Activation promoted ionic liquid modification of reverse osmosis membrane towards enhanced permeability for desalination
Activation promoted ionic liquid modification of reverse osmosis membrane towards enhanced permeability for desalination
复制标题
活化促进反渗透膜的离子液体改性，以增强海水淡化的渗透性
DOI：
10.1016/j.jtice.2017.07.027
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发表时间：
2017-11
影响因子：
5.7
通讯作者：
Han Siyuan
中科院分区：
文献类型：
--
作者：
Zhang Jinglong;Qin Zhenping;Yang Libin;Guo Hongxia;Han Siyuan
采用加成反应合成的离子液体1，3-二甲基咪唑磷酸二甲酯（[MMIM][N]），通过活化法对商品反渗透膜进行改性。在浸泡时间为4 min、活化温度为110°C、活化时间为4 min的最佳条件下，活化促进改性过程仅在6 - 12 min内完成。通过SEM、AFM、水接触角、FTIR表征了膜的表面形貌和性能变化，并通过1000 mg·L-1 NaCl水溶液脱盐评价了膜的反渗透性能。结果表明，随着活化温度的升高，改性反渗透膜的活性层变薄、变光滑、亲水性增强。IL改性的膜实现了33.7 L m-2 h-1的水通量和93.2%的截留率，与原始膜相比显示出62%的高水通量和2.6%的盐截留率。此外，IL改性膜表现出增强的抗污染性能与95.5%的归一化水通量恢复。本工作为改进和提高商用薄膜复合反渗透膜的分离性能和抗污染性能提供了一种简便有效的方法。
The ionic liquid (1,3-dimethylimidazolium dimethyl phosphate ([MMIM][DMP])) synthesized by addition reaction was used to modify a commercial reverse osmosis (RO) membrane thorough activation method. The activation promoted modification process was completed within just 6−12 min under optimal condition of the immersion time of 4 min, activation temperature of 110°C and activation time of 4 min. The variation of surface morphologies and properties of the RO membrane were characterized by SEM, AFM, water contact angle, FTIR, and the RO performance was evaluated by desalination of 1000 mg⋅L−1NaCl aqueous solution. The results showed that the active layer of the modified RO membrane became thinner, smoother, and more hydrophilic with increasing of activation temperature. The IL modified membrane achieved water flux of 33.7 L m−2h−1and rejection of 93.2%, showing 62% higher water flux comparing to the pristine membrane and 2.6% decrease in salt rejection. Moreover, the IL modified membrane showed an enhanced anti-fouling property with 95.5% of normalized water flux recovery. This work provides a facile and efficient way to modify and improve separation performance and anti-fouling property of commercial thin film composite (TFC) RO membranes.
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