Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
11027995 | Journal of Membrane Science | 2018 | 23 Pages |
Abstract
Manipulating the chemical structure of GO interlayer channels is an efficient strategy to improve the selective molecular transport through the resultant GO membrane. In this work, PEGylation of GO membrane was performed to incorporate hydrophilic ether bonds into the interlayer channels in GO membrane for efficient separation of ethanol and water mixtures via pervaporation. Poly(ethylene glycol) diamines (PEGDA) was adopted as the intercalation molecule to covalently bond with GO through the reaction between amine and epoxy groups. Numerous ether bonds increase membrane hydrophilicity and promote water adsorption, while the covalent cross-linking confers the membrane robustness for operation, thus achieving an increase in separation factor and stability. On this basis, highly hydrophilic sodium alginate (SA) was then coated on the surface of PEGDA-GO composite membrane to further strengthen the adsorption of water molecules on the membrane surface. Compared with pristine graphene, the SA/PEGDA-GO membrane shows a concurrent enhancement in the permeation flux and separation factor. The sodium alginate coated PEGylated GO composite membrane possesses an exceptional pervaporation performance with the permeation flux of 3595â¯gâ¯mâ2 hâ1 and water purity in permeate of 98.5% under the conditions of 70â¯Â°C and water concentration in feed of 20â¯wt%. The membrane performance remains stable during a long-term operation test for 120â¯h at 70â¯Â°C.
Related Topics
Physical Sciences and Engineering
Chemical Engineering
Filtration and Separation
Authors
Di Zhao, Jing Zhao, Yufan Ji, Gongping Liu, Shaomin Liu, Wanqin Jin,