Figure 1

Schematic diagram of the preparation of GO-IL SPE column.
Graphene oxide were reacted with [AEMIM][Br] to synthesize the GO-[AEMIM][Br] composite. And GO and GO-[AEMIM][Br] were packed into a syringe filter (0.45 μm, hydrophobic polytetrafluoroethylene membrane) respectively. In contrast to GO-ILs columns, GO column is easily broken during perfusion which is attributed to the high column pressure.