Ultrathin Two‐Dimensional Porous Fullerene Membranes for Ultimate Organic Solvent Separation

Abstract Two‐dimensional (2D) materials with high chemical stability have attracted intensive interest in membrane design for the separation of organic solvents. As a novel 2D material, polymeric fullerenes (C 60 ) ∞ with distinctive properties are very promising for the development of innovative membranes. In this work, we report the construction of a 2D (C 60 ) ∞ nanosheet membrane for organic solvent separation. The pathways of the (C 60 ) ∞ nanosheet membrane are constructed by sub‐1‐nm lateral channels and nanoscale in‐plane pores created by the depolymerization of the (C 60 ) ∞ nanosheets. Attributing to ordered and shortened transport pathways, the ultrathin porous (C 60 ) ∞ membrane is superior in organic solvent separation. The hexane, acetone, and methanol fluxes are up to 1146.3±53, 900.4±41, and 879.5±42 kg ⋅ m −2 ⋅ h −1 , respectively, which are up to 130 times higher than those of the state‐of‐the‐art membranes with similar dye rejection. Our findings demonstrate the prospect of 2D (C 60 ) ∞ as a promising nanofiltration membrane in the separation of organic solvents from macromolecular compounds such as dyes, drugs, hormones, etc.