中国物理B ›› 2022, Vol. 31 ›› Issue (11): 118101-118101.doi: 10.1088/1674-1056/ac7b1f

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Water adsorption performance of UiO-66 modified by MgCl2 for heat transformation applications

Jia-Li Liu(刘佳丽)1, Guo-Dong Fu(付国栋)1, Ping Wu(吴平)1,†, Shang Liu(刘尚)1, Jin-Guang Yang(杨金光)1, Shi-Ping Zhang(张师平)1, Li Wang(王立)2, Min Xu(许闽)3, and Xiu-Lan Huai(淮秀兰)3   

  1. 1 Beijing Key Laboratory for Magneto-Photoelectrical Composite and Interface Science, School of Mathematics and Physics, University of Science and Technology Beijing, Beijing 100083, China;
    2 School of Energy and Environmental Engineering, University of Science and Technology Beijing, Beijing 100083, China;
    3 Institute of Engineering Thermophysics, Chinese Academy of Sciences, Beijing 100190, China
  • 收稿日期:2022-04-01 修回日期:2022-06-19 接受日期:2022-06-22 出版日期:2022-10-17 发布日期:2022-11-01
  • 通讯作者: Ping Wu E-mail:pingwu@sas.ustb.edu.cn
  • 基金资助:
    Project supported by the National Natural Science Foundation of China (Grant No. 51836009).

Water adsorption performance of UiO-66 modified by MgCl2 for heat transformation applications

Jia-Li Liu(刘佳丽)1, Guo-Dong Fu(付国栋)1, Ping Wu(吴平)1,†, Shang Liu(刘尚)1, Jin-Guang Yang(杨金光)1, Shi-Ping Zhang(张师平)1, Li Wang(王立)2, Min Xu(许闽)3, and Xiu-Lan Huai(淮秀兰)3   

  1. 1 Beijing Key Laboratory for Magneto-Photoelectrical Composite and Interface Science, School of Mathematics and Physics, University of Science and Technology Beijing, Beijing 100083, China;
    2 School of Energy and Environmental Engineering, University of Science and Technology Beijing, Beijing 100083, China;
    3 Institute of Engineering Thermophysics, Chinese Academy of Sciences, Beijing 100190, China
  • Received:2022-04-01 Revised:2022-06-19 Accepted:2022-06-22 Online:2022-10-17 Published:2022-11-01
  • Contact: Ping Wu E-mail:pingwu@sas.ustb.edu.cn
  • Supported by:
    Project supported by the National Natural Science Foundation of China (Grant No. 51836009).

摘要: UiO-66 is a potential material for adsorption heat transformation (AHT) with high specific surface area, and excellent thermal and chemical stability. However, the low water adsorption capacity of UiO-66 in the low relative pressure range ($0< P/P_0< 0.3$) limits its application in AHT. We prepare the UiO-66 modified by MgCl$_{2 }$ through using the solvothermal method and impregnation method, and study their water vapor adsorption performances and heat storage capacities. Attributed to the extremely high saturated water uptake and excellent hydrophilicity of MgCl$_{2}$, the water adsorption performance of UiO-66 is improved, although the introduction of MgCl$_{2}$ reduces its specific surface area and pore volume. The water adsorption capacity at $P/P_0=0.3$ and the saturated water adsorption capacity of the UiO-66 (with MgCl$_{2}$ content of 0.57 wt%) modified by the solvothermal method are 0.27 g/g and 0.57 g/g at 298 K, respectively, which are 68.8% and 32.6% higher than the counterparts of pure UiO-66, respectively. Comparing with pure UiO-66, the water adsorption capacity of the UiO-66 (with MgCl$_{2}$ content of 1.02 wt%) modified by the impregnation method is increased by 56.3% and 14.0% at the same pressure, respectively. During 20 water adsorption/desorption cycles, the above two materials show high heat storage densities ($\sim1293 $ J/g and 1378 J/g). Therein, the UiO-66 modified by the solvothermal method exhibits the excellent cyclic stability. These results suggest that the introduction of an appropriate amount of MgCl$_{2}$ makes UiO-66 more suitable for AHT applications.

关键词: adsorption heat transformation, UiO-66, water vapor adsorption, MgCl2

Abstract: UiO-66 is a potential material for adsorption heat transformation (AHT) with high specific surface area, and excellent thermal and chemical stability. However, the low water adsorption capacity of UiO-66 in the low relative pressure range ($0< P/P_0< 0.3$) limits its application in AHT. We prepare the UiO-66 modified by MgCl$_{2 }$ through using the solvothermal method and impregnation method, and study their water vapor adsorption performances and heat storage capacities. Attributed to the extremely high saturated water uptake and excellent hydrophilicity of MgCl$_{2}$, the water adsorption performance of UiO-66 is improved, although the introduction of MgCl$_{2}$ reduces its specific surface area and pore volume. The water adsorption capacity at $P/P_0=0.3$ and the saturated water adsorption capacity of the UiO-66 (with MgCl$_{2}$ content of 0.57 wt%) modified by the solvothermal method are 0.27 g/g and 0.57 g/g at 298 K, respectively, which are 68.8% and 32.6% higher than the counterparts of pure UiO-66, respectively. Comparing with pure UiO-66, the water adsorption capacity of the UiO-66 (with MgCl$_{2}$ content of 1.02 wt%) modified by the impregnation method is increased by 56.3% and 14.0% at the same pressure, respectively. During 20 water adsorption/desorption cycles, the above two materials show high heat storage densities ($\sim1293 $ J/g and 1378 J/g). Therein, the UiO-66 modified by the solvothermal method exhibits the excellent cyclic stability. These results suggest that the introduction of an appropriate amount of MgCl$_{2}$ makes UiO-66 more suitable for AHT applications.

Key words: adsorption heat transformation, UiO-66, water vapor adsorption, MgCl2

中图分类号:  (Porous materials; granular materials)

  • 81.05.Rm
81.05.-t (Specific materials: fabrication, treatment, testing, and analysis) 88.80.-q (Energy delivery and storage) 88.05.Sv (Energy use in heating and cooling of residential and commercial buildings)