Fabrication of Robust GO Composite Membranes through Novel Polyether Ether Ketone Weaving Strategies for Organic Solvent Nanofiltration

Fabrication of crystalline, robust graphene oxide (GO) OSN membranes is promising yet highly challenging. Herein, we prepare a SPEEK@GO/PEEK solvent-resistant composite membrane by novel weaving strategies. Among the process, SPEEK is seen as the "line", repaired of broken small pieces of GO. This facile weaving can significantly improve the separation performance and the whole stability of the membrane and effectively remove small dyes in organic solvents. The stable composite membrane exhibited excellent performance and high solvent permeance for organic solvents (DMF, 22.71 L·m-2·h-1·bar-1; acetone, 121.77 L·m-2·h-1·bar-1). The rejection rate of Acid fuchsin (AF,585 Da) exceeded 92% in DMF. The membranes exhibited excellent stability. Even after ultrasound, solvent immersion, high temperature treatment, fouling by BSA, and a long operation process, the composite membrane still maintains its original microstructure and separation performance. Taken together, this work may provide considerations in designing high performance and robust GO membranes with a stable interface.