A non-MPD-type reverse osmosis membrane with enhanced permselectivity for brackish water desalination
A non-MPD-type reverse osmosis membrane with enhanced permselectivity for brackish water desalination
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一种用于苦咸水淡化的增强选择性渗透的非MPD型反渗透膜
DOI：
10.1016/j.memsci.2018.08.015
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发表时间：
2018
影响因子：
9.5
通讯作者：
Xuan Zhang
中科院分区：
文献类型：
--
作者：
Junfeng Zheng;Yujian Yao;Meng Li;Lianjun Wang;Xuan Zhang
设计并合成了一种新型磺化二胺单体3，3 ′-（乙烷-1，2-二基双（氮烷二基））双（2，6-二甲基苯磺酸）（EDADBSA），以均苯三甲酰氯（TMC）为引发剂，采用界面聚合（IP）技术制备了一种新型薄膜复合反渗透（TFC）膜。特别地，在IP过程期间，EDADBSA被用作水相中的唯一反应物，而不是常规的间苯二胺（MPD）。由于存在两个甲基旁边的苯氨基，可以发挥很强的空间位阻的影响，聚酰胺主链的旋转显着加强，清楚地说明了分子动力学模拟。以这种方式，在聚合物基质中产生足够的自由体积，从而允许较低的抗水渗透性。该膜的最佳纯水透过率（PWP）为1.9 ± 0.2 L m− 2 h −1bar−1，是相同条件下自制MPD/TMC膜的2.6-2.7倍。此外，独特的甲基取代基也可以作为空隙占据剂，允许TFC膜保持合理的高水-溶质选择性。与商业BW 30 FR（Dow Chemical）相比，新型膜在模拟脱盐测试中显示出上级的排斥所有离子的能力，揭示了其作为苦咸水脱盐的分离介质的有前途的潜力。
A new sulfonated diamine monomer, namely 3,3′-(ethane-1,2-diylbis(azanediyl))bis(2,6-dimethylbenzenesulfonic acid) (EDADMBSA), was designed and synthesized in order to fabricate a novel thin-film composite (TFC) reverse osmosis (RO) membrane by using the interfacial polymerization (IP) technique with trimesoyl chloride (TMC). In particular, EDADMBSA was employed as the sole reactant in the aqueous phase during the IP process, instead of the conventionalm-phenylene diamine (MPD). Due to the presence of two methyl groups next to a phenylamino group that could exert a strong steric hindrance influence, the rotation of the polyamide main chain was significantly enforced, as clearly illustrated by a molecular dynamics simulation. In this manner, sufficient free volumes were generated in the polymer matrix, allowing for a lower water penetration resistance. The optimal pure water permeability (PWP) attained with this EDADMBSA/TMC membrane was as high as 1.9 ± 0.2 L m−2h−1bar−1, which is 2.6–2.7 times greater than that of a self-made MPD/TMC membrane under the same test conditions. Furthermore, the unique methyl substituents could also serve as void occupiers, allowing the TFC membrane to retain a reasonably high water-solute selectivity. Compared to commercial BW30FR (Dow Chemical), the novel membrane displayed a superior ability to reject all the ions in a simulated desalination test, revealing its promising potential as a separation medium for brackish water desalination.