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Salen–Mg‐doped NH2–MIL‐101(Cr) for effective CO2 adsorption under ambient conditions
Applied Organometallic Chemistry ( IF 3.7 ) Pub Date : 2020-09-09 , DOI: 10.1002/aoc.5993
Xianhua Wu 1, 2 , Ji Lin 3 , Jianxin Xie 1 , Xiaohui Zhao 3 , Dandan Liu 1 , Yun Xing 3 , Lixia Xu 2
Affiliation  

A novel metal‐doped metal–organic framework (MOF) was developed by incorporating salen–Mg into NH2–MIL‐101(Cr) structure under ambient conditions. The Schiff base complex was successfully prepared by condensing salicylaldehyde with a free amino group and then coordinating metal ions. Such a structure can endow the sample with higher CO2 adsorption performance. At 0°C and 1 bar, the salen–Mg‐modified sample achieves the maximum adsorption capacity of 2.18 mmol g−1 for CO2, which was 5.8% higher than the pristine salen–MOF under the same conditions. Notably, the Freundlich model indicates that the CO2 adsorption process of all samples conforms to reversible adsorption. However, the correlation coefficients (R2) of the Mg‐doped sample are lower than that of the pristine sample. Besides, the CO2/N2 adsorption selectivity and isosteric heat also show a similar trend. These results indicate that the salen–Mg can enhance the interaction between the material and CO2 molecules.

中文翻译:

Salen-Mg掺杂的NH2-MIL-101(Cr)可在环境条件下有效吸附CO2

通过在环境条件下将Salen-Mg掺入NH 2 -MIL-101(Cr)结构中,开发了一种新型的金属掺杂金属-有机骨架(MOF)。通过使水杨醛与游离氨基缩合,然后配位金属离子,成功制备了席夫碱配合物。这种结构可以使样品具有更高的CO 2吸附性能。在0°C和1 bar的压力下,salen–Mg改性的样品对CO 2的最大吸附容量为2.18 mmol g -1,在相同条件下比原始的salen–MOF高5.8%。值得注意的是,Freundlich模型表明所有样品的CO 2吸附过程均符合可逆吸附。但是,相关系数(掺镁样品的R 2)低于原始样品的R 2。此外,CO 2 / N 2的吸附选择性和等容热也表现出相似的趋势。这些结果表明,Salen–Mg可以增强材料与CO 2分子之间的相互作用。
更新日期:2020-11-06
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