Journal
ACS SUSTAINABLE CHEMISTRY & ENGINEERING
Volume 3, Issue 9, Pages 1925-1933Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acssuschemeng.5b00435
Keywords
Cyclodextrin; Thin film nanocomposite membrane; Intafacial polymerization; Tunable solvent permeation properties; Organic solvent nanofiltration
Categories
Funding
- National Natural Science Foundation of China [21206151, U1407121]
- China Postdoctoral Science Foundation [2014T70687]
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Design and fabrication of thin film nanocomposite (TFN) membranes with tunable solvent permeation properties is highly required to meet the demands of practical applications. Herein, a series of TFN membranes are elaborately fabricated by embedding cydodextrins (CDs) into hydrophilic polymeric membrane (e.g., polyethylenimine, PEI). Within the active layer, hydrophobic cavities of CDs serve as exquisite pathways for nonpolar solvents, whereas the free volume cavities of the PEI matrix act as efficient pathways for polar solvents, constructing a dual-pathway nanostructure. The solvent permeation properties of these two pathways can be accurately tuned by adjusting the cavity size of CD and the fractional free volume (FFV) of PEI. Increasing the cavity size of CD allows larger nonpolar solvent to permeate, meanwhile increasing solvent flux. For instance, varying the cavity size from 0.60 to 0.75 nm elevates the toluene (0.60 nm) permeance from 0.13 to 2.52 L m(-2) h(-1) bar(-1). Similar behaviors are observed for polar solvents when increasing the FFV of PEI by adjusting the PEI CD interfacial interactions. Particularly, the isopropyl alcohol permeance is elevated from 3.37 to 4.16 L m(-2) h(-1) bar(-1) when increasing FFV from rejection ability and extended trial of TFN membranes are also explored.
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