Xie Lixin, Liu Yaqian, Xu Shichang, Zhang Wen
School of Chemical Engineering and Technology, Tianjin Key Laboratory of Membrane Science and Desalination Technology, State Key Laboratory of Chemical Engineering Tianjin University, Tianjin 300350, China.
Membranes (Basel). 2023 May 19;13(5):530. doi: 10.3390/membranes13050530.
The surface modification of reverse osmosis (RO) membranes to improve their anti-biofouling properties is gaining increased attention. Here, we modified the polyamide brackish water reverse osmosis (BWRO) membrane via the biomimetic co-deposition of catechol (CA)/tetraethylenepentamine (TEPA) and in situ growth of Ag nanoparticles. Ag ions were reduced into Ag nanoparticles (AgNPs) without extraneous reducing agents. The hydrophilic property of the membrane was improved, and the zeta potential was also increased after the deposition of poly (catechol/polyamine) and AgNPs. Compared with the original RO membrane, the optimized PCPA3-Ag10 membrane showed a slight reduction in water flux, and the salt rejection declined, but enhanced anti-adhesion and anti-bacterial activities were observed. The of the PCPA3-Ag10 membranes during the filtration of BSA, SA and DTAB solution were 5.63 ± 0.09%, 18.34 ± 0.33% and 34.12 ± 0.15%, respectively, much better than those of the original membrane. Moreover, the PCPA3-Ag10 membrane exhibited a 100% reduction in the number of viable bacteria (B. subtilis and E. coli) inoculated on the membrane. The stability of the AgNPs was also high enough, and these results verify the effectiveness of poly (catechol/polyamine) and the AgNP-based modification strategy for the control of fouling.
为提高反渗透（RO）膜的抗生物污染性能而进行的表面改性正日益受到关注。在此，我们通过儿茶酚（CA）/四乙烯五胺（TEPA）的仿生共沉积和银纳米颗粒的原位生长对聚酰胺苦咸水反渗透（BWRO）膜进行了改性。银离子在没有额外还原剂的情况下被还原为银纳米颗粒（AgNPs）。在沉积聚（儿茶酚/多胺）和AgNPs后，膜的亲水性得到改善，zeta电位也有所增加。与原始RO膜相比，优化后的PCPA3-Ag10膜的水通量略有降低，脱盐率下降，但观察到其抗粘附和抗菌活性增强。PCPA3-Ag10膜在过滤牛血清白蛋白（BSA）、海藻酸钠（SA）和十二烷基三甲基溴化铵（DTAB）溶液期间的污染率分别为5.63±0.09%、18.34±0.33%和34.12±0.15%，远优于原始膜。此外，PCPA3-Ag10膜对接种在膜上的活菌（枯草芽孢杆菌和大肠杆菌）数量减少了100%。AgNPs的稳定性也足够高，这些结果验证了聚（儿茶酚/多胺）和基于AgNP的改性策略对控制污染的有效性。
