Contact
    Start Publications Mesoporous Silica Membranes Silylated by Fluorinated and ...
    ←  Publication Finder
    KSV NIMA

    Mesoporous Silica Membranes Silylated by Fluorinated and Non-Fluorinated Alkylsilanes for the Separation of Methyl Tert-Butyl Ether from Water

    Year: 2020

    Journal: Membranes, Volume 10, APR

    Authors: Wang, ZJ; Hao, LW; Yang, FH; Wei, Q

    Organizations: National Key Research and Development Program of China [2017YFB0603601-03]; National Natural Science Foundation of ChinaNational Natural Science Foundation of China (NSFC) [21171014]; State Key Laboratory of Solid Waste Reuse for Building Materials [SWR-2014-010]

    Keywords: silica membrane; fluorinated; nonfluorinated alkylsilane; silylation; post-grafting; hydrophobicity; pervaporation; methyl tert-butyl ether

    It is of great significance to separate hazardous methyl tert-butyl ether (MTBE) from water in terms of environmental protection and human health. In the present work, alpha-Al2O3-suppotred silica membranes were prepared by the sol-gel and dip-coating technique. Two fluorinated alkylsilanes (1H,1H,2H,2H-perfluorooctyltriethoxysilane (PFOTES) and trifluoropropyltriethoxysilane (TFPTES)) and two non-fluorinated alkylsilanes (octyltriethoxysilane (OTES) and propyltriethoxysilane (PTES)) were adopted to silylate the silica membrane by the post-grafting method which is used for the separation of MTBE from water by pervaporation. The results show that silylation enhances the hydrophobicity of silica membranes. The silylated silica membranes are selective towards MTBE, and the MTBE/water separation factor varies with grafting agents in the order: PFOTES > TFPTES > OTES > PTES. Membranes silylated with fluorinated carbon chains seem to be more selective towards MTBE than those with non-fluorinated carbon chains. The total flux is proportional to the pore volume of silica membranes, which depends on grafting agents in the order: PTES > PFOTES > OTES > TFPTES. Considering both total flux and selectivity, the PFOTES-SiO2 membrane is most effective in separation, with a MTBE/water separation factor of 24.6 and a total flux of 0.35 kg m(-2) h(-1) under a MTBE concentration of 3.0% and a feed temperature of 30 degrees C.
    View publication