazolate frameworks selective CO_(2)adsorption gas preconcentration MOF films 

分 类 号：X701[环境科学与工程—环境工程] O647.3[理学—物理化学]