聚乙二醇添加剂对聚砜正渗透膜性能的影响

发布时间：2018-03-20 04:09

本文选题：正渗透　切入点：聚砜　出处：《膜科学与技术》2017年01期 　论文类型：期刊论文

【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层的复合正渗透膜.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.在不同PEG400质量分数下,支撑层的接触角、孔隙率接近.RO测试结果发现,随着PEG400质量分数增加,复合正渗透膜纯水通量增大,当PEG400质量分数为8%时,正渗透膜的纯水渗透系数(A)值最大[16.2L/(m~2·h·MPa)],膜结构参数(S)值最小(516μm).在FO测试中发现,随着PEG400质量分数的增加,正渗透膜水通量(Jv)先增大后减小,在PEG400质量分数为8%时达到最大值,分别为12.5L/(m~2·h)(AL-FS模式,活性皮层面向料液)和23.8L/(m~2·h)(AL-DS模式,活性皮层面向驱动液).实验表明,8%的PEG400添加量可以最有效地降低支撑层的内浓差极化程度.
[Abstract]:A series of composite normal osmotic membranes with polysulfone as the supporting layer were successfully prepared by phase inversion and interfacial polymerization with different proportion of PEG400 as additives. The thermodynamic and kinetic analysis of the casting solution showed that the more the amount of PEG400 was added, The faster the phase conversion rate is, the more the phase transition rate affects the morphology of the support layer. The contact angle and porosity of the support layer are close to .RO under different PEG400 mass fraction. The results show that with the increase of PEG400 mass fraction, the contact angle and porosity of the support layer are close to. When the mass fraction of PEG400 is 8, the permeation coefficient of pure water is the highest [16.2 L / m ~ (2 路h 路MPa)], and the membrane structure parameter (S) is the minimum value of 516 渭 m ~ (-1). In FO test, it is found that, with the increase of PEG400 mass fraction, The water flux of normal osmotic membrane increased first and then decreased, and reached the maximum at 8 PEG400 mass fraction, which were 12.5L / m ~ 2 路h ~ (-1) AL-FS model and 23.8L / m ~ (2 路h) 路h ~ (-1) AL-DS model, respectively. The experimental results show that the concentration polarization of the supporting layer can be reduced most effectively by adding 8% PEG400 to the active cortex.
【作者单位】：中国科学院上海高等研究院;中国科学院大学;华特迪士尼(中国)有限公司迪士尼中国研究;
【基金】：国家自然科学基金资助项目(21507142,21176119,U150711) 迪士尼中国研究基金
【分类号】：TQ051.893

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