Fabrication of graphene oxide composite membranes and their application for pervaporation dehydration of butanol

As a new kind of 2D nanomaterials, graphene oxide (GO) with 2–4 layers was fabricated via a modified Hummers method and used for the preparation of pervaporation (PV) membranes. Such GO membranes were prepared via a facile vacuum-assisted method on anodic aluminium oxide disks and applied for the dehydration of butanol. To obtain GO membranes with high performance, effects of pre-treatments, including high-speed centrifugal treatment of GO dispersion and thermal treatment of GO membranes, were investigated. In addition, effects of operation conditions on the performance of GO membranes in the PV process and the stability of GO membranes were also studied. It is of benefit to improve the selectivity of GO membrane by pre-treatment that centrifuges the GO dispersion with 10000 r·min− 1 for 40 min, which could purify the GO dispersion by removing the large size GO sheets. As prepared GO membrane showed high separation performance for the butanol/water system. The separation factor was 230, and the permeability was as high as 3.1 kg·m− 2·h− 1 when the PV temperature was 50 °C and the water content in feed was 10% (by mass). Meanwhile, the membrane still showed good stability for the dehydration of butanol after running for 1800 min in the PV process. GO membranes are suitable candidates for butanol dehydration via PV process.

A graphene oxide (GO) membrane was prepared on ceramic disk via a vacuum-assisted filter method. The GO membrane with a typical 2D structure exhibits selective water permeation due to the hydrophilic groups on GO sheets. The ceramic supported GO membrane with submicron thickness and enhanced mechanical strength was applied for the pervaporation dehydration of butanol. The GO membrane showed a high permeate of 3.1 kg·m− 2·h− 1 and a separation factor of 230 at the conditions with a PV temperature of 50 °C and a feed water content of 10% (by mass). After running for 1800 min, the GO membrane still showed a good stability. Such GO membranes are potential candidates for the dehydration of butanol.Figure optionsDownload as PowerPoint slide