Abstract
The development of thin layer on hollow-fiber substrate has drawn great attention in the gas-separation process. In this work, polydimethysiloxane (PDMS)/polyetherimide (PEI) hollow-fiber membranes were prepared by using the dip-coating method. The prepared membranes were characterized by Scanning Electron Microscope (SEM), energy-dispersive X-ray spectroscopy (EDX), and gas permeance measurements. The concentration of PDMS solution and coating time revealed an important influence on the gas permeance and the thickness of the PDMS layer. It was confirmed from the SEM and EDX results that the PDMS layer’s thickness and the atomic content of silicon in the selective layer increased with the growth in coating time and the concentration of PDMS solution. The composite hollow-fiber membrane prepared from 15 wt% PDMS solution at 10 min coating time showed the best gas-separation performance with CO2 permeance of 51 GPU and CO2/N2 ideal selectivity of 21.
Highlights
CO2 emission is inevitable owing to the growth of fossil fuel power plants and energyintensive industries [1]
The thickness of PDMS layer was influenced by the concentration
The thickness of PDMS layer was influenced by the concentration of coating solution and the coating time
Summary
CO2 emission is inevitable owing to the growth of fossil fuel power plants and energyintensive industries [1]. The excess of CO2 emission has significantly affected the global warming, sea level rise, and climate changes. Several conventional techniques like amine adsorption, Pressure Swing Adsorption (PSA), and cryogenic distillation are used for CO2 separation [5,6,7]. These processes are energy and cost intensive. Membrane process is an energy efficient technology for CO2 separation [8]. The characteristics of the membrane process, such as simple operation, small footprint, and low cost, make it more competitive than the conventional gas-separation processes [9]
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