为了提高聚偏氟乙烯(PVDF)膜的亲水性和分离性能,以离子液体1-乙基-3-甲基咪六氟磷酸盐([EMIM]PF6)为添加剂,PVDF为聚合物,N,N-二甲基甲酰胺(DMF)为溶剂,聚乙烯吡络烷酮K30(PVP)为致孔剂。将PVDF溶于DMF中,加入比例分别为1%、2%、3%、4%、5%的[EMIM]PF6,应用相转化法(NIPS)制备离子液体([EMIM]PF6)/PVDF共混膜。通过扫描电镜和傅里叶红外光谱对膜的形貌特征进行表征,对水通量、截留率等进行测试以考察膜的亲水性和分离性能。结果表明:[EMIM]PF6的引入大大提高了PVDF膜的亲水性和分离性能。并且当离子液体1-乙基-3-甲基咪六氟磷酸盐含量为4.0%时,膜的综合性能达到最优,与PVDF纯膜相比,纯水通量和截留率分别提升了80.3%和15.01%。
In order to improve the hydrophilicity and separation performance of PVDF membrane,ionic liquid 1-ethyl-3-methylimidium hexafluorophosphate ([EMIM]PF6) was used as the additive,polyvinylidene fluoride (PVDF) as the polymer,N,N-dimethylformamide (DMF) as the solvent and polyvinylpyrrolidone K30 (PVP) as the porogen.Firstly,polyvinylidene fluoride (PVDF) was dissolved in the solvent,and added with 1%,2%,3%,4% and 5% [EMIM]PF6,respectively.The phase conversion (NIPS) was applied to prepare ILs([EMIM]PF6)/PVDF blended membrane in the process.Then via scanning electron microscopy(SEM) and fourier transform infrared spectroscopy(FTIR),the water flux,rejection and so on were tested to investigate the hydrophilicity and separation performance of the membrane.The results shown that [EMIM]PF6 greatly improved the hydrophilicity and separation performance of PVDF membranes.And when the content of 1-ethyl-3-methylimipene hexafluorophosphate was 4.0%,the comprehensive performance was the optimal.Compared with the pure PVDF membrane,its pure water flux and retention rate are increased by 80.3% and 15.01% respectively.
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