MIL-101(Cr)/GO复合吸附剂的O2/N2分离性能研究

doi:10.6023/A19120449

化学学报 ›› 2020, Vol. 78 ›› Issue (3): 250-255.DOI: 10.6023/A19120449 上一篇下一篇

所属专题：多孔材料：金属有机框架(MOF)

研究论文

MIL-101(Cr)/GO复合吸附剂的O₂/N₂分离性能研究

刘洋^a,b, 夏潇潇^a,b, 谭媛元^a,b, 李松^a,b

a 华中科技大学能源与动力工程学院煤燃烧国家重点实验室武汉 430074;
b 华中科技大学中欧清洁与可再生能源学院武汉 430074

投稿日期:2019-12-26 发布日期:2020-02-24
通讯作者: 李松 E-mail:songli@hust.edu.cn
基金资助:
项目受国家自然科学基金面上项目（No.51672097）和中欧清洁与可再生能源学院双一流研究生教学平台培育基金（No.ICARE-RP-2018-HYDRO-001）资助.

O₂/N₂ Separation Performance of MIL-101(Cr)/Graphene Oxide

Liu Yang^a,b, Xia Xiaoxiao^a,b, Tan Yuanyuan^a,b, Li Song^a,b

a State Key Laboratory of Coal Combustion, School of Energy and Power Engineering, Huazhong University of Science and Technology, Wuhan 430074;
b China-EU Institute for Clean and Renewable Energy, Huazhong University of Science and Technology, Wuhan 430074

Received:2019-12-26 Published:2020-02-24
Supported by:
Project supported by the National Natural Science Foundation of China (No. 51672097) and the Double First-class Research Funding of China-EU Institute for Clean and Renewable Energy (No. ICARE-RP-2018-HYDRO-001).

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摘要/Abstract

变压吸附（PSA）制取O₂的核心是吸附剂.近年来，金属有机骨架（MOFs）被认为是一种具有广阔应用前景的新型吸附剂.通过水热法制备了MIL-101（Cr）/氧化石墨烯（GO）.结果表明，MIL-101（Cr）/GO-15具有更高的比表面积（3486 m²·g^-1）和更大的孔体积（2.39 cm³·g^-1），因此也表现出更高的O₂吸附量（0.54 mmol·g^-1）.进一步根据理想吸附溶液理论（IAST）预测了其在O₂/N₂体积比为1：4混合气体中的O₂/N₂选择性为1.2，相比MIL-101（Cr）提高了17.65%.同时，MIL-101（Cr）/GO-15的循环利用性能更佳，经过三次O₂吸脱附循环后，依然拥有高达80%的O₂吸附量，具有较好的循环再生性能.

关键词: O₂/N₂分离, 金属有机骨架, MIL-101(Cr)/GO, 循环再生性能

The pressure-swing adsorption (PSA) technology is the promising approach for O₂/N₂ separation because of its low cost and facile manipulation, in which adsorbents dominate the separation performance. In recent years, metal-organic frameworks (MOFs) have been recognized as the most potential adsorbents in gas adsorption and separation due to their ultrahigh surface area. In this work, MIL-101(Cr) with different weight percentages of graphene oxide (5%, 15% and 35%) was prepared by growing MIL-101(Cr) on pre-synthesized GO materials. The final product was activated under vacuum at 180℃ for 12 h. Structure characterization of different MIL-101(Cr)/GO composites revealed that MIL-101(Cr)/GO-15 with 15% GO additive exhibited the highest specific surface area (3486 m²·g^-1) and pore volume (2.39 cm³·g^-1) compared with pristine MIL-101(Cr) and the composites with 5% and 35% GO additives. The high surface area and pore volume are beneficial for the O₂ uptake of MIL-101(Cr)/GO-15. Compared with the O₂ uptake of MIL-101(Cr)/GO-5 (0.35 mmol·g^-1) and MIL-101(Cr)/GO-35 (0.31 mmol·g^-1), MIL-101(Cr)/GO-15 exhibited the highest uptake of 0.54 mmol·g^-1. Further pore size distribution analysis demonstrated that the enhanced O₂ uptake of MIL-101(Cr)/GO-15 can be ascribed to its increased fraction of mesopores. On the other hand, O₂/N₂ selectivity of different MIL-101(Cr)/GO composites was also calculated according to ideal adsorbed solution theory (IAST), from which it was found that MIL-101(Cr)/GO-15 displayed the highest O₂/N₂ selectivity (1.2) in a binary gas mixture with the volume fraction of O₂/N₂=1/4. Compared with pristine MIL-101, O₂/N₂ selectivity of MIL-101(Cr)/GO-15 was increased by 17.65%. Recyclability is one of the most important criteria to evaluate the gas adsorption performance of adsorbents. Therefore, the recyclability of MIL-101(Cr)/GO-15 was tested by measuring the O₂ adsorption and desorption isotherms for three cycles. It was revealed that 80% of O₂ uptake of MIL-101(Cr)/GO-15 was remained after three adsorp-tion/desorption cycles, implicating the outstanding recyclability of MIL-101(Cr)/GO-15.

Key words: O₂/N₂ separation, metal-organic framework, MIL-101(Cr)/GO, recyclability

引用此文

刘洋, 夏潇潇, 谭媛元, 李松. MIL-101(Cr)/GO复合吸附剂的O₂/N₂分离性能研究[J]. 化学学报, 2020, 78(3): 250-255.

Liu Yang, Xia Xiaoxiao, Tan Yuanyuan, Li Song. O₂/N₂ Separation Performance of MIL-101(Cr)/Graphene Oxide[J]. Acta Chimica Sinica, 2020, 78(3): 250-255.

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MIL-101(Cr)/GO复合吸附剂的O₂/N₂分离性能研究

O₂/N₂ Separation Performance of MIL-101(Cr)/Graphene Oxide

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