التفاصيل البيبلوغرافية
| العنوان: |
A metal-OH group modification strategy to prepare highly-hydrophobic MIL-53-Al for efficient acetone capture under humid conditions. |
| المؤلفون: |
Shi, Jiaqi1,2 (AUTHOR), Han, Rui1,2 (AUTHOR), Lu, Shuangchun1,2 (AUTHOR), Liu, Qingling1,2 (AUTHOR) liuql@tju.edu.cn |
| المصدر: |
Journal of Environmental Sciences (Elsevier). Sep2021, Vol. 107, p111-123. 13p. |
| مصطلحات موضوعية: |
ACETONE, FOURIER transform infrared spectroscopy, SCANNING electron microscopes, PHOSPHONIC acids, ADSORPTION capacity, WATER vapor |
| مستخلص: |
[Display omitted] A series of highly-hydrophobic MIL-53-Al (MIL = Materials of Institut Lavoisier) frameworks synthesized via decoration of the Al-OH groups by alkyl phosphonic acid were developed as adsorbents for removing acetone from humid gas streams. The newly prepared materials were characterized by X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FT-IR), scanning electron microscope (SEM), N 2 adsorption-desorption and thermogravimetric analysis (TGA). Their adsorption behaviors toward acetone vapor under dry and wet conditions were studied subsequently. Results showed that alkyl phosphonic acid was successfully grafted into MIL-53-Al skeleton through coordinating interaction with Al3+ generating MIL-53-Al@C x (x = 12, 14, 18). The MIL-53-Al@C x exhibited similar crystal structure and thermal stability to parent MIL-53-Al. Furthermore, the modified materials showed significantly enhanced hydrophobicity. The water vapor uptake of MIL-53-Al@C 14 decreased by 72.55% at 75% relative humidity (RH). Dynamic adsorption experiments demonstrated that water vapor had almost no effect on the acetone adsorption performance of MIL-53-Al@C 14. Under the condition of 90% RH, the acetone adsorption capacity of MIL-53-Al@C 14 was 102.98% higher than that of MIL-53-Al. Notably, MIL-53-Al@C 14 presented excellent adsorption reversibility and regeneration performance in 10 adsorption-desorption cycles. Taken together, the strategy of metal-OH group modification is an attractive way to improve the acetone adsorption performance over metal-organic frameworks (MOFs) under humid conditions. Besides, MIL-53-Al@C 14 would be deemed as a promising candidate for capturing acetone in high moisture environment. [ABSTRACT FROM AUTHOR] |
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| قاعدة البيانات: |
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