Abstract

In this work, antibacterial and antifouling properties Polyvinylidene fluoride (PVDF) composite membranes were prepared via nonsolvent-induced phase separation of PVDF and Zn@TiO₂ blending. The Zn@TiO₂ nanoparticle was successfully prepared by the sol-gel method, and then Zn@TiO₂ was used to modify the PVDF membrane to obtain higher water flux and antibacterial and antifouling properties. The PVDF composite membrane was systematically characterized through a series of analysis techniques, such as scanning electron microscopy (SEM) and X-ray diffraction (XRD). In addition, the water contact angle, pure water flux, tensile strength, porosity, antibacterial property and stain resistance of the membrane have been studied. Escherichia coli and Staphylococcus aureus were used to evaluate the antibacterial performance of the membrane, and the BSA was selected as a model organic pollutant to study the antifouling performance of the membrane. Results show that the PVDF composite membranes have excellent antibacterial properties (nearly 100%), high permeability (up to 433.69 L m⁻² h⁻¹) and mechanical strength (enhanced by 26.5%). It can be used for possible complex high-protein wastewater treatment without facing serious biological pollution problems, and has broad application prospects.

摘要

_{在这项工作中，通过 PVDF 和 Zn@TiO 2}共混的非溶剂诱导相分离制备了具有抗菌和防污性能的聚偏氟乙烯 (PVDF) 复合膜。采用溶胶-凝胶法成功制备了Zn@TiO _{2纳米颗粒，然后用Zn@TiO 2}对PVDF膜进行改性以获得更高的水通量和抗菌防污性能。通过扫描电子显微镜（SEM）和X射线衍射（XRD）等一系列分析技术对PVDF复合膜进行了系统表征。此外，还研究了膜的水接触角、纯水通量、拉伸强度、孔隙率、抗菌性和耐污染性。大肠杆菌采用金黄色葡萄球菌和金黄色葡萄球菌对膜的抗菌性能进行评价，选择BSA作为模型有机污染物研究膜的防污性能。结果表明，PVDF复合膜具有优异的抗菌性能（接近100%）、高渗透性（高达433.69 L m ^-2  h ^-1）和机械强度（提高26.5%）。可用于可能的复杂高蛋白废水处理，且不会面临严重的生物污染问题，具有广阔的应用前景。