期刊
JOURNAL OF MEMBRANE SCIENCE
卷 499, 期 -, 页码 80-91出版社
ELSEVIER
DOI: 10.1016/j.memsci.2015.09.060
关键词
Silver nanoparticle; Polyamide thin film composite membrane; Reverse osmosis; Particle immobilization; Antibacterial property
资金
- Basic Science Research Program [NRF-2014R1A1A1003197]
- Future-based Technology Development Program through the National Research Foundation of Korea (NRF) - Ministry of Science, ICT & Future Planning [2014-060222]
- Korea Research Institute of Chemical Technology (KRICT) institutional program [KK 1502-000]
We present a new strategy to strongly and effectively immobilize silver nanoparticles (AgNPs) on polyamide thin film composite membranes to endow antibacterial activity. This method relies on the immobilization of relatively large silica particles (SiO2, similar to 400 nm in diameter), where AgNPs of similar to 30 nm in diameter are tightly and densely bound (AgNP@SiO2), on the membrane surface using cysteamine as a covalent linker. The formation of multiple Ag-S chemical bonds between a bumpy AgNP@SiO2 and the rough membrane surface provides a great leaching stability of AgNPs and AgNP@SiO2. AgNP@SiO2 particles were well distributed over the entire membrane surface without severe aggregation. The surface coverage of the membrane by AgNP@SiO2 was tuned by adjusting the deposition time and AgNP@SiO2 particle concentration. The AgNP@SiO2-immobilized membrane showed excellent antibacterial properties against Escherichia coli, Pseudomonas aeruginosa and Staphylococcus aureus, even with a relatively low particle coverage. Importantly, the separation performance (water flux and salt rejection) of the membrane was not impaired by particle immobilization. These beneficial effects are attributed mainly to the sparse and good distribution of AgNP@SiO2, which can reinforce the antibacterial activity of AgNPs while having a negligible impact on the hydraulic resistance. (C) 2015 Elsevier B.V. All rights reserved.
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