Biogenic silver nanoparticles (bio-Ag⁰) decrease biofouling of bio-Ag⁰/PES nanocomposite membranes

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• 作者：Manying Zhang^a ; Kaisong Zhang^a ; ^{kszhang@iue.ac.cn} ; Bart De Gusseme^b ; Willy Verstraete^b
• 关键词：Biogenic silver ; Nanocomposite membrane ; Flux ; Hydrophilicity ; Silver loss ; Anti-biofouling
• 刊名：Water Research
• 出版年：2012
• 期刊代码：57_00431354
• 类别：civ
• 出版时间：1 May, 2012
• 卷：46
• 期：7
• 页码：2077-2087
• 文件大小：1534 K

摘要

Biofouling is a major problem for the application of membrane technology in water and wastewater treatment. One of the practical strategies to decrease biofouling is the use of advanced anti-biofouling membrane material. In this study, different amounts of biogenic silver nanoparticles (bio-Ag⁰) were embedded in polyethersulfone (PES) membranes, using the phase-inversion method. The effects of the bio-Ag⁰ content on the structure of the membrane and its filtration performance were systematically investigated. The results demonstrated that silver-containing nanostructures were uniformly distributed on membrane surface. Bio-Ag⁰ incorporation slightly increased the hydrophilicity of the PES membrane and increased the permeate flux. The anti-bacterial and anti-biofouling properties of the bio-Ag⁰/PES nanocomposites membrane were tested with pure cultures (Escherichia coli and Pseudomonas aeruginosa) and a mixed culture (an activated sludge bioreactor), respectively. The bio-Ag⁰/PES composite membranes, even with the lowest content of biogenic silver (140 mg bio-Ag⁰ m^鈭?), not only exhibited excellent anti-bacterial activity, but also prevented bacterial attachment to the membrane surface and decreased the biofilm formation during a 9 weeks test.