Fabrication of Polydimethysiloxane (PDMS) Dense Layer on Polyetherimide (PEI) Hollow Fiber Support for the Efficient CO2/N2 Separation Membranes

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.

Impact of dope extrusion rate and multilayer polydimethylsiloxane coating on asymmetric polyethersulfone hollow fiber membrane for CO2/N2 and CO2/CH4 separation

“…Although, the gas permeance of M2 membrane is slightly higher than M1 membrane owing to the fact that M2 has much more pinhole defect as compared to M1. Our findings were also in line with study conducted by Li et al 45 in which increasing the number of PDMS coatings increased PDMS layer thickness, which resulted in reduced gas permeance. Roslan et al 3 also observed similar trend in their study.…”

Thin Film Mixed Matrix Hollow Fiber Membrane Fabricated by Incorporation of Amine Functionalized Metal-Organic Framework for CO2/N2 Separation

“…The gas flow rate was measured by using a bubble flow meter (Sigma Aldrich, Poznań, Poland). The permeances (P/d) of gases were calculated by using Equation (1) [ 7 , 8 ]: where P is the permeability (Barrer); Q is the flux of gas permeation rate (cm 3 (STP)/s); d is the thickness of membrane selective layer (cm); A is the effective membrane area (cm 2 ); Δp is the pressure difference across the membrane (cmHg); r is the outer radius (cm) of hollow fiber; n is the number of hollow fibers; P/d is the gas permeance expressed in GPU (1 GPU = 10 −6 cm 3 (STP) cm −2 s −1 cmHg −1 ).…”

“…Membrane separation technology is widely considered as an alternative to the traditional intensively energy-consuming technologies for CO 2 separation [ 6 ]. Various types of membrane have been used for CO 2 capture from flue gas mixture, such as polymeric membranes [ 7 , 8 ], inorganic membranes [ 9 ], and mixed matrix membranes (MMMs) [ 10 , 11 , 12 ].…”

State-of-the-Art Organic- and Inorganic-Based Hollow Fiber Membranes in Liquid and Gas Applications: Looking Back and Beyond

“…A surge of interest in developing polymeric hollow fiber membranes has been witnessed in the past few decades. Examples of polymers reported include polysulfone (PSF) [ 80 , 81 , 82 , 83 ], polyethersulfone (PES) [ 84 , 85 , 86 , 87 ], cellulose acetate [ 88 , 89 , 90 ], polyimide [ 91 , 92 , 93 , 94 ], polyetherimide [ 95 , 96 , 97 , 98 ], polycarbonate (PC) [ 99 , 100 ], polyvinylidene fluoride (PVDF) [ 83 , 86 , 101 , 102 , 103 , 104 , 105 , 106 , 107 ], and polybenzimidazole (PBI) [ 108 , 109 ]. The fabrication of polymeric hollow fiber membranes follows the common practice mentioned previously, which often includes a post-treatment such as silicon rubber coating to seal the defects on hollow fiber membranes for superior separation performance [ 110 ].…”