Inhibition of bacterial adhesion on cellulose acetate membranes containing silver nanoparticles
Inhibition of bacterial adhesion on cellulose acetate membranes containing silver nanoparticles
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DOI：
10.1007/s10570-015-0752-6
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发表时间：
2015-12-01
期刊：
影响因子：
5.7
通讯作者：
Goncalves, Maria do Carmo
中科院分区：
文献类型：
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作者：
Andrade, Patricia Fernanda;de Faria, Andreia Fonseca;Goncalves, Maria do Carmo
膜污染是影响高分子膜性能的主要缺陷之一。生物污损具有一系列的影响，例如降低膜的渗透性、增加能量成本和缩短膜的寿命。通过将预合成的纳米粒子（平均直径为28 nm）分散在醋酸纤维素（CA）铸膜液中，制备了含有不同量的β-环糊精稳定的银纳米粒子（AgNP-beta-CD）的醋酸纤维素（CA）膜。通过相转化法制备了具有抗菌和抗生物污染性能的复合膜。通过X射线衍射检测了分散在CA膜中之前和之后的AgNP-β-CD的典型晶体结构。场发射电子显微镜图像显示膜具有指状形态，原子力显微镜图像显示在膜顶表面存在纳米颗粒。结果表明，AgNP-β-CD的存在不影响膜的热降解，但增加了通过膜的水通量。以大肠杆菌为实验对象，研究了含AgNP-β-CD（CA-Ag）膜的抗菌活性。coli和革兰氏阳性菌S.金黄色葡萄球菌（使用平板计数法）。结果表明，E. coli和革兰氏阳性菌S.金黄色葡萄球菌活细胞与CA-Ag膜接触12小时后受到抑制。此外，CA膜能够防止90%以上的E.大肠杆菌生物膜形成。结果表明，以AgNP-β-CD为载体制备的CA膜具有良好的抗生物污染性能，可用于水处理和废水回用。
Membrane fouling is one of the major drawbacks that changes polymeric membrane performance. Biofouling has a series of effects, such as to reduce membrane permeability, to increase energy costs and to decrease membrane lifetime. Cellulose acetate (CA) membranes, containing different amounts of beta-cyclodextrin stabilized silver nanoparticles (AgNP-beta-CD), were prepared by dispersing the pre-synthesized nanoparticle (28 nm mean diameter) in CA casting solution. These membranes were obtained by phase-inversion process, in order to achieve both antibacterial properties and biofouling resistance. The typical crystal structure of the AgNP-beta-CD, before and after being dispersed in CA membranes, was detected by X-ray diffraction. Field emission electron microscopy images showed membranes with finger-like morphology and atomic force microscopy images showed the presence of nanoparticles in the membrane top surface. The results indicated that the presence of AgNP-beta-CD did not influence the membrane thermal degradation but increased the water flux through the membrane. The antibacterial activity of the membranes containing AgNP-beta-CD (CA-Ag) was evaluated against E. coli and S. aureus using the plate count method. The results showed that almost 100 % of the E. coli and S. aureus viable cells were inhibited after 12 h of contact with CA-Ag membranes. In addition, the CA membranes were able to prevent more than 90 % E. coli biofilm formation. Based on the results, CA membranes prepared with AgNP-beta-CD can be potentially applied as anti-biofouling filtration membranes for water treatment and wastewater recovery.