This study explored the feasibility of applying sequential argon‐CF₄ plasmas treatment as a featured approach towards enhancement of polyvinylidene fluoride (PVDF) membrane structure and surface topography for application in membrane distillation (MD). Systematic procedures were conducted to synthesize membranes of different combinations composed mainly from PVDF and assisted by addition of polyvinylpyrrolidone (PVP) at different percentages. Upon casting four classes of the membranes, the analysis results via Scanning Electron Microscopy (SEM), Energy Dispersive X‐Ray Spectroscopy (EDS), Fourier Transform Infrared Spectroscopy (FTIR), Thermal Gravimetric Analysis (TGA), as well as the contact angle measurements have shown that the membrane surface topography was mediated in terms of appearance of clear bumps on the surface. Upon implementing the sequential treatment cycles for several durations, the surface topography has considerably changed at the end of argon treatment cycle in terms of appearance of pores at small size. Further changes on the surface topography were detected at the end of CF₄ treatment cycle elucidated by increase in the pore size and uniform distribution of the pores along the examined membranes. The function of the sequential plasma treatment was become certain upon implementing MD experiments for dilute solution of ethanol/water, in which higher permeation water flux and permeate separation index were observed for membranes of higher PVP content and sequentially treated for 6 min.

中文翻译：

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喷射等离子体在改善聚偏二氟乙烯膜性能以增强膜蒸馏中的应用

这项研究探讨了应用连续式氩气CF ₄的可行性。等离子体处理是增强聚偏二氟乙烯（PVDF）膜结构和表面形貌的重要方法，可用于膜蒸馏（MD）。进行了系统的程序来合成主要由PVDF组成的不同组合的膜，并辅以不同百分比的聚乙烯吡咯烷酮（PVP）。浇铸四类膜后，通过扫描电子显微镜（SEM），能量色散X射线光谱仪（EDS），傅里叶变换红外光谱仪（FTIR），热重分析（TGA）以及接触角分析结果测量表明，膜表面的形貌是由表面上清晰的凸起的出现所介导的。在实施连续几个周期的治疗周期后，就小尺寸孔的出现而言，在氩气处理周期结束时，表面形貌已发生了很大变化。在CF末端检测到表面形貌的进一步变化通过增加孔的尺寸和沿着被检查的膜的孔的均匀分布来阐明_4个处理周期。在对乙醇/水的稀溶液进行MD实验后，顺序等离子体处理的功能变得确定，其中对PVP含量较高的膜观察到较高的渗透水通量和渗透物分离指数，并对其进行了6分钟的处理。