Chen Dandan, Chen Qiang, Liu Tianyu, Kang Jian, Xu Ruizhang, Cao Ya, Xiang Ming
State Key Laboratory of Polymer Materials Engineering, Polymer Research Institute of Sichuan University Chengdu 610065 China
RSC Adv. 2019 Jun 27;9(35):20149-20160. doi: 10.1039/c9ra02922b. eCollection 2019 Jun 25.
To prepare polyamide thin-film composite reverse osmosis (PA-TFC-RO) membranes with high performance, l-arginine (Arg) was used as an additive in -phenylenediamine (MPD) aqueous solution. Arg with active amine groups can react with 1,3,5-benzenetricarboxylic chloride (TMC) to be incorporated into the polyamide selective layer during interfacial polymerization. X-ray photoelectron spectroscopy verified the successful introduction of Arg into the polyamide selective layer. Scanning electron microscopy, atomic force microscopy, contact angle and zeta potential measurements manifested that the polyamide selective layer was thinner, smoother, more hydrophilic and less negatively charged after the incorporation of Arg. The thinner and more hydrophilic polyamide selective layers favor the boosting of the permeability of the RO membrane by decreasing the hydraulic resistance to water permeation. Consequently, when the content of Arg was 0.5 wt%, the water flux and salt rejection of the resulting membranes increased from the original 46.46 L m h and 96.34% to 54.13 L m h and 98.36%. Besides, the modified membranes showed excellent fouling-resistance and easy-cleaning properties when tested by using bovine serum albumin (BSA) and dodecyltrimethyl ammonium bromide (DTAB) as model foulants.
为制备具有高性能的聚酰胺薄膜复合反渗透（PA-TFC-RO）膜，在间苯二胺（MPD）水溶液中使用L-精氨酸（Arg）作为添加剂。带有活性胺基的Arg可与1,3,5-苯三甲酰氯（TMC）反应，并在界面聚合过程中掺入聚酰胺选择性层中。X射线光电子能谱验证了Arg成功引入聚酰胺选择性层。扫描电子显微镜、原子力显微镜、接触角和zeta电位测量表明，掺入Arg后聚酰胺选择性层更薄、更光滑、更亲水且带负电荷更少。更薄且更亲水的聚酰胺选择性层有利于通过降低水渗透的水力阻力来提高反渗透膜的渗透率。因此，当Arg含量为0.5 wt%时，所得膜的水通量和脱盐率从原来的46.46 L m h和96.34%分别提高到54.13 L m h和98.36%。此外，当使用牛血清白蛋白（BSA）和十二烷基三甲基溴化铵（DTAB）作为模型污染物进行测试时，改性膜表现出优异的抗污染和易清洗性能。
