Graphene oxide (GO)-based membranes have been widely used for molecular separation due to their size exclusion effect. However, it remains a challenge to prepare a structurally stable, freestanding GO-based membrane that exhibits efficient separation. Herein, GO nanofiltration (NF) membranes with different loadings of TiO₂ (TiO₂@GO) were successfully prepared on top of a polysulfone (PSF) support layer and showed high efficiency in dye separation/desalination, along with antifouling and antibacterial activity. The resulting TiO₂@GO NF membranes also showed excellent structural stability. The membrane prepared with the same contents of GO and TiO₂ (NFG-2) exhibited high dye rejection (> 98%) and low Na₂SO₄ rejection (< 6%) and thus could be applied in the treatment of dye wastewater. Moreover, its permeation flux (3.6 L·m⁻²·h⁻¹·bar^-1) and dye rejection (98.0%) remained constant at high levels after 9 hours of operation. Antifouling and antibacterial properties were also observed. This new kind of NF membrane may be a promising candidate for use in dye separation and desalination applications.

基于氧化石墨烯（GO）的膜由于其尺寸排阻作用而被广泛用于分子分离。然而，制备显示有效分离的结构稳定的，独立的基于GO的膜仍然是挑战。在这里，成功地在聚砜（PSF）支撑层上制备了具有不同负载量的TiO ₂（TiO ₂ @GO）的GO纳滤（NF）膜，该膜在染料分离/脱盐方面具有很高的效率，并且具有防污和抗菌活性。所得的TiO ₂ @GO NF膜也显示出优异的结构稳定性。用相同含量的GO和TiO ₂（NFG-2）制备的膜表现出高的染料截留率（> 98％）和低的Na ₂ SO₄排斥（<6％），因此可用于处理染料废水。另外，在操作9小时后，其通量（3.6L·m ^-2 ·h ^-1 ·bar ^-1）和染料截留率（98.0％）在高水平下保持恒定。还观察到了防污和抗菌性能。这种新型的NF膜可能是用于染料分离和脱盐应用的有前途的候选物。