Adsorption of volatile organic compounds in porous metal–organic frameworks functionalized by polyoxometalates |
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| Authors: | Feng-Ji Ma Shu-Xia Liu Da-Dong Liang Guo-Jian Ren Feng Wei Ya-Guang Chen Zhong-Min Su |
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| Affiliation: | Key Laboratory of Polyoxometalates Science of the Ministry of Education, College of Chemistry, Northeast Normal University, Changchun 130024, China |
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| Abstract: | The functionalization of porous metal–organic frameworks (Cu3(BTC)2) was achieved by incorporating Keggin-type polyoxometalates (POMs), and further optimized via alkali metal ion-exchange. In addition to thermal gravimetric analysis, IR, single-crystal X-ray diffraction, and powder X-ray diffraction, the adsorption properties were characterized by N2 and volatile organic compounds (VOCs) adsorption measurements, including short-chain alcohols (C<4), cyclohexane, benzene, and toluene. The adsorption enthalpies estimated by the modified Clausius–Clapeyron equation provided insight into the impact of POMs and alkali metal cations on the adsorption of VOCs. The introduction of POMs not only improved the stability, but also brought the increase of adsorption capacity by strengthening the interaction with gas molecules. Furthermore, the exchanged alkali metal cations acted as active sites to interact with adsorbates and enhanced the adsorption of VOCs. |
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| Keywords: | Porous metal&ndash organic frameworks Polyoxometalates Functionalization Adsorption Volatile organic compounds |
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