Mukai Yasuhito, Liu Song, Takayama Yoshihiro, Hayashi Yui, Mano Kakeru, Takahashi Shigenori, Kanda Hideki, Goto Motonobu
Department of Chemical Systems Engineering, Nagoya University, Nagoya 4648603, Japan.
Department of Materials Process Engineering, Nagoya University, Nagoya 4648603, Japan.
ACS Omega. 2021 Oct 15;6(42):28038-28048. doi: 10.1021/acsomega.1c04044. eCollection 2021 Oct 26.
Nanofiber membranes have outstanding potential for filtration applications due to their great specific surface area, high porosity, and modifiable structure. Compared to conventional membranes, nanofiber membranes offer substantial high flux and high rejection ratios. This paper provides a comprehensive analysis on the filtration performance of plasma treatment on the polyacrylonitrile nanofiber membrane. The pores in the original membrane were utilized about a mere 10%, while those of the plasma-irradiated membrane were utilized nearly 60%. The membrane modification was performed using N, O, and Ar plasma. It was found that Ar plasma was most effective for etching the membrane structure. Fourier transform infrared spectroscopy was applied to detect the chemical changes on the membranes. The contact angle of the water droplets on the original membrane was 96.1°; however, after the Ar plasma treatment, it declined to 0°. Finally, the particle retention details in different cross sections of the filtered membranes were observed via a scanning electron microscope. The main innovation is to clarify the changes in the mechanism of the nanofiber membrane trapping particles before and after plasma treatment. In the filtration test after plasma treatment, the internal space of the membrane was fully and effectively utilized, and the flux was also improved. The obtained results suggest a potential application of the plasma-treated nanofiber membrane in water treatment.
纳米纤维膜因其巨大的比表面积、高孔隙率和可改性结构，在过滤应用方面具有突出潜力。与传统膜相比，纳米纤维膜具有显著更高的通量和截留率。本文对等离子体处理聚丙烯腈纳米纤维膜的过滤性能进行了全面分析。原始膜中的孔隙利用率仅约为10%，而等离子体辐照膜的孔隙利用率接近60%。使用N、O和Ar等离子体进行膜改性。发现Ar等离子体对蚀刻膜结构最有效。应用傅里叶变换红外光谱法检测膜上的化学变化。原始膜上水滴的接触角为96.1°；然而，经过Ar等离子体处理后，接触角降至0°。最后，通过扫描电子显微镜观察过滤膜不同横截面中的颗粒截留细节。主要创新点在于阐明等离子体处理前后纳米纤维膜捕获颗粒机制的变化。在等离子体处理后的过滤试验中，膜的内部空间得到了充分有效的利用，通量也有所提高。所得结果表明等离子体处理的纳米纤维膜在水处理方面具有潜在应用。
