膜科学与技术

聚乙二醇添加剂对聚砜正渗透膜性能的影响

作者：刘仁啸，陈刚，王艳强，李雪梅，何涛

单位： 1.中国科学院上海高等研究院，上海 201210； 2.中国科学院大学，北京 100049； 3.华特迪士尼（中国）有限公司，迪士尼中国研究，上海 200031

关键词：正渗透；聚砜；界面聚合；结构参数；内浓差极化

出版年,卷(期):页码： 2017,37(1):36-43

摘要：

以不同比例聚乙二醇（PEG400）为添加剂，通过相转化法和界面聚合过程，成功制备了一系列以聚砜为支撑的复合正渗透膜。对铸膜液的热力学和动力学分析表明，PEG400添加量越多，相转化速率越快，而相转化速率又影响了正渗透膜支撑层的形貌结构。不同PEG400含量支撑层的接触角、孔隙率接近。RO测试结果发现，随着PEG400含量增加，复合正渗透膜纯水通量增大，当PEG400含量为8wt%时（PSF-8），正渗透膜的纯水渗透系数（A）值最大（1.62 L/m2·h·bar），膜结构参数（S）值最小（516 μm）。在FO测试中发现，随着PEG400含量的增加，正渗透膜水通量 (Jv) 先增大后减小，在PSF-8时达到最大值，分别为12.5 L/m2h（AL-FS模式，活性皮层面向料液）和23.8 L/m2h（AL-DS模式，活性皮层面向驱动液）。实验表明8wt%的PEG400添加量可以最有效地降低支撑层的内浓差极化程度。

Effects of PEG400 concentration in the polysulfone (PSF) dope solution on the substrate morphology and performance of the thin-film composite (TFC) forward osmosis (FO) membranes were investigated. Thermodynamic and kinetic analysis showed that the phase inversion was faster at higher PEG400 concentration. The contact angle and porosity of the PSF substrate at various PEG400 concentrations were similar, but the reverse osmosis (RO) water permeability of the TFC FO membrane increased as the PEG400 increased. The structure parameter (S) decreased to 516 μm at PEG400 concentration of 8wt%, and then increased. The TFC FO membrane showed the highest FO water flux (Jv) at 8wt% PEG400 in both AL-FS mode (12.5 L/m2h) and AL-DS mode (23.8 L/m2h). This means that PSF-8 has the lowest internal concentration polarization (ICP).

第一作者简介：刘仁啸（1990- ），男，山东青岛人，硕士生，主要研究正渗透膜分离技术，E-mail：seanmiller123@163.com * 通讯作者，E-mail: het@sari.ac.cn

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