Journal
CHEMICAL ENGINEERING JOURNAL
Volume 307, Issue -, Pages 1116-1126Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.cej.2016.09.012
Keywords
Toluene; Hydrogen bonding; Surface barrier; Physisorption; UiO-66(NH2)
Categories
Funding
- National Research Foundation of Korea (NRF) - Ministry of Education, Science and Technology (MEST) [2006-0093848]
- Cooperative Research Program for Agriculture Science & Technology Development (Project title: Study on model development to control odor from hog barn), Rural Development Administration, Republic of Korea [PJ010521]
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Enormous efforts have been put to effectively treat or eliminate toluene, one of the most well-known volatile organic compounds (VOCs). Herein, we report its sorptive removal mechanism against metal organic frameworks (MOFs: UiO-66, UiO-66(NH2), ZIF-67, MOF-199, MOF-5, and MIL-101(Fe)) under ambient conditions. Their interactions were assessed by the Henry's law constant (K-H) and the heat of adsorption (Delta H-ads). Although the equilibrated adsorption capacities of all MOFs were measured from 159 (MOF-199) to 252 mg g(-1) (UiO-66(NH2)), those values were reduced considerably with increases in humidity and temperature. Among them, the sorption pattern of UiO-66(NH2) was the most reproducible when tested over a three cycle (147 (1st) and 133 mg g(-1) (3rd cycle)). The behavior of -NH terminated MOFs (UiO-66(NH2) and ZIF-67) was distinguished with those of -COOH as explained by a scheme of hypothetical potential energy profiles using mass transfer resistance and surface barrier phenomena. (C) 2016 Elsevier B.V. All rights reserved.
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