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Research Papers

Synthesis and Characterization of Novel Modified SBA-15/PSF Nanocomposite Membrane Coated by PDMS for Gas Separation

[+] Author and Article Information
A. Jomekian

Department of Chemical Engineering, Faculty of Engineering, Ferdowsi University of Mashhad, Mashhad 91775-1111, Iranabolfazl.jomekian@gmail.com

M. Pakizeh

Department of Chemical Engineering, Faculty of Engineering, Ferdowsi University of Mashhad, Mashhad 91775-1111, Iranpakizeh@um.ac.ir

M. Poorafshari

Department of Chemical Engineering, Faculty of Engineering, Ferdowsi University of Mashhad, Mashhad 91775-1111, Iranpoorafshari@um.ac.ir

S. A. A. Mansoori

Department of Chemical Engineering, Faculty of Engineering, Ferdowsi University of Mashhad, Mashhad 91775-1111, Iranbidad_kavir@yahoo.com

J. Nanotechnol. Eng. Med 2(2), 021003 (May 13, 2011) (9 pages) doi:10.1115/1.4003862 History: Received December 20, 2010; Revised March 02, 2011; Published May 13, 2011; Online May 13, 2011

SBA-15 nanoparticles were prepared by in situ assembly of inorganic precursors and CTAB. The structure of nanoparticles was characterized by X-ray diffraction, transmission electron microscopy, particle size analysis, and N2 adsorption techniques. The surface modification of particles in order to perfect dispersion in PSF matrix was performed by DMDCS and APTMS as new modification agents. Thermogravimetric analysis and scanning electron microscopy analysis were applied to investigate thermal stability and quality of distribution of particle in the nanocomposite membrane, respectively. The PDMS was used to coat the possible defects of synthesized membranes. For all gases (N2, CO2, CH4, and O2), the permeance of uncoated DMDCS modified SBA-15/PSF (20 wt %) raised from 16 to 31.6, 0.47–0.99, 0.45–1.1 and 2.75–5.33 for CO2, N2, CH4, and O2, respectively in comparison with PSF. The corresponding values of CO2, N2, CH4, and O2 permeances through uncoated APTMS modified SBA-15/PSF (20 wt %) enhanced to 29.12, 0.8, 0.85, and 4.75 respectively, compared with neat PSF membrane. The ideal selectivities of CO2/CH4 and O2/N2 for DMDCS modified SBA-15 (20 wt %) nanocomposite membranes coated by 30 wt % PDMS solution enhanced from 26 to 35 and from 5.4 to 7.1, respectively. Using APTMS as modification agent resulted in higher selectivity of CO2/CH4 (38.2) and O2/N2 (7.2) than those of DMDCS modified. The measured actual selectivities of CO2/CH4 and O2/N2 and permeances of all gases tested are a few amounts lower than ideal selectivities and permeances of gases in single gas permeation tests but are still much higher than those for pure PSF.

Copyright © 2011 by American Society of Mechanical Engineers
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References

Figures

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Figure 1

Silylation and amine treatment of SBA-15 nanoparticles

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Figure 2

The single gas permeation experimental setup

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Figure 3

Schematic view of the dead-end membrane module

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Figure 4

Experimental setup for mixed gas separation

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Figure 5

XRD pattern of SBA-15 particles

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Figure 6

The particle size distribution of SBA-15 nanoparticles

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Figure 7

The N2 adsorption-desorption isotherms of SBA-15 particles at 77 K

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Figure 8

The pore size distribution of SBA-15 particles

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Figure 9

The TEM image of SBA-15 particles

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Figure 10

SEM images of (a) unmodified and (b) DMDCS modified SBA-15/PSF composite membrane

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Figure 11

TGA thermodiagrams of SBA-15/PSF composite membranes with different SBA-15 loading

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Figure 12

SEM photographs of the surface of SBA-15/PSF composite membranes coated with different PDMS solution concentrations: (a) 1 wt %, (b) 5 wt %, (c) 7 wt %, and (d) 30 wt %

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Figure 13

Measured selectivities for 30 wt % PDMS coated DMDCS modified membranes with different loadings of SBA-15 in PSF matrix at 4 bars and 298 K using 50-50 vol % O2–N2 and CO2–CH4 gas mixtures, respectively

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Figure 14

Measured selectivities for 30 wt % PDMS coated APTMS modified membranes with different loadings of SBA-15 in PSF matrix at 4 bars and 298 K using 50-50 vol % O2–N2 and CO2–CH4 gas mixtures, respectively

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Figure 15

Measured permeances (GPU) for 30 wt % PDMS coated DMDCS modified membranes with different loadings of SBA-15 in PSF matrix at 4 bars and 298 K using a mixture that contained 25 vol % of each gas

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Figure 16

Measured permeances (GPU) for 30 wt % PDMS coated APTMS modified membranes with different loadings of SBA-15 in PSF matrix at 4 bars and 298 K using a mixture that contained 25 vol % of each gas

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