Electrospun antibacterial poly(vinyl alcohol)/Ag nanoparticles membrane grafted with 3,3 ',4,4 '-benzophenone tetracarboxylic acid for efficient air filtration

In this study, poly(vinyl alcohol) (PVA) membranes containing Ag nanoparticles (AgNPs) were prepared by electrospinning and grafted copolymerization with 3,3',4,4'-benzophenone tetracarboxylic acid (BPTA) to provide better mechanical properties, lower water vapor transmittance, and higher antibacterial activity (against Staphylococcus aureus and Escherichia coli) than the PVA/AgNPs membrane. The PVA/AgNPs/BPTA membrane showed higher antibacterial activity than the other membranes, and it produced inhibition zones with diameters of 18.12 +/- 0.08 and 16.41 +/- 0.05 mm against S. aureus and E. coli, respectively. The PVA/AgNPs/BPTA membrane was found to be capable of promoting reactive oxygen species (ROS) formation under both light and dark conditions. Cycling experiments performed following ROS quenching showed that the best-performing composite membrane retained> 70% of its original OH center dot radical and H2O2 charging capacity after seven cycles. In the filtration test, the electrospun nanofibrous membranes showed high filtration efficiencies of 99.98% for sodium chloride (NaCl). In addition, these membranes maintained a relatively low pressure drop of 168 Pa with a basis weight of 2.1 g m(-2). Thus, the PVA/AgNPs/BPTA membrane was concluded to be a promising medical protective material offering the benefits of structural stability and reusability.

在这项研究中，通过静电纺丝并与3,3'，4,4'-二苯甲酮四羧酸（BPTA）接枝共聚制备了包含Ag纳米颗粒（AgNPs）的聚乙烯醇（PVA）膜，以提供更好的机械性能，与PVA / AgNPs膜相比，具有更高的水蒸气透过率和更高的抗菌活性（针对金黄色葡萄球菌和大肠杆菌）。 PVA / AgNPs / BPTA膜显示出比其他膜更高的抗菌活性，并且产生了分别对金黄色葡萄球菌和大肠杆菌的直径分别为18.12 +/- 0.08和16.41 +/- 0.05 mm的抑制区。发现PVA / AgNPs / BPTA膜能够在明亮和黑暗条件下促进活性氧（ROS）的形成。 ROS淬灭后进行的循环实验表明，性能最佳的复合膜在七个循环后保留了其原始OH中心点自由基和H2O2充电容量的70％以上。在过滤测试中，电纺纳米纤维膜对氯化钠（NaCl）的过滤效率高达99.98％。此外，这些膜的压降保持在168 Pa的较低水平，基重为2.1 g m（-2）。因此，PVA / AgNPs / BPTA膜被认为是一种有前途的医疗保护材料，具有结构稳定性和可重复使用性的优点。

Published: 2020

Journal ：APPLIED SURFACE SCIENCE

Impact Factor：6.386

Paper link: https://www.sciencedirect.com/science/article/abs/pii/S016943322032273X