We prepared side-chain grafted functional groups poly(vinylidene fluoride-hexafluoropropylene) (PVDF-HFP) fluorinated membranes to fine control hydrophobic and anti-fouling nature of membrane for desalination of high saline water by vacuum membrane distillation (VMD) process. Different functional groups viz. tri-methoxy silane, 4-methyl styrene, and 2, 3, 4, 5, 6-penta fluoro styrene were explored for side-chain grafting with PVDF-HFP matrix to improve the hydrophobic nature. Successful grafting of functional groups was confirmed by spectral analysis, while surface morphology of different membranes was assessed by scanning electron and atomic force microscopy. Membrane performance was assessed by permeate flux, fouling resistant nature, water contact angle and long-term performance. Among different prepared membranes, 2, 3, 4, 5, 6-penta fluoro styrene grafted PVDF-HFP membrane (M-PFS) was assessed suitable for VMD with permeate water flux (36% increase compared to the pristine membrane), salt rejection (99.99%), rechargeable (anti-fouling) nature by simple water washing, and longevity. The reported M-PFS membrane with novel architecture is a promising contender for desalination of high saline water by the VMD process.

我们制备了侧链接枝官能团聚（偏二氟乙烯-六氟丙烯）（PVDF-HFP）氟化膜，以通过真空膜蒸馏（VMD）工艺精细控制膜的疏水性和防污性，用于高盐水脱盐。不同的功能组即。探索了三甲氧基硅烷、4-甲基苯乙烯和 2, 3, 4, 5, 6-五氟苯乙烯与 PVDF-HFP 基质的侧链接枝，以改善疏水性。通过光谱分析证实了官能团的成功接枝，而通过扫描电子和原子力显微镜评估了不同膜的表面形态。膜性能通过渗透通量、抗污染性、水接触角和长期性能进行评估。在不同制备的膜中，2、3、4、5、6-五氟苯乙烯接枝 PVDF-HFP 膜 (M-PFS) 被评估适用于 VMD，具有渗透水通量（与原始膜相比增加 36%）、脱盐率（99.99%）、可充电（防污）性质简单的水洗，长寿。报道的具有新颖结构的 M-PFS 膜是通过 VMD 工艺淡化高盐水的有希望的竞争者。