Effect of Hydrophilization Additive and Reaction Time on Separation Properties of Polyamide Nanofiltration Membrane
Effect of Hydrophilization Additive and Reaction Time on Separation Properties of Polyamide Nanofiltration Membrane
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DOI：
10.1081/ss-120030770
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发表时间：
2005-01
影响因子：
2.8
通讯作者：
A. Ahmad;B. .. Ooi;J. P. Choudhury
中科院分区：
文献类型：
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作者：
A. Ahmad;B. .. Ooi;J. P. Choudhury
摘要通过控制界面聚合（IP）过程中亲水性添加剂[3,5‐二氨基苯甲酸（BA）]的含量和反应时间，可以优化薄膜复合（TFC）纳滤膜的通量和截留率。采用Donnan立体孔流模型（DSPFM），将不带电的溶质穿过膜，确定孔径（r p）和有效厚度/孔隙度（Δx/A k）。利用拟合的r p和Δx/A k数据分析了涂层条件与NaCl渗透性能的关系。结果表明，随着反应时间的延长，孔径减小。交联降低了聚哌嗪酰胺膜的孔隙率，但加入少量BA后，反应时间越长，孔隙率越高。少量BA可以增加通量和截留量，特别是在较高压力下。
Abstract Thin film composite (TFC) nanofiltration membrane can be optimized in terms of flux and rejection by controlling the hydrophilization additive [3,5‐diaminobenzoic acid (BA)] content and reaction time in the interfacial polymerization (IP) process. By using the Donnan steric pore flow model (DSPFM), uncharged solute was passed through the membrane to determine the pore size (r p) as well as the effective thickness/porosity (Δx/A k ). The coating condition was related to the performance of NaCl permeation using the fitted r p and Δx/A k data. It was found that the pore size was reduced as reaction time was increased. Cross‐linking reduced the porosity of polypiperazinamide membrane but it was noticed that by adding a small amount of BA, the porosity was increased at longer reaction time. A small amount of BA could increase both the flux and rejection especially at higher pressure.