Surface modification of thin-film nanofiltration membranes was carried out to produce high water permeable NF membranes by Air-Ar plasma treatment. The effect of composition of used gases on membrane properties was investigated. Results showed that the plasma treatment decreased the water contact angle obviously from 80.4 ° to 6.5°, which in turn would increase the membrane surface hydrophilicity. The results of FTIR spectra decisively confirmed the formation of hydrophilic nitrogen and oxygen compounds on the membrane surface. The SEM images of membrane surface also showed significant changes after plasma treatment. AFM analysis indicated smoother surface for the modified membranes compared to pristine membrane; the roughness declined from 55.85 nm for virgin membrane to 28.33 nm for modified membranes. The salt rejection was 90% for pristine membrane and 76.35% to 92.45% for the plasma treated membranes. The water flux for modified membrane treated by 50% Air-50% Ar plasma increased ∼1,446.1% compared to the virgin membrane, whereas the selectivity declined only ∼15.1%.

中文翻译：

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空气-氩等离子体表面处理高渗透薄膜纳滤膜的研制

对薄膜纳滤膜进行表面改性，通过 Air-Ar 等离子体处理制备高透水性 NF 膜。研究了所用气体的组成对膜性能的影响。结果表明，等离子体处理使水接触角从80.4°明显降低到6.5°，进而增加了膜表面的亲水性。FTIR 光谱的结果决定性地证实了在膜表面形成了亲水性氮和氧化合物。等离子体处理后膜表面的SEM图像也显示出显着的变化。AFM 分析表明，与原始膜相比，改性膜的表面更光滑；粗糙度从原始膜的 55.85 nm 下降到改性膜的 28.33 nm。原始膜的脱盐率为 90%，等离子处理膜的脱盐率为 76.35% 至 92.45%。与原始膜相比，经 50% 空气-50% Ar 等离子体处理的改性膜的水通量增加了约 1,446.1%，而选择性仅下降了约 15.1%。