Salen–Mg‐doped NH2–MIL‐101(Cr) for effective CO2 adsorption under ambient conditions,Applied Organometallic Chemistry

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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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