Abstract A new sulfonated diamine monomer, 4,4′-((1,4-phenylenebis(methylene))bis(azanediyl))dibenzenesulfonic acid (PMABSA) was synthesized and used as the sole aqueous reactant to fabricate a novel reverse osmosis (RO) membrane with trimesoyl chloride (TMC), in place of conventional m-phenylene diamine (MPD). The separation performance of the PMABSA/TMC membrane was optimized by the response surface method (RSM) by means of evaluating the pure water permeability (PWP) and salt rejection (R) to NaCl, and optimal results of PWP of 1.18 ± 0.03 L m−2 h−1 bar−1, and R of 98.2 ± 0.4%, respectively, were achieved at 1.55 MPa. Owing to the rigid benzene ring in the center of the molecule, which may have a blocking effect during the interfacial polymerization (IP) process, the resulting barrier layer was less compact and had low thickness. Both molecular dynamics (MD) simulation and positron annihilation spectroscopy (PAS) revealed the creation of sufficient free volumes in the sulfonated polyamide matrix. Regardless of the slightly lower water permeation, the PMABSA/TMC membrane exhibited a superior rejection ability to all the ions compared to that of commercial SW30HR (Dow Chemical) in a model seawater separating test. Overall, all the results indicated the great potential of the novel membrane as a new choice of non-MPD RO membrane for seawater desalination.

中文翻译：

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一种用于海水淡化的新型磺化反渗透膜：实验和分子动力学研究

摘要 合成了一种新的磺化二胺单体 4,4'-((1,4-亚苯基双(亚甲基))双(氮杂二基))二苯磺酸 (PMABSA)，并将其作为唯一的水性反应物来制备新型反渗透 (RO)。 ) 均苯三甲酰氯 (TMC) 膜，代替传统的间苯二胺 (MPD)。PMABSA/TMC 膜的分离性能通过响应面法 (RSM) 通过评估纯水渗透率 (PWP) 和盐截留率 (R) 对 NaCl 进行优化，PWP 的最佳结果为 1.18 ± 0.03 L m -2 h-1 bar-1 和 R 分别为 98.2 ± 0.4%，在 1.55 MPa 下实现。由于分子中心的刚性苯环在界面聚合 (IP) 过程中可能具有阻塞作用，因此所得阻隔层不太紧凑且厚度较低。分子动力学 (MD) 模拟和正电子湮没光谱 (PAS) 均表明在磺化聚酰胺基质中产生了足够的自由体积。尽管水渗透率略低，但在模型海水分离试验中，与商用 SW30HR（陶氏化学公司）相比，PMABSA/TMC 膜对所有离子均表现出优异的截留能力。总体而言，所有结果表明新型膜作为海水淡化非 MPD RO 膜的新选择具有巨大潜力。在模型海水分离试验中，与商业 SW30HR（陶氏化学）相比，PMABSA/TMC 膜对所有离子表现出优异的截留能力。总体而言，所有结果表明新型膜作为海水淡化非 MPD RO 膜的新选择具有巨大潜力。在模型海水分离试验中，与商用 SW30HR（陶氏化学）相比，PMABSA/TMC 膜对所有离子表现出优异的截留能力。总体而言，所有结果表明新型膜作为海水淡化非 MPD RO 膜的新选择具有巨大潜力。