Polymer Testing, Volume (56), No (1), Year (2016-10) , Pages (287-298)

Title : ( Using PDMS coated TFC-RO membranes for CO2/N2 gas separation: Experimental study, modeling and optimization )

Authors: Mohammad Reza Moradi , Mahdi Pourafshari Chenar , Seyed Hossein Noie Baghban ,
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Thin film composite (TFC) reverse osmosis (RO) membranes are semipermeable membranes that are utilized in water purification or water desalination systems. Discarding these membranes after end-oflife leads to environmental problems. Reusing old TFC-RO membranes is one way to solve this problem. For this reason, in this study, used TFC-RO membranes were coated with polydimethylsiloxane (PDMS) for CO2/N2 gas separation application. Attenuated total reflectance Fourier transform infrared spectroscopy (ATR-FTIR) was utilized to confirm the crosslinking of coated PDMS. The morphology of PDMS/TFC-RO membranes was characterized using scanning electron microscopy (SEM). The parameters that can affect performance of prepared membranes (N2 permeance and CO2/N2 selectivity) are concentration of PDMS solution, coating time, solvent evaporation time and curing temperature and time. Given that the used membranes don't have uniform surfaces, the first step of this study was to investigate the effect of the above mentioned factors on virgin membranes using fractional factorial design (FFD) of experiments. The results obtained showed that PDMS concentration is the most significant factor that has a negative effect on N2 permeance and positive effect on CO2/N2 selectivity. The reported CO2/N2 selectivity of PDMS membranes was 11e12, but this selectivity for prepared PDMS/TFC-RO membranes was in the range of 6.7e22.5. After determining optimum conditions, the gas separation performance of PDMS coated used TFC-RO membrane under these conditions was finally determined. The results showed that the used membranes had a better performance than virgin membranes.

Keywords

, PDMS, coated TFC, RO membrane; Permeance; Gas separation; Nitrogen; Carbon
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@article{paperid:1059019,
author = {Moradi, Mohammad Reza and Pourafshari Chenar, Mahdi and Noie Baghban, Seyed Hossein},
title = {Using PDMS coated TFC-RO membranes for CO2/N2 gas separation: Experimental study, modeling and optimization},
journal = {Polymer Testing},
year = {2016},
volume = {56},
number = {1},
month = {October},
issn = {0142-9418},
pages = {287--298},
numpages = {11},
keywords = {PDMS-coated TFC-RO membrane; Permeance; Gas separation; Nitrogen; Carbon dioxide.},
}

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%0 Journal Article
%T Using PDMS coated TFC-RO membranes for CO2/N2 gas separation: Experimental study, modeling and optimization
%A Moradi, Mohammad Reza
%A Pourafshari Chenar, Mahdi
%A Noie Baghban, Seyed Hossein
%J Polymer Testing
%@ 0142-9418
%D 2016

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