Almáši Miroslav, Király Nikolas, Zeleňák Vladimír, Vilková Mária, Bourrelly Sandrine
Department of Inorganic Chemistry, Faculty of Science, P. J. Šafárik University Moyzesova 11 SK-041 54 Košice Slovak Republic
NMR Laboratory, Faculty of Science, P. J. Šafárik University Moyzesova 11 SK-041 01 Košice Slovak Republic.
RSC Adv. 2021 Jun 4;11(33):20137-20150. doi: 10.1039/d1ra02938j. eCollection 2021 Jun 3.
Two novel amorphous metal-organic frameworks (aMOFs) with chemical composition {[Zn(MTA)]·4HO·3DMF} (UPJS-13) and {[Cd(MTA)]·5HO·4DMF} (UPJS-14) built from Zn(ii) and Cd(ii) ions and extended tetrahedral tetraazo-tetracarboxylic acid (HMTA) as a linker were prepared and characterised. Nitrogen adsorption measurements were performed on as-synthesized (AS), ethanol exchanged (EX) and freeze-dried (FD) materials at different activation temperatures of 60, 80, 100, 120, 150 and 200 °C to obtain the best textural properties. The largest surface areas of 830 m g for UPJS-13 (FD) and 1057 m g for UPJS-14 (FD) were calculated from the nitrogen adsorption isotherms for freeze-dried materials activated at mild activation temperature (80 °C). Subsequently, the prepared compounds were tested as adsorbents of greenhouse gases, carbon dioxide and methane, measured at high pressures. The maximal adsorption capacities were 30.01 wt% CO and 4.84 wt% CH for UPJS-13 (FD) and 24.56 wt% CO and 6.38 wt% CH for UPJS-14 (FD) at 20 bar and 30 °C.
制备并表征了两种新型非晶态金属有机框架材料（aMOF），其化学组成为{[Zn(MTA)]·4H₂O·3DMF} （UPJS - 13）和{[Cd(MTA)]·5H₂O·4DMF} （UPJS - 14），它们由Zn(ii)和Cd(ii)离子以及作为连接体的扩展四面体四氮杂四羧酸（HMTA）构建而成。对合成态（AS）、乙醇交换态（EX）和冻干态（FD）的材料在60、80、100、120、150和200 °C的不同活化温度下进行了氮气吸附测量，以获得最佳的结构性能。根据在温和活化温度（80 °C）下活化的冻干材料的氮气吸附等温线计算得出，UPJS - 13（FD）的最大表面积为830 m²/g，UPJS - 14（FD）的最大表面积为1057 m²/g。随后，对制备的化合物作为温室气体二氧化碳和甲烷的吸附剂进行了高压测试。在20 bar和30 °C条件下，UPJS - 13（FD）对CO₂的最大吸附容量为30.01 wt%，对CH₄的最大吸附容量为4.84 wt%；UPJS - 14（FD）对CO₂的最大吸附容量为24.56 wt%，对CH₄的最大吸附容量为6.38 wt%。
