Adsorption of volatile organic compounds by metal–organic frameworks MIL-101: Influence of molecular size and shape

► A porous adsorbent, MIL-101, having huge Langmuir surface area of 5870 m 2/g and pore volume of 1.85 cm 3/g, was synthesized. ► We observed that MIL-101 is a potential superior adsorbent for the sorptive removal of VOCs. ► Adsorption of VOCs on MIL-101 is captured by a pore filling mechanism, show...

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Bibliographic Details
Published in:	Journal of hazardous materials 2011-11, Vol.195, p.124-131
Main Authors:	Yang, Kun, Sun, Qian, Xue, Feng, Lin, Daohui
Format:	Article
Language:	eng
Subjects:	Acetone activated carbon Adsorbents Adsorption Applied sciences Benzene Chemical engineering Exact sciences and technology Metal-organic frameworks Metals - chemistry Microscopy, Electron, Transmission MIL-101 Molecular Weight Planes Pollution Porosity surface area Surface chemistry toluene VOCs Volatile organic compounds Volatile Organic Compounds - chemistry X-Ray Diffraction xylene zeolites
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Summary:	► A porous adsorbent, MIL-101, having huge Langmuir surface area of 5870 m 2/g and pore volume of 1.85 cm 3/g, was synthesized. ► We observed that MIL-101 is a potential superior adsorbent for the sorptive removal of VOCs. ► Adsorption of VOCs on MIL-101 is captured by a pore filling mechanism, showing the size and shape selectivity of molecules. ► There is a negative linear relationship between the volume adsorption capacity of VOCs and their molecular cross-sectional area. ► The size and shape selectivity of VOC molecules into MIL-101 pores is important in the application of MIL-101 as VOC adsorbent. Adsorption of gaseous volatile organic compounds (VOCs) on metal–organic frameworks MIL-101, a novel porous adsorbent with extremely large Langmuir surface area of 5870 m 2/g and pore volume of 1.85 cm 3/g, and the influence of VOC molecular size and shape on adsorption were investigated in this study. We observed that MIL-101 is a potential superior adsorbent for the sorptive removal of VOCs including polar acetone and nonpolar benzene, toluene, ethylbeznene, and xylenes. MIL-101 is of higher adsorption capacities for all selected VOCs than zeolite, activated carbon and other reported adsorbents. Adsorption of VOCs on MIL-101 is captured by a pore filling mechanism, showing the size and shape selectivity of VOC molecules. These prove to be a negative linear relationship between the volume adsorption capacities of VOCs and their molecular cross-sectional area values. Most VOC molecules, such as acetone, benzene, toluene, ethylbenzene and p-xylene, enter into MIL-101 pores with the planes having the minimum diameters. However, m-xylene and o-xylene may fill into the pores with the planes having the maximum diameters because of the preferred interaction of MIL-101 with the two methyl groups of adsorbate molecules.
ISSN:	0304-3894 1873-3336