Journal
SEPARATION AND PURIFICATION TECHNOLOGY
Volume 266, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.seppur.2020.118087
Keywords
UiO-66; Defect-engineering; VOCs; Adsorption; Acetic acid
Categories
Funding
- National Natural Science Foundation of China [51672114, 21908085]
- Natural Science Foundation of Jiangsu Province, China [BK20161357, BK20190961]
- Foundation from Marine Equipment and Technology Institute for Jiangsu University of Science and Technology, China [HZ20190004]
- Jiangsu Postdoctoral Research Foundation [2020Z291]
- High-tech Ship Research Project of the Ministry of Industry and Information Technology, China [[2017] 614]
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The study successfully fabricated defect-engineering UiO-66 materials by introducing acetic acid as an interfering agent, enhancing the adsorption efficiency and capacity for volatile organic compounds. Proper adjustment of acetic acid concentration can improve the materials' adsorption capacity for benzene and toluene.
The great challenge in capturing harmful volatile organic compounds (VOCs) using Metal-Organic-Frameworks (MOFs) materials still rely on rationally modifying its appreciable microporous character in hydrostable structure. Defected structure in MOFs might be very beneficial for creating expected engineering adsorbent. In this study, defect-engineering UiO-66 via imparting acetic acid (HAc) as an interfering agent was successfully fabricated by a simple hydrothermal method. The physicochemical properties of the obtained materials were intensively ascertained and identified through a series of applicable characterizations. By the proper participation of tuning concentration of HAc (HAc/TAc = 24, molar ratio), the obtained adsorbent UiO-66-1.0HAc was endowed with the highest adsorption capacity for benzene (367.13 mg g(-1), 25 degrees C) in the known UiO-66 materials, which was 41.9% higher than that of the non-defected UiO-66. With a higher optimized added amount of HAc (HAc/TAc = 48, molar ratio), the adsorption capacity of UiO-66-2.0HAc to toluene achieved the highest capture values (410.21 mg g(-1), 25 degrees C), which boosted 93% compared with the original counterpart. This demonstrated improvement was ascribable to the imparted structural defect-engineering derived from the missing-linkers of MOFs increasing the unsaturated adsorption site and concomitant enlarged structural properties of the resultant material. By identifying the DIH (Difference in adsorption heat), the obtained maximum adsorption selectivity of UiO-66-1.0HAc to toluene/water was further enhanced to 64.4, which was 3.7 times the original UiO-66, owing to the existed defect-engineering in adsorbents, indicating the potential differential competitive adsorption effect for benzene and toluene under humid conditions.
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