Chemical Industry and Engineering Progress ›› 2023, Vol. 42 ›› Issue (12): 6461-6468.DOI: 10.16085/j.issn.1000-6613.2023-0171

• Materials science and technology • Previous Articles    

Microwave synthesis of MOF-808 and its water vapor uptake characteristics

CHEN Fei1,2(), DING Yudong1,2(), MA Lijiao2, ZHU Xun1,2, CHENG Min1,2, LIAO Qiang1,2   

  1. 1.Key Laboratory of Low-grade Energy Utilization Technologies and Systems (Chongqing University), Ministry of Education, Chongqing 400030, China
    2.Institute of Engineering Thermophysics, Chongqing University, Chongqing 400030, China
  • Received:2023-02-10 Revised:2023-05-04 Online:2024-01-08 Published:2023-12-25
  • Contact: DING Yudong

微波合成MOF-808及其水蒸气捕集特性

陈飞1,2(), 丁玉栋1,2(), 马丽娇2, 朱恂1,2, 程旻1,2, 廖强1,2   

  1. 1.重庆大学低品位能源利用技术及系统教育部重点实验室,重庆 400030
    2.重庆大学工程热物理研究所,重庆 400030
  • 通讯作者: 丁玉栋
  • 作者简介:陈飞(1996—),男,硕士研究生,研究方向为金属有机骨架材料的制备。E-mail:zunyixiaohuo@163.com
  • 基金资助:
    国家自然科学基金面上项目(51876013);国家自然科学基金创新研究群体项目(52021004)

Abstract:

Metal organic frameworks (MOFs) as one of new porous materials, have promising application in drying field. In this study, a rapid microwave synthesis of MOF-808 at 140℃ and 12.83mol/L formic acid concentration was reported. The obtained MOF-808 was thoroughly characterized by X-ray diffractometer, field emission scanning electron microscope and physical adsorption instrument. The water vapor adsorption capacity of MOF-808 increased with increasing formic acid concentration (0.521g/g to 0.810g/g), decreased with the increase of adsorption temperature, and the optimal adsorption working conditions were 30℃ and 90% relative humidity. MOF-808 showed a higher rate of adsorption at high humidity. The average water vapor adsorption capacity of MOF-808 was 0.529g/g with standard deviation 0.018 under the conditions of various CO2 concentrations, which indicated that MOF-808 had a good adsorption selectivity for water vapor. The variation of CO2 concentration did not affect its water vapor uptake performance. The regeneration efficiency of MOF-808 was higher than 90% after eight cycles at lower temperature (70℃), which indicated that MOF-808 had a great energy conservation potential and much better cycle stability.

Key words: microwave heating, MOF, water vapor, adsorption, drying, carbon dioxide, selectivity

摘要:

金属有机骨架(MOFs)作为新型多孔材料,在干燥领域极具应用前景。本研究提供了一种MOF-808微波加热快速合成法,合成温度为140℃,甲酸浓度12.83mol/L。通过X射线衍射仪、场发射扫描电子显微镜、物理吸附仪等对MOF-808的样品组成、结构、比表面积以及形貌等进行表征分析。合成MOF-808材料的水蒸气吸附量随甲酸浓度增加而提高(由0.521g/g提高到0.810g/g),随吸附温度升高而降低,高湿度下MOF-808表现出较快的吸附速率,最佳的吸附工况为30℃、90%相对湿度。含湿混合气中CO2浓度变化时,MOF-808平衡吸附量均值0.529g/g,标准差0.018,表明材料对水蒸气具有良好吸附选择性,CO2不会对MOF-808捕集水蒸气能力产生影响。在较低再生温度(70℃)下MOF-808经过8次循环后再生效率仍高于90%,说明MOF-808材料用于干燥过程节能潜力较大,循环稳定性好。

关键词: 微波加热, 金属有机骨架, 水蒸气, 吸附, 干燥, 二氧化碳, 选择性

CLC Number: 

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