Novel polyvinylidene fluoride-calcium alginate (PVDF-CaAlg) nanofiltration (NF) membranes were prepared by impregnating electrospun PVDF substrates with sodium alginate solution and crosslinking with CaCl₂ solution. The NF membranes were characterized via field emission scanning electron microscopy (FESEM) equipped with an energy-dispersive spectrometry (EDS), attenuated total reflectance Fourier transform infrared spectra (ATR-FTIR), and X-ray photoelectron spectroscopy (XPS). The results show that the prepared PVDF-CaAlg NF membranes exhibit dual thin-film-composite (TFC) structure and superior surface hydrophilicity. The highest pure water flux can achieve 63.8 L·m⁻²·h⁻¹·bar⁻¹ accompanied with a 98.5% rejection rate for methyl blue (MB), which is superior to many polymeric NF membranes. The prepared PVDF-CaAlg NF membranes exhibit much higher rejections for seven typical dyes, and the rejection slightly rises with the increase of impregnating time. In the long-term filtration process, the permeation flux for dye solution remains stable. PVDF-CaAlg NF membranes show good anti-fouling performance to BSA protein and lactobacillus.

新型聚偏二氟乙烯-海藻酸钙（PVDF-CaAlg）纳滤（NF）膜是通过用海藻酸钠溶液浸渍电纺PVDF基材并与CaCl ₂溶液交联制备的。NF膜通过配备有能量色散光谱仪（EDS），衰减的全反射傅立叶变换红外光谱（ATR-FTIR）和X射线光电子能谱（XPS）的场发射扫描电子显微镜（FESEM）进行表征。结果表明，所制备的PVDF-CaAlg NF膜具有双重薄膜复合（TFC）结构和优异的表面亲水性。最高的纯净水通量可以达到63.8 L·m ^-2 ·h ^-1 ·bar ^-1伴随着甲基蓝（MB）的98.5％拒绝率，优于许多聚合物NF膜。制备的PVDF-CaAlg NF膜对7种典型染料表现出更高的截留率，并且随着浸渍时间的增加，截留率略有上升。在长期过滤过程中，染料溶液的渗透通量保持稳定。PVDF-CaAlg NF膜对BSA蛋白和乳杆菌具有良好的防污性能。