Zeolite ZSM5-Filled PVDF Hollow Fiber Mixed Matrix Membranes for Efficient Carbon Dioxide Removal via Membrane Contactor

Abstract

ZSM5 zeolite-filled PVDF mixed matrix membranes (MMMs) were wet spun and used for CO2 absorption in a contactor system. The properties of ZSM5 were analytically characterized. SEM images revealed the fully asymmetric structure of membranes, in which the creation of finger-like macrovoids was promoted with increasing filler loading. A significant increase in gas permeance was observed, which was associated with the porosity increase of the membrane surface despite the decrease in surface pore size. The surface roughness, wettability resistance, and mechanical stability of membranes were also considerably improved by filler loading. A CO2 absorption test with water revealed a higher CO2 flux of MMMs than that of the plain membrane. Peak absorption flux of 5.80 × 10–3 mol m–2 s–1 was achieved at a liquid velocity of 1.2 m s–1 for 5 wt % ZSM5/PVDF membrane (MZ5), which was nearly 177% higher than that of neat PVDF and also surpassed that of several commercial and in-house made membranes. The mass transfer resistance of the MMMs was also considerably lower than that of PVDF.

Nanocomposite Membranes for Liquid and Gas Separations from the Perspective of Nanostructure Dimensions

“…3D nanomaterials with rigid cage-like structure offer some structural advantages that are important for a gas-separation nanocomposite membrane. The last decade has witnessed tremendous efforts in developing MMM gas separation membranes based on 3D zeolite [ 102 , 103 , 104 ], MOF [ 105 , 106 , 107 ] and POSS [ 108 , 109 , 110 ]. In particular, MOFs exhibit a strong affinity towards CO 2 molecules and are able to enhance CO 2 solubility in the membrane hence offering excellent CO 2 separation performance [ 111 , 112 ].…”

CO2 Absorption Using Membrane Contactors: Recent Progress and Future Perspective

“…It has been shown that the CO 2 flux remained stable for 31 days of continuous operation owing to the hydrophobicity rendered by fSiO 2 particles . Besides the utilization of fSiO 2 , ,, other inorganic materials, such as CaCO 3 , cloisite, , montmorillonite (MMT), , zeolite (ZSM-5), and TiO 2 , have also been explored to fabricate inorganic–organic hybrid membranes for applications in membrane contactors.…”

Superhydrophobic Surface-Constructed Membrane Contactor with Hierarchical Lotus-Leaf-Like Interfaces for Efficient SO2 Capture

“…The massive emissions of sulfur dioxide (SO 2 ) have adverse influences on the ecological environment and human health. − In past decades, numerous researches have been focused on the absorption of SO 2 gas by employing gas–liquid membrane contactor technology, which displays the green and efficient industrial application prospect, avoiding the flooding, bubbling, gas–liquid entrainment problems. − The investigation of acidic gas capture by membrane contactor can be classified into various categories: membrane design, , transfer mechanism, , absorption liquid, optimized operating process, , process simulation, etc. , To obtain the excellent acid gas absorption flux, a membrane contactor designed with a hydrophobic property is essential to keep absorbent liquid from immersing into the pores of membrane contactors. − Therefore, a hydrophobic membrane material, such as polytetrafluoroethylene (PTFE), polypropylene (PP), has been used to prepare porous membrane contactors for desulfurization. − …”

“…Polyvinylidene fluoride (PVDF) as a polymer matrix can be fabricated by the simple non-solvent-induced phase separation (NIPS) strategy, and pore sizes, distributions of pore size, and porosities are precisely tuned by membrane forming processes. ,, The performances can be evaluated by incorporating various particles. Zhang et.al prepared 4A@Cu as fillers and incorporated them into the PVDF matrix for fabrication of membrane contactors .…”

“…Recently, inorganic fillers have been incorporated into the polymer matrix for acid gas removal, 35,36 and inorganic particles in the membrane contactor show potential in combining the merits of the organic membrane contactor and inorganic membrane contactor such as excellent absorption fluxes, wetting resistances, and long-term stabilities. 21 Leo et al 37 incorporated SAPO-34 and POSS into the PVDF matrix and constructed pathways for gas diffusions, which improved gas absorption flux. In particular, the blending of functionalized POSS into the polymer membrane improved the acid gas absorption flux, which was more than two times higher than the control membrane.…”