| 초록 |
In this study, we developed a functionalized nanoporous graphene (FNG) membrane to alleviate the typical issues of graphene-based membranes, such as the low water flux and poor stability in aqueous solvents. Nanoporous graphene (NG) was prepared by thermally annealing graphene oxide (GO) at 650 ℃, leading a turbostratic and amorphous structure with nanopores below 4 nm. Following, the NG was partially oxidized by KMnO4 treatment to disperse nanoporous graphene in water. The membrane exhibited high water permeance of 586 Lm-2h-1bar-1 and low molecular weight cut off (MWCO) of 269 Da, surpassing the upper bound of reported polymers and 2D materials-based nanofiltration membranes. In addition, the FNG membrane is highly stable under the cross-flow filtration, and the decline of water flux is suppressed by the abundant nanopores on the basal plane of graphene compared to normal GO membranes during the practical long-term filtration. |
