基于纳米氧化锌/银改性的聚酰胺复合膜的制备及其协同抗菌性能

Preparation and synergistic antibacterial properties of thin-film composite membrane modified by nano-zinc oxide/silver particles

利用纳米氧化锌(ZnO-NPs)及银(Ag-NPs)共同改性聚酰胺复合(TFC)正渗透膜,通过优化传统TFC膜的水通量与反向盐通量之间的平衡,以显著提高膜的抗菌性能。首先对ZnO-NPs进行改性以提高其分散性,利用多巴胺(PDA)为中间载体,将纳米ZnO-NPs和Ag-NPs负载至TFC膜表面,考察了PDA的自聚合时间、ZnONPs添加量对膜性能的影响。结果表明,ZnO-NPs在最佳添加量条件下(0.75 g·L^(−1)),膜的J_(s)/J_(w)由初始状态的0.96降至0.25,优化了TFC膜的通量与反向盐通量的平衡关系。以大肠杆菌和金黄色葡萄球菌为代表的膜抑菌性能测试结果表明,Ag-NPs与ZnO-NPs在膜表面的协同抗菌作用,使ZnO@Ag/TFC膜对大肠杆菌和金黄色葡萄球菌的抑菌率分别高达84%和91%,显著提高了TFC膜的抗菌效果。以上研究结果对水处理技术发展具有重要意义。

In this study,the nano-particles(NPs)of zinc oxide(ZnO)and silver(Ag)were used to modify the polyamide thin-film composite(TFC)forward osmosis membrane for optimizing the balance between water flux and reverse salt flux,and improving the antibacterial property.Firstly,ZnO-NPs were modified to improve their dispersibility,the nanohybrid membranes were fabricated using dopamine(PDA)as the cross-linking material.The effects of PDA self-polymerization time and the ZnO-NPs dosage on the membrane performances were investigated.The results showed that the ratio of the reverse salt flux to the water flux(J_(s)/J_(w))decreased from 0.96 to 0.25 at the optimal ZnO-NPs dosage of 0.75 g·L^(−1),and the balance between water flux and reverse salt flux was optimized.The results of antibacterial performance represented by Escherichia coli(E.coli)and Staphylococcus aureus(S.aureus)showed that based on the synergistic antibacterial effect of Ag and ZnO-NPs on the membrane surface,the antibacterial rates of ZnO@Ag/TFC membrane against E.coli and S.aureus increased to 84%and 91%,respectively,which significantly promoted the antibacterial effect of TFC membrane.This research has great significance in the development of membrane material usage in water treatment process.