Evaluation of the adsorption and desorption properties of zeolitic imidazolate framework-7 for volatile organic compounds through thermal desorption-gas chromatography

The adsorption mechanism and desorption properties of volatile organic compounds (VOCs) in a zeolitic imidazolate framework (ZIF-7) were studied by on-line thermal desorption-gas chromatography (TD-GC), and a high efficiency method for determination of harmful indoor gas levels has been developed. T...

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Bibliographic Details
Published in:Analytical methods 2018-10, Vol.1 (4), p.4894-491
Main Authors: Zhao, Ya-Ting, Yu, Li-Qing, Xia, Xin, Yang, Xin-Yu, Hu, Wei, Lv, Yun-Kai
Format: Article
Language:English
Subjects:
Activated carbon
Adsorbates
Adsorbents
Adsorption
Chromatography
Desorption
Flow rates
Flow velocity
Gas chromatography
Hydrophobicity
Linearity
Metal-organic frameworks
Organic compounds
Reproducibility
Size effects
Tubes
VOCs
Volatile organic compounds
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Summary:The adsorption mechanism and desorption properties of volatile organic compounds (VOCs) in a zeolitic imidazolate framework (ZIF-7) were studied by on-line thermal desorption-gas chromatography (TD-GC), and a high efficiency method for determination of harmful indoor gas levels has been developed. The loading volume, loading flow rate and desorption temperature were optimized. Additionally, ZIF-7 has been proved to be an effective adsorbent and its adsorption performance is superior to that of commercial Tenax TA and activated carbon. It has been proved that ZIF-7 is an ideal adsorbent for VOCs. It was suggested that there are hydrophobic interactions, π-π stacking effects, "gate-opening" effects and molecular size effects between adsorbates and ZIF-7. Therefore, the developed ZIF-7-based TD-GC method offered an excellent performance with a detection limit of 1.22-2.38 ng (S/N = 3), a quantification limit of 4.05-7.94 ng (S/N = 10), and a good linearity ( R 2 = 0.99), and relative standard deviation values (RSD, n = 5) were found to be in the range of 1.69-7.97%, and tube-to-tube reproducibility for three parallel tubes was 8.01%. The adsorption/desorption properties of VOCs on ZIF-7 were evaluated by TD-GC. It was found that there are hydrophobic interaction, π-π stacking effect, molecular size effect and "gate-opening" effect between VOCs and ZIF-7.
ISSN:1759-9660
1759-9679
DOI:10.1039/c8ay01856a