Preparation of thin film nanocomposite hollow fiber membranes with polydopamine-encapsulated Engelhard titanosilicate-4 for gas separation applications

Modified Graphene Oxide-Incorporated Thin-Film Composite Hollow Fiber Membranes through Interface Polymerization on Hydrophilic Substrate for CO2 Separation

“…It was also found that in the substrates that contained PEG and DOPA, a C-H stretching vibration peak resulting from PEG at 2875 cm −1 and a broad N-H and -OH peak resulting from DOPA at 3300-3700 cm −1 increased in intensity [39]. In the thin-film composite hollow fiber membranes after interfacial polymerization, a -CONH-peak was observed at 1652 cm −1 , attributed to the polyamide layers formed via In the thin-film composite hollow fiber membranes after interfacial polymerization, a -CONH-peak was observed at 1652 cm −1 , attributed to the polyamide layers formed via crosslinking between the PEI and TMC [22]. Meanwhile, an -OH peak at 3500 cm −1 , a characteristic peak of SDS, had a relatively higher intensity than the original PES.…”

“…Membranes 2021, 11, x FOR PEER REVIEW 9 of 17 crosslinking between the PEI and TMC [22]. Meanwhile, an -OH peak at 3500 cm −1 , a characteristic peak of SDS, had a relatively higher intensity than the original PES.…”

“…Figure 8a shows how the CO2 permeance varied depending on the It was observed that the use of hydrophilic substrate in the IP polymerization dramatically enhanced the gas permeance and selectivity of the resultant interfacially polymerized thin-film hollow fiber membrane. In a previous study, we fabricated membranes of the same type via interfacial polymerization by adding PEI and TMC at the same concentration as in the present study [22]. Surprisingly, the current thin-film hollow fiber membrane specimen (PT), created with the same concentrations of PEI and TMC but different hydrophilic PES substrate incorporated, exhibited CO 2 /N 2 selectivity about seven times higher than the membranes in the previous study under the same experimental conditions (Figure S4).…”

“…Numerous approaches have been reported on developing high-performance membrane materials to overcome this trade-off relationship. Among them, hybrid membranes (e.g., mixed-matrix membranes MMMs or composite mixed-matrix membrane CMMMs) have been recognized as a state-of-the-art way to combine the advantages of a polymer (mechanical flexibility, facile processing, low cost, and easy to scale up) with inorganic fillers (excellent thermo-mechanical stability, high free volume, and selectivity) or incorporating reactivity-selective CO 2 -carrier into the polymer matrices to facilitate the transport of CO 2 [15,[20][21][22].…”

“…Sodium dodecyl sulfate (SDS) surfactant is used to enhance the reactivity of reactant in the IP method and thereafter to enhance the permeance and selectivity of the resultant thin-film composite layer. PEI monomer of Interface polymerization (IP) has been used in this present study as it is a wellestablished method for preparing thin-film composite membranes [22][23][24][25]27]. The IP process has several advantages, such as the formation of ultrathin active thin film, a diversity of monomers, the tunable functional groups, the minimization of defects inside the thin films, and lack of strict requirements for reactant purity [3,23,25,27].…”