Second interfacial polymerization of thin‐film composite hollow fibers with amine‐cyclodextrins for pervaporation dehydration

Abstract

High performance thin‐film composite (TFC) hollow fiber membranes have been developed for pervaporation dehydration by second interfacial polymerization (SIP) modification with three kinds of amine‐functionalized β‐cyclodextrin (amine‐CDs), which were synthesized by modifying β‐CD with ammonia, ethylenediamine (EDA), and tris(2‐aminoethyl)amine, respectively. The chemical properties of amine‐CDs and SIP‐modified TFC membranes were characterized by various techniques. The effects of amine‐CD type and SIP parameters (pH or concentration of CD‐EDA solution) were studied systematically to acquire the optimized selective layer of TFC membranes for ethanol dehydration. Among all SIP‐modified TFC membranes, the one with SIP by 2 wt% CD‐EDA aqueous solution (pH = 2) exhibited the most outstanding separation performance with a ultrahigh permeation flux (3,018.0 ± 12.0 g/m2 hr) and permeate concentration (98.7 ± 0.2 wt% water) at 50°C (equivalent to separation factor of 415), contributed by the effectively incorporated CD with rich hydrophilic functional groups and intrinsic nanocavities facilitating the passage of water molecules.

Controllable hydrogen-bonded poly(dimethylsiloxane) (PDMS) membranes for ultrafast alcohol recovery

“…The operation temperature ranges from 40 °C to 80 °C. The pervaporation performance was assessed by total flux ( J , g m −2 h −1 ) and separation factor ( α ) as defined below: 50,51 where w , A , and t refer to the weight of the permeate (g), the effective membrane area (cm 2 ), and the permeation time (h), respectively. x f and y p are the weight fractions of alcohol in feed and permeate, respectively.…”

“…The operation temperature ranges from 40 1C to 80 1C. The pervaporation performance was assessed by total flux (J, g m À2 h À1 ) and separation factor (a) as defined below: 50,51…”

Enhanced pervaporation dehydration performance of polyamide thin‐film composite membrane with sodium alginate hydrophilic surface modification

“…Among the numerous methods for preparing PV membranes, interfacial polymerization (IP) is an effective method for fabricating the thin and defect-free thin-film composite (TFC) membranes, which is produced by a rapid reaction between the aqueous and organic phase monomer at the interface. [5][6][7] The physical and chemical properties of the monomer could significantly influence the morphological structure of the final polyamide layer. The researchers have found that amine-rich aqueous monomer fabricated dense polyamide (PA) layer with better performance for dehydration, which facilitate the diffusion of water molecules in PV membranes.…”

“…Among the numerous methods for preparing PV membranes, interfacial polymerization (IP) is an effective method for fabricating the thin and defect‐free thin‐film composite (TFC) membranes, which is produced by a rapid reaction between the aqueous and organic phase monomer at the interface 5–7 . The physical and chemical properties of the monomer could significantly influence the morphological structure of the final polyamide layer.…”