A customized zeolitic imidazolate framework enabling bionic preconcentration of ultralow CO2

IF 6.8 2区材料科学 Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY

Science China Materials Pub Date : 2024-08-20 DOI:10.1007/s40843-024-3044-0

Hongyang Jin (, ), Ziyang Wang (, ), Guangli Yu (, ), Junchao Dong (, ), Shuai Zhao (, ), Fengchao Cui (, ), Hao Zhang (, ), Guolong Lu (, ), Xiaoqin Zou (, ), Zhiyong Chang (, )

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Abstract

Advancing our understanding of global climate, particularly in polar regions, requires accurate detection of carbon dioxide (CO₂) in ice cores and deep sea environments. However, detecting trace levels of CO₂ 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 CO₂. ZIF-8(CN) has small pores (4.4 Å) and cyano groups (–CN), enabling highly selective adsorption of CO₂ (36.2 cm³ g⁻¹) over N₂ (1.6 cm³ g⁻¹) at 298 K. The mechanism involves unique –CN⋯CO₂⋯–CN interactions within the pore structure. When cast into a film on an aluminum substrate, ZIF-8(CN) demonstrates exceptional CO₂ preconcentration capability (1 ppm in N₂) 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%.

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可实现超低二氧化碳仿生预浓缩的定制沸石咪唑酸盐框架

要深入了解全球气候，尤其是极地地区的气候，就必须准确探测冰芯和深海环境中的二氧化碳（CO2）。然而，在这些地区检测痕量二氧化碳水平是一项重大挑战。我们介绍了一种利用功能化沸石咪唑啉框架 ZIF-8(CN)进行超低二氧化碳检测的新型预浓缩方法。ZIF-8(CN) 具有小孔（4.4 Å）和氰基（-CN），在 298 K 下可高度选择性地吸附 CO2（36.2 cm3 g-1）而不是 N2（1.6 cm3 g-1）。当在铝基底上铸成薄膜时，ZIF-8(CN) 显示出卓越的二氧化碳预浓缩能力（在 N2 中为 1 ppm），预浓缩系数高达 748，优于传统的 ZIF 和沸石材料。此外，ZIF-8(CN) 预浓缩器的设计和制造采用了分形结构的仿生气流，优化了气膜接触，因此其性能进一步提高了 115%。

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来源期刊

Science China Materials Materials Science-General Materials Science

CiteScore

11.40

自引率

7.40%

发文量

949

期刊介绍： Science China Materials (SCM) is a globally peer-reviewed journal that covers all facets of materials science. It is supervised by the Chinese Academy of Sciences and co-sponsored by the Chinese Academy of Sciences and the National Natural Science Foundation of China. The journal is jointly published monthly in both printed and electronic forms by Science China Press and Springer. The aim of SCM is to encourage communication of high-quality, innovative research results at the cutting-edge interface of materials science with chemistry, physics, biology, and engineering. It focuses on breakthroughs from around the world and aims to become a world-leading academic journal for materials science.