Škrjanc Aljaž, Opresnik Mojca, Gabrijelčič Matej, Šuligoj Andraž, Mali Gregor, Zabukovec Logar Nataša
Department of Inorganic Chemistry and Technology, National Institute of Chemistry, Hajdrihova 19, SI-1001 Ljubljana, Slovenia.
Postgraduate School, University of Nova Gorica, Vipavska 13, SI-5000 Nova Gorica, Slovenia.
Molecules. 2023 Oct 12;28(20):7056. doi: 10.3390/molecules28207056.
The fast adsorption kinetics of zeolitic imidazolate frameworks (ZIFs) enable a wide range of sorption applications. The most commonly used framework, ZIF-8, is relatively non-polar. Increasing the polarity of ZIF-8 through the encapsulation of different polar species shows promise for enhancing the sorption performance for pure CO. Recently, the outlook has re-focused on gas mixtures, mostly in the context of post-combustion CO capture from wet flue gasses. While water is known to sometimes have a synergistic effect on CO sorption, we still face the potential problem of preferential water vapor adsorption. Herein, we report the preparation of three ZIF-8/organic dye (OD) composites using Congo red, Xylenol orange, and Bromothymol blue, and their impact on the sorption properties for CO, water, and a model wet CO system at 50% RH. The results show that the preparation of OD composites can be a promising way to optimize adsorbents for single gasses, but further work is needed to find superior ZIF@OD for the selective sorption of CO from wet gas mixtures.
沸石咪唑酯骨架材料（ZIFs）的快速吸附动力学使其具有广泛的吸附应用。最常用的骨架材料ZIF-8相对非极性。通过封装不同极性物质来增加ZIF-8的极性，有望提高对纯CO的吸附性能。最近，研究重点重新聚焦于混合气体，主要是在从湿烟道气中进行燃烧后CO捕集的背景下。虽然已知水有时对CO吸附有协同作用，但我们仍面临优先吸附水蒸气的潜在问题。在此，我们报告了使用刚果红、二甲酚橙和溴百里酚蓝制备三种ZIF-8/有机染料（OD）复合材料，以及它们对CO、水和50%相对湿度下的模拟湿CO体系的吸附性能的影响。结果表明，制备OD复合材料可能是优化单一气体吸附剂的一种有前途的方法，但需要进一步开展工作以找到用于从湿气混合物中选择性吸附CO的优质ZIF@OD。
