Antifouling membranes prepared by electrospinning polylactic acid containing biocidal nanoparticles

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• 作者：Aravind Dasari^a ; ¹ ; Jennifer Quiró ; s^b ; Berta Herrero^a ; Karina Boltes^b ; Eloy Garcí ; a-Calvo^c ; Roberto Rosal^a ; ^c ; ^{roberto.rosal@uah.es}
• 关键词：Electrospinning ; Polylactic acid ; Membranes ; Biocidal nanoparticles ; Anti-biofouling
• 刊名：Journal of Membrane Science
• 出版年：2012
• 期刊代码：55_03767388
• 类别：ch
• 出版时间：1 July, 2012
• 卷：405-406
• 期：Complete
• 页码：134-140
• 文件大小：1585 K

摘要

We prepared non-woven electrospun polylactic acid (PLA) membranes containing functionalized sepiolite fibrillar particles (5 wt%). Biocidal activity was achieved by functionalizing sepiolite fibers with Ag (26 wt%) and Cu (26 wt%), which were embedded in the fiber surface. Sepiolite particles were negatively charged in all cases, with zeta potential in the range of 鈭?5 to 鈭?7 mV, increasing their negative charge with pH. The membranes were biofouled in a cross-flow filtration device using model biofoulants, cultures of Saccharomyces cerevisiae (pH 4.5) and Pseudomonas putida (pH 7.5), which were pumped across the membrane for 24/48 h. The assessment of active biomass was performed by measuring the concentration of adenosine-5鈥?triphosphate (ATP) in used membranes. The results showed a significant decrease in the amount of surface ATP for PLA loaded with Ag and Cu functionalized sepiolite. The effect was particularly intense for Ag-sepiolite in contact with Saccharomyces cerevisiae, where the reduction amounted to 85%compared to neat PLA (control). This was attributed to the differences in ion availability as a function of pH and to the presence of chloride ions in solution. Pristine sepiolite (without functionalization) did not show any noticeable effect.