Yan Jiangyi, Nie Lihong, Li Guiliang, Zhu Yuanlu, Gao Ming, Wu Ruili, Wang Beifu
College of Petrochemical Engineering and Environment, Zhejiang Ocean University, Zhoushan 316000, China.
Sichuan Bureau of National Food and Strategic Reserves Administration, Chongqing 401326, China.
Membranes (Basel). 2022 Apr 24;12(5):458. doi: 10.3390/membranes12050458.
Improving the contamination resistance of membranes is one of the most effective ways to address the short service life of membranes. While preparing the membrane system structure, doping nanoparticles into the polymer matrix is beneficial to the preparation of high-performance membranes. To develop a new structure for membrane contamination protection, in this study, a novel asymmetric polyamide 66 composite ultrafiltration (UF) membrane was fabricated by incorporating different masses (ranging from zero to 0.5 wt.%) of graphene oxide (GO) into the polyamide 66 microporous substrate, using formic acid and propylene carbonate as solvents. The effects of GO doping on the morphology, microporous structure and surface of ultrafiltration membranes were investigated by atomic force microscopy (AFM), scanning electron microscopy (SEM), integrated thermal analysis (DSC) and contact angle (CA). In addition, pure water flux, bovine serum albumin (BSA) rejection and contamination resistance were measured to evaluate the filtration performance of different membranes. The overall performance of all the modified membranes was improved compared to pure membranes. The results of contact angle and permeation experiments showed that the addition of GO improved the hydrophilicity of the membrane, but reduced the permeability of the membrane. The minimum flux was only 3.5 L/m·h, but the rejection rate was 92.5%. Most noteworthy was the fact that GO further enhanced the anti-pollution performance of the membranes and achieved a remarkable performance of 91.32% when the GO content was 0.5 wt.%, which was 1.36 times higher than that of the pure membrane. Therefore, optimal performance was achieved. Furthermore, the UF membrane made of composite substrate offers a promising solution for the development of long-life ultrafiltration membranes with better stability, high-cost efficiency and adequate chemical durability.
提高膜的抗污染性能是解决膜使用寿命短问题的最有效方法之一。在制备膜系统结构时，将纳米颗粒掺杂到聚合物基质中有利于制备高性能膜。为开发一种用于膜污染防护的新结构，在本研究中，通过将不同质量（从零到0.5 wt.%）的氧化石墨烯（GO）掺入聚酰胺66微孔基材中，以甲酸和碳酸丙烯酯作为溶剂，制备了一种新型不对称聚酰胺66复合超滤（UF）膜。通过原子力显微镜（AFM）、扫描电子显微镜（SEM）、综合热分析（DSC）和接触角（CA）研究了GO掺杂对超滤膜形态、微孔结构和表面的影响。此外，测量了纯水通量、牛血清白蛋白（BSA）截留率和抗污染性能，以评估不同膜的过滤性能。与纯膜相比，所有改性膜的整体性能均得到改善。接触角和渗透实验结果表明，GO的添加提高了膜的亲水性，但降低了膜的渗透性。最小通量仅为3.5 L/m·h，但截留率为92.5%。最值得注意的是，GO进一步增强了膜的抗污染性能，当GO含量为0.5 wt.%时，抗污染性能达到了91.32%的显著水平，是纯膜的1.36倍。因此，实现了最佳性能。此外，由复合基材制成的超滤膜为开发具有更好稳定性、高成本效益和足够化学耐久性的长寿命超滤膜提供了一种有前景的解决方案。
