Journal
JOURNAL OF PHYSICAL CHEMISTRY C
Volume 118, Issue 36, Pages 21049-21056Publisher
AMER CHEMICAL SOC
DOI: 10.1021/jp507074x
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Funding
- National Research Foundation of Korea (NRF) - Korea government (MSIP) [2013R1A2A2A01007176]
- National Research Foundation of Korea [2013R1A2A2A01007176] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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Pyridine (Py) was adsorbed over metalorganic frameworks (MOFs) (UiO-66 and UiO-66-NH2 with different incorporated amino group content) in both vapor and liquid phases to understand the interactions between the basic adsorbate Py and a basic or neutral adsorbent. Py was adsorbed more favorably over UiO-66-NH2 than over the pristine UiO-66. Not only the adsorbed amount of Py but also adsorption kinetics increased with increasing amino group content in UiO-66s, showing that amino groups in the MOFs benefit the adsorption of Py in both vapor and liquid phases. To understand the favorable interaction between Py and basic UiO-66, calculations were also carried out. The results, including calculations, suggested that hydrogen bonding is important for improving the adsorption of Py over UiO-66s. However, the expected repulsive interaction between basic Py and amino groups of UiO-66-NH2 was not observed. Therefore, it is vital that specific interaction mechanisms should be considered in order to understand selective adsorption processes. Moreover, the amount of adsorbed Py in the vapor phase increased with increasing adsorption temperature, suggesting that the window size of UiO-66 is very similar to the kinetic diameter or critical dimension of Py and that the window size probably is slightly increased with increasing temperature because of lattice vibrations.
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