Silylated Mesoporous Silica Membranes on Polymeric Hollow Fiber Supports: Synthesis and Permeation Properties

被引:18
|
作者
Kim, Hyung-Ju [1 ]
Brunelli, Nicholas A. [1 ]
Brown, Andrew J. [2 ]
Jang, Kwang-Suk [1 ]
Kim, Wun-gwi [1 ]
Rashidi, Fereshteh [1 ]
Johnson, Justin R. [1 ]
Koros, William J. [1 ]
Jones, Christopher W. [1 ,2 ]
Nair, Sankar [1 ]
机构
[1] Georgia Inst Technol, Sch Chem & Biomol Engn, Atlanta, GA 30332 USA
[2] Georgia Inst Technol, Sch Chem & Biochem, Atlanta, GA 30332 USA
关键词
mesoporous silica; membrane; hollow fiber; silylation; organics/water separation; MCM-48; MEMBRANES; ZEOLITE MEMBRANE; HIGH-FLUX; PERVAPORATION MEMBRANES; ORGANIC/WATER MIXTURES; SEPARATION PROPERTIES; TUBULAR MEMBRANES; GAS SEPARATION; WATER; ETHANOL;
D O I
10.1021/am504581j
中图分类号
TB3 [工程材料学];
学科分类号
0805 ; 080502 ;
摘要
We report the synthesis and organic/water separation properties of mesoporous silica membranes, supported on low-cost and scalable polymeric (polyamide-imide) hollow fibers, and modified by trimethylsilylation with hexamethyldisilazane. Thin (similar to 1 mu m) defect-free membranes are prepared, with high room-temperature gas permeances (e.g., 20 000 GPU for N2). The membrane morphology is characterized by multiple techniques, including SEM, TEM, XRD, and FT-ATR spectroscopy. Silylation leads to capping of the surface silanol groups in the mesopores with trimethylsilyl groups, and does not affect the integrity of the mesoporous silica structure and the underlying hollow fiber. The silylated membranes are evaluated for pervaporative separation of ethanol (EtOH), methylethyl ketone (MEK), ethyl acetate (EA), iso-butanol (i-BuOH), and n-butanol (n-BuOH) from their dilute (5 wt %) aqueous solutions. The membranes show separation factors in the range of 4-90 and high organic fluxes in the range of 0.18-2.15 kg m(-2) h(-1) at 303 K. The intrinsic selectivities (organic/water permeability ratios) of the silylated membranes at 303 K are 0.33 (EtOH/water), 0.5 (MEK/water), 0.25 (EA/water), 1.25 (i-BuOH/water), and 1.67 (n-BuOH/water) respectively, in comparison to 0.05, 0.015, 0.005, 0.08, and 0.14 for the unmodified membranes. The silylated membranes allow upgradation of water/organics feeds to permeate streams with considerably higher organics content. The selective and high-flux separation is attributed to both the organophilic nature of the modified mesopores and the large effective pore size. Comparison with other organics/water separation membranes reveals that the present membranes show promise due to high flux, use of scalable and low-cost supports, and good separation factors that can be further enhanced by tailoring the mesopore silylation chemistry.
引用
收藏
页码:17877 / 17886
页数:10
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