Journal
APPLIED CATALYSIS B-ENVIRONMENTAL
Volume 129, Issue -, Pages 123-129Publisher
ELSEVIER
DOI: 10.1016/j.apcatb.2012.09.020
Keywords
Acid base interaction; Adsorptive denitrogenation; Functionalization; Metal organic framework (MOF)
Funding
- National Research Foundation of Korea (NRF)
- Ministry of Education, Science and Technology [2012004528]
- Kyungpook National University
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To understand the effect of the acidity or basicity of porous metal-organic frameworks (MOFs) on the adsorptive removal of nitrogen-containing compounds (NCCs), an MOF (MIL-100(Cr)) was modified to impart acidity or basicity onto the MOFs. The modification was done by grafting ethylenediamine and aminomethanesulfonic acid onto coordinatively unsaturated sites of the MOF, MIL-100(Cr). The adsorptive removal of a basic quinoline or benzothiophene can be improved noticeably, especially at low concentrations, with the introduction of an acidic site: however, a basic MOF causes a severe decrease in the adsorptive performance for a basic adsorbate such as quinoline. The effect of the interaction of the base-base on adsorption was more severe or detrimental for a hard base quinoline than for a soft base benzothiophene. Functionalized MOFs show a slightly decreased adsorption for a neutral adsorbate such as indole probably because of the decreased porosity of the MOFs compared with the virgin MOF without functionalization. Moreover, a functionalized MOF (with -SO3H group) can be used several times after simple washing with acetone. From the present research, it may be concluded that acid-base interactions between NCCs and MOFs will lead to favorable adsorptive removal of NCCs. However, for the adsorptive removal of a neutral adsorbate such as indole, another adsorption mechanism (such as pi-complexation or hydrogen-bonding) is needed for high uptake and efficient removal. (C) 2012 Elsevier B.V. All rights reserved.
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