用二氧化硅和二氧化钛纳米颗粒功能化的聚酰胺电纺纳米纤维可高效去除染料

Safaa Saleh, Ahmed Salama, Ola M. Awad, Roberto De Santis, Vincenzo Guarino, Emad Tolba
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引用次数: 0

摘要

本研究以聚酰胺(PA6)为原料,制备了新型多功能电纺纳米纤维膜,膜中添加了二氧化硅(SiO2)和/或二氧化钛(TiO2)纳米粒子。首先制备了 SiO2 NPs,然后通过 TEM、FE-SEM 和 FTIR 以及 XRD 技术对其进行了表征,证实其形成了高纯度的嵴钙四边形晶体。研究了负载有 SiO2 NPs、TiO2 NPs 或同时负载有 SiO2 和 TiO2 NPs 的不同纳米纤维毡。形态学研究表明,SiO2 和 TiO2 纳米粒子倾向于沿着纤维表面排列,当它们混合到纳米纤维中时,还能促进锐钛矿纳米棒的形成。在最后一种情况下,机械测试表明,SiO2 的存在有助于平衡纤维的机械响应,而纤维的机械响应受到 TiO2 NPs 存在的负面影响--拉伸测试证实了这一点。更有趣的是,SiO2 的存在并未对不同细菌群(即大肠杆菌、肺炎克雷伯氏菌、金黄色葡萄球菌、枯草杆菌和白色念珠菌)的抗菌反应产生负面影响,这主要归因于 TiO2 粒子的存在。因此,与二氧化硅负载纤维(23 毫克/克)相比,TiO2- 和 TiO2/SiO2-loaded 纤维显示出更高的亚甲基蓝(MB)吸收值,即分别为 26 毫克/克和 27 毫克/克,其动力学与二阶动力学模型十分吻合。这些发现为新型抗菌膜的形成铺平了道路,有望用于水的净化。
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Polyamide Electrospun Nanofibers Functionalized with Silica and Titanium Dioxide Nanoparticles for Efficient Dye Removal
In this work, novel multifunctional electrospun nanofibrous membranes made of polyamide (PA6) and loaded with silica (SiO2) and/or titanium dioxide (TiO2) nanoparticles were fabricated. SiO2 NPs were first prepared and then characterized by TEM, FE-SEM, and FTIR, and by using XRD techniques, confirming the formation of cristobalite tetragonal crystals with high purity. Different nanofibrous mats, loaded with SiO2 NPs, TiO2 NPs, or both SiO2 and TiO2 NPs, were investigated. Morphological studies indicated that SiO2 and TiO2 nanoparticles tend to be arranged along the fiber surface, also promoting the formation of anatase nanorods when they are mixed into the nanofibers. In this last scenario, mechanical tests have demonstrated that the presence of SiO2 contributed to balancing the mechanical response of fibers that are negatively affected by the presence of TiO2 NPs—as confirmed by tensile tests. More interestingly, the presence of SiO2 did not negatively affect the antibacterial response against different bacteria populations (i.e., Escherichia coli, Klebsiella pneumonia, Staphylococcus aureus, Bacillus subtilis, and Candida albicans), which is mainly ascribable to the presence of TiO2 particles. Accordingly, the TiO2- and TiO2/SiO2-loaded fibers showed higher methylene blue (MB) absorption values—i.e., 26 mg/g and 27 mg/g—respectively, compared to the SiO2-loaded fibers (23 mg/g), with kinetics in good agreement with the second-order kinetic model. The obtained findings pave the way for the formation of novel antibacterial membranes with a promising use in water purification.
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