title: Adsorption performance of VOCs in ordered mesoporous silicas with different pore structures and surface chemistry.
abstract: Ordered mesoporous silicas with different pore structures, including SBA-15, MCM-41, MCM-48 and KIT-6, were functionalized with phenyltriethoxysilane by a post-synthesis grafting approach. It was found that phenyl groups were covalently anchored onto the surface of mesoporous silicas, and the long-range ordering of the mesoporous channels was well retained after the surface functionalization. The static adsorption of benzene and the dynamic adsorption of single component (benzene) and bicomponent (benzene and cyclohexane) on the original and functionalized materials were investigated. As indicated by the adsorption study, the functionalized silicas exhibit improvement in the surface hydrophobicity and affinity for aromatic compounds as compared with the original silicas. Furthermore, the pore structure and the surface chemistry of materials can significantly influence adsorption performance. A larger pore diameter and cubic pore structure are favorable to surface functionalization and adsorption performance. In particular, the best adsorption performance observed with phenyl-grafted KIT-6 is probably related to the highest degree of surface functionalization, arising from the relatively large mesopores and bi-continuous cubic pore structure which allow great accessibility for the functional groups. In contrast, functionalized MCM-41 exhibits the lowest adsorption efficiency, probably owing to the small size of mesopores and 1D mesoporous channels.
authors.affiliation: Department of Environmental Nano-Materials, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, PR China.
authors.forename: Baojuan
authors.initials: B
authors.lastname: Dou
authors.forename: Qin
authors.initials: Q
authors.lastname: Hu
authors.forename: Jinjun
authors.initials: J
authors.lastname: Li
authors.forename: Shizhang
authors.initials: S
authors.lastname: Qiao
authors.forename: Zhengping
authors.initials: Z
authors.lastname: Hao
mesh_terms: D000327:Adsorption; D001554:Benzene / Q000737:chemistry / Q000302:isolation & purification; D003510:Cyclohexanes / Q000737:chemistry / Q000302:isolation & purification; D046529:Microscopy, Electron, Transmission; D009584:Nitrogen / Q000737:chemistry; D016062:Porosity; D012821:Silanes / Q000737:chemistry; D012822:Silicon Dioxide / Q000737:chemistry*; D017550:Spectroscopy, Fourier Transform Infrared; D013499:Surface Properties; D013816:Thermodynamics; D013818:Thermogravimetry; D055549:Volatile Organic Compounds / Q000302:isolation & purification*; D014961:X-Ray Diffraction
chemical_list: D003510:Cyclohexanes; D012821:Silanes; D055549:Volatile Organic Compounds; C506365:Cyclohexane; D012822:Silicon Dioxide; D001554:Benzene; D009584:Nitrogen; C538884:phenyltriethoxysilane