Microfiltration membranes modified by silver-decorated biomimetic silica nanopollens for mitigating biofouling: Synergetic effects of nanopollens and silver nanoparticles
Microfiltration membranes modified by silver-decorated biomimetic silica nanopollens for mitigating biofouling: Synergetic effects of nanopollens and silver nanoparticles
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银装饰仿生二氧化硅纳米花粉改性的微滤膜用于减轻生物污垢：纳米花粉和银纳米颗粒的协同效应
DOI：
10.1016/j.memsci.2019.117773
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发表时间：
2020-03
影响因子：
9.5
通讯作者：
Wang Zhiwei
中科院分区：
文献类型：
--
作者：
Zhang Xingran;Ping Meng;Wu Zhichao;Tang Chuyang Y.;Wang Zhiwei
膜技术在水和废水处理中的应用需要抗生物污染膜。受自然界花粉粒的尖刺拓扑特征的启发，我们开发了银修饰的仿生二氧化硅纳米花粉（SNP）来修饰聚偏氟乙烯微滤膜。与原始膜相比，改性膜表现出令人信服的抗生物污染性能，这归因于SNP和负载的银纳米颗粒的协同效应。SNPs的表面刺突可以作为多个“进入爪”，在接触时结合到细胞膜上，引起细胞的物理变形和代谢紊乱。更重要的是，SNP可以作为银离子的递送载体，所述银离子从装载在SNP中的银纳米颗粒释放，由于活性氧的产生和呼吸抑制而进一步导致细胞损伤。SNPs和负载银纳米颗粒的这些协同效应赋予改性膜在分批和连续流动测试中分别使用模式细菌大肠杆菌（革兰氏阴性）和金黄色葡萄球菌（革兰氏阳性）的有效抗生物污染行为。我们的策略提供了一种新的途径，使用仿生材料制造抗生物污染膜的水和废水处理。
Applications of membrane technologies for water and wastewater treatment call for antibiofouling membranes. Inspired by nature's spiky topological features of pollen grains, we developed silver-decorated biomimetic silica nanopollens (SNPs) to modify a polyvinylidene fluoride microfiltration membrane. The modified membrane demonstrated compelling antibiofouling performance compared to the pristine membrane, which was attributed to the synergetic effects of SNPs and loaded silver nanoparticles. The surface spikes of SNPs could act as multiple ‘entry claws’ to bind to the cell membrane upon contact, inducing physical deformation and metabolic disturbance of cells. More importantly, the SNPs could serve as a delivery vector for silver ions that were released from silver nanoparticles loaded in SNPs, further leading to cell damage due to the generation of reactive oxygen species and respiratory inhibition. These synergetic effects of SNPs and loaded silver nanoparticles imparted the modified membrane with potent antibiofouling behavior both in batch and continuous flow tests using model bacteria,Escherichia coli(Gram-negative) andStaphylococcus aureus(Gram-positive), respectively. Our strategy provides a novel pathway using biomimetic materials to fabricate antibiofouling membranes for water and wastewater treatment.
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