Key Laboratory of Songliao Aquatic Environment, Ministry of Education, Jilin Jianzhu University, Changchun, 130000, China.
State Key Laboratory of Separation Membranes and Membrane Processes, School of Environmental Science and Engineering, Tiangong University, Tianjin, 300387, China.
Chemosphere. 2023 Dec;345:140411. doi: 10.1016/j.chemosphere.2023.140411. Epub 2023 Oct 14.
In this study, hydrogels generated by the Schiff base reaction between citral and chitosan (CS) were used for the first time to improve the anti-bacterial property of forward osmosis (FO) membranes. The composite membranes were characterized by scanning electron microscopy (SEM), Fourier transform infrared (FTIR), Water contact angle (WCA), Zeta potential and confocal laser scanning microscopic (CLSM). In the FO filtration experiment, the membrane performance of TFC-1 with 1 M sodium chloride solution as the draw solution and deionized water as the feed solution was the best, with the water flux of 25.54 ± 0.7 L m h and the reverse salt flux of 4.7 ± 0.4 g m h. Although the hydrogel coating produced a certain hydraulic resistance, the flux of the modified membrane was only reduced by about 8%, compared with the unmodified membrane. However, the anti-bacterial property (Pseudomonas aeruginosa) and anti-fouling properties (bovine serum protein and lysozyme protein) of the modified membranes were improved, showing good antibacterial properties (99%) and flux recovery rate (over 90%). The modified method has the advantages of easy access to raw materials, simple operation and no risk of secondary pollution, which can effectively reduce the cost of chemical cleaning and extend the service life of the membrane. The modification of membrane by chitosan-based hydrogel is a promising option in the field of membrane anti-bacteria.
在这项研究中，首次使用柠檬醛与壳聚糖（CS）之间的席夫碱反应生成的水凝胶来提高正向渗透（FO）膜的抗菌性能。通过扫描电子显微镜（SEM）、傅里叶变换红外（FTIR）、水接触角（WCA）、Zeta 电位和共焦激光扫描显微镜（CLSM）对复合膜进行了表征。在 FO 过滤实验中，以 1M 氯化钠溶液为汲取液、去离子水为进料液的 TFC-1 膜的膜性能最佳，水通量为 25.54±0.7L·m-2·h-1，反向盐通量为 4.7±0.4g·m-2·h-1。尽管水凝胶涂层产生了一定的水力阻力，但与未改性膜相比，改性膜的通量仅降低了约 8%。然而，改性膜的抗菌性能（铜绿假单胞菌）和抗污染性能（牛血清蛋白和溶菌酶蛋白）得到了提高，表现出良好的抗菌性能（99%）和通量恢复率（超过 90%）。该改性方法具有原料易得、操作简单、无二次污染风险等优点，可有效降低化学清洗成本，延长膜的使用寿命。壳聚糖基水凝胶对膜的改性是膜抗菌领域很有前途的选择。
