title: Adsorption of volatile organic compounds by metal-organic frameworks MIL-101: influence of molecular size and shape.
abstract: 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.
authors.affiliation: Department of Environmental Science, Zhejiang University, Hangzhou 310058, China. kyang@zju.edu.cn
authors.forename: Kun
authors.initials: K
authors.lastname: Yang
authors.forename: Qian
authors.initials: Q
authors.lastname: Sun
authors.forename: Feng
authors.initials: F
authors.lastname: Xue
authors.forename: Daohui
authors.initials: D
authors.lastname: Lin
mesh_terms: D000327:Adsorption; D008670:Metals / Q000737:chemistry*; D046529:Microscopy, Electron, Transmission; D008970:Molecular Weight; D055549:Volatile Organic Compounds / Q000737:chemistry*; D014961:X-Ray Diffraction
chemical_list: D008670:Metals; D055549:Volatile Organic Compounds