Salen–Mg-doped NH2–MIL-101(Cr) for effective CO2 adsorption under ambient conditions |
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Authors: | Xianhua Wu Ji Lin Jianxin Xie Xiaohui Zhao Dandan Liu Yun Xing Lixia Xu |
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Institution: | 1. Yuxi Research Center for Eco-environmental Sciences on Plateau Lakes, Yuxi Normal University, Yuxi, Yunnan, 653100 China;2. Environmental Sanitation Monitoring and Inspection Section, Monitoring Center of Yunnan Center for Disease Control and Prevention, Kunming, Yunnan, 6500500 China;3. Atmospheric Environment Monitoring Room, Yunnan Environmental Monitoring Central, Kunming, Yunnan, 650500 China |
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Abstract: | 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. |
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Keywords: | CO2 adsorption CO2/N2 separation Freundlich model NH2–MIL-101(Cr) Schiff base |
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