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首页> 外文期刊>Journal of Applied Polymer Science >Preparation and characterization of asymmetric polyethersulfone nanofiltration membranes: The effects of polyvinylpyrrolidone molecular weights and concentrations
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Preparation and characterization of asymmetric polyethersulfone nanofiltration membranes: The effects of polyvinylpyrrolidone molecular weights and concentrations

机译：不对称聚醚砜纳滤膜的制备和表征：聚乙烯吡咯烷酮分子量和浓度的影响

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摘要

In this study, asymmetric flat-sheet polyethersulfone (PES) nanofiltration (NF) membranes were prepared via immersion precipitation phase inversion with the addition of polyvinylpyrrolidone (PVP). The effects of PVP with the molecular weights (MW) from 17 to 1400 kDa and the concentration from 0 to 3.0 wt % on the morphologies and performances of PES membranes were systematically studied. The prepared membranes were characterized by SEM, AFM, AIR-ETIR, contact angle, membrane porosity, the water flux, and the rejection measurement. The results indicated that the porosity and the hydrophilicity of PES NF membrane increased with increasing PVP concentration, and the hydrophilicity of PES NF membrane also improved with increasing PVP MW. The enhancements of the porosity and hydrophilicity resulted in the higher water flux of PES NE membrane. The rejection of Bordeaux S (MW 604.48 Da) for the prepared PES membrane was increased to above 90% with the low PVP concentration, but it turned to decrease remarkably when the PVP concentration reached to a critical value which related to PVP MW. It was concluded that the addition of a small amount of PVP could significantly increase the permeability of PES NE membrane and maintain its rejection of Bordeaux S above 90%. (C) 2016 Wiley Periodicals, Inc.
机译：在这项研究中，不对称平板聚醚砜（PES）纳滤（NF）膜是通过浸入沉淀相转化并添加聚乙烯吡咯烷酮（PVP）制备的。系统研究了分子量为17〜1400 kDa，浓度为0〜3.0 wt％的PVP对PES膜的形貌和性能的影响。通过SEM，AFM，AIR-ETIR，接触角，膜孔隙率，水通量和截留率测量来表征所制备的膜。结果表明，随着PVP浓度的增加，PES NF膜的孔隙率和亲水性增加;随着PVP MW的增加，PES NF膜的亲水性也得到改善。孔隙率和亲水性的增强导致PES NE膜的水通量更高。在低PVP浓度下，制备的PES膜的波尔多S（MW 604.48 Da）截留率提高到90％以上，但当PVP浓度达到与PVP MW相关的临界值时，其截留率显着下降。结论是，添加少量的PVP可以显着提高PES NE膜的渗透性，并保持其对波尔多S的排斥率在90％以上。 （C）2016威利期刊公司

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