Effects of shape, porosity, and operating parameters on carbon dioxide recovery in polytetrafluoroethylene membranes

Hydrophobic fluorocarbon-modified silica aerogel tubular membranes with excellent CO2 recovery ability in membrane contactors

“…As a result, CO 2 gases pass through the membrane pore and are absorbed by the aqueous amine solution. As a result, a variety of hydrophobic polymeric membranes, such as polypropylene (PP) [1][2][3][4], polyphenylsulfone [5], polyvinylidene difluoride (PVDF) [6,7] and polytetrafluoroethylene (PTFE) [8,9], have been used in membrane contactors for CO 2 capture. However, these polymeric membranes are easily swelled by the aqueous amine solution to change their surface morphology and roughness, leading to a decrease in the CO 2 absorption capacity.…”

Reusable fluorocarbon-modified electrospun PDMS/PVDF nanofibrous membranes with excellent CO 2 absorption performance

“…10. The CO 2 absorption flux of the FAS-modified PDMS/PVDF nanofibrous membranes was able to be continuously maintained at a stable value over 300 min, at approximately 1.5 mmol/m 2 s, for at least four days, which is higher than the CO 2 absorption fluxes reported for other membranes such as polypropylene (PP) (1.0 mmol/m 2 s) [26], polyvinylidene fluoride (PVDF) (1.2 mmol/m 2 s) [27], polytetrafluoroethylene (PTFE) (1.0 mmol/m 2 s) [30], SiO 2 aerogel (0.8-1.2 mmol/m 2 s) [24,25,31] and PVDF/SiO 2 nanofibrous membranes (1.2 mmol/ m 2 s) [44]. Furthermore, the reusability of the PDMS/PVDF membranes submitted to four FAS modifications is also illustrated by the results of three one-day cycles shown in Fig.…”

“…2.0 g of PVDF was added to 8.0 g of a dimethylformamide (DMF) solution, and a homogenous solution was formed after heating to 60°C for 12 h. The solution was then ejected into an electrospinning capillary at different voltages (20,25,30 prepared FAS/n-hexane solution at 40°C for 24 h, and the FAS solution was refreshed every 24 h (1, 2, 3 or 4 modifications).…”

“…The CO 2 absorption fluxes will be reduced if the membranes are wetted by aqueous amine absorbents due to the increase in mass transfer resistance. As a result, hydrophobic polymeric membranes such as polypropylene (PP) [26], polyvinylidene fluoride (PVDF) [27][28][29] and polytetrafluoroethylene (PTFE) [30] have been used in membrane contactors for CO 2 capture to prevent membrane wetting. However, polymeric membranes are easily swelled and wetted by aqueous amine absorbents, decreasing the CO 2 absorption capacity of the corresponding membrane contactors.…”

Polyvinylidene Fluoride/Siloxane Nanofibrous Membranes for Long‐Term Continuous CO2‐Capture with Large Absorption‐Flux Enhancement

“…[20] Thus, the hydrophobic membrane is the most important constituent in membrane contactor systems used for CO 2 capture. Hydrophobic polymeric membranes, such as polytetrafluoroethylene (PTFE), [50] polypropylene (PP), [51] and polyvinylidene fluoride (PVDF), [52] have been used in membrane contactors for CO 2 capture. However, the use of polymeric membranes in a membrane contactor system changes the surface morphology and roughness of the membrane, resulting in the wetting of the membranes after contact with the aqueous amine absorbents [53] and a reduction in CO 2 absorption.…”