Abstract：
Tunable regulation of molecular penetration through porous membranes is highly desirable for membrane applications in the pharmaceutical and medical fields. However, in most previous reports additional reagents or components are usually needed to provide the graphene-based membranes with responsiveness. Herein, we report tunable arch-bridged reduced graphene oxide (rGO) nanofiltration membranes modulated by the applied voltage. Under a finite voltage of 5 V, the rGO membrane could completely reject organic/anionic molecules. With assistance of the voltage, the positive-charge-modified rGO membrane realized the universal rejection of both cationic and anionic dyes, also showing the valid modulation in harsh organic solvents. The efficient electrical modulation depended on the synergetic effects of Donnan repulsion and size exclusion, benefiting from the electric field enhancement in arch-bridged rGO structures. Furthermore, multicomponent separation was achieved by our electrically modulated rGO-based membranes, demonstrating their potential in practical applications such as pharmaceutical industries.
摘要：
通过多孔膜的分子渗透的可调谐调节对于药物和医学领域中的膜应用是高度期望的。然而,在大多数以前的报道中,通常需要额外的试剂或组分来提供具有响应性的基于石墨烯的膜。在这里，我们报告了可调拱形桥接还原氧化石墨烯（rGO）纳滤膜通过施加电压调制。在5V的有限电压下，rGO膜可以完全排斥有机/阴离子分子。在电压的帮助下，正电荷改性的rGO膜实现了对阳离子和阴离子染料的普遍排斥，还显示了在苛刻的有机溶剂中的有效调制。有效的电调制取决于Donnan排斥和尺寸排斥的协同作用，受益于拱形桥接rGO结构的电场增强。此外，多组分分离是通过我们的电调制rGO基膜实现的，展示其在制药行业等实际应用中的潜力。
