聚乙烯亚胺对反渗透复合膜抗菌性能的优化改性
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1.天津工业大学;2.天津城建大学

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天津市自然科学基金资助项目(18JCQNJC72400)


Optimization and Modification on Reverse Osmosis Composite Membrane for Antibacterial Performance by Polyethyleneimine
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    摘要:

    膜污染是制约膜快速发展的瓶颈之一,如何在源头上抑制微生物在膜表面的黏附和生长繁殖,已成为膜污染研究的热点之一。本文以聚砜超滤膜为支撑层,利用间苯二胺和三甲酰氯发生界面聚合反应,制备出聚酰胺反渗透复合膜。用聚乙烯亚胺(PEI)通过连续界面聚合法对反渗透膜进行抗菌性能优化改性。通过探究PEI反应参数对膜性能的影响,确定了优化改性的最佳参数,对改性膜的分子结构、表面性能以及膜性能进行了研究。结果表明,当PEI反应的质量分数为2%,反应时间为60 s,热处理为100 °C和5 min时,改性膜的性能最好。膜表面的亲水性和荷电性的双重提升有助于膜性能的提高。与原膜相比,所制备膜的截留率由96.6%提升至98.9%,水通量由35.7 L/(m2·h)增加到49.9 L/(m2·h);选用革兰氏阴性大肠杆菌和革兰氏阳性葡萄球菌对膜抗菌性能进行了评价,所制备的膜对2种细菌的抑菌率分别可达95.8%和96.3%,通过PEI改性实现了膜分离性能和抗菌性能的同步提升。

    Abstract:

    Membrane fouling is one of the bottlenecks restricting the rapid development of membranes. How to inhibit the adhesion and growth of microorganism on membrane surface from the source has become one of the hot spots in membrane fouling research. In this study, polyamide reverse osmosis composite membranes were prepared by interfacial polymerization of m-phenylenediamine and trimesoyl chloride using polysulfone ultrafiltration membrane as support layer. Polyethyleneimine (PEI) was used to optimize and modify the antibacterial performance of reverse osmosis composite membranes by sequential interfacial polymerization. The influence of PEI reaction parameters on membrane performance was investigated, and the optimal parameters were determined. The molecular structure, surface properties and membrane performances of the fabricated membranes were studied. The results show that when the mass fraction of PEI is 2%, the reaction time is 60 s, and the heat treatment is 100 °C for 5 min, the membrane has the best performance. The increasing of hydrophilicity and charge of membrane surface contribute to the improvement of membrane performance. Compared to the original membrane, the salt rejection of the prepared membranes is improved from 96.6% to 98.9% and the water flux is increased from 35.7 L/(m2·h) to 49.9 L/(m2·h). Gram-negative Escherichia coli and Gram-positive Staphylococcus were selected to evaluate the antibacterial properties of the membranes. The bacterial killing rate of the fabricated membranes against the two kinds of bacteria could reach 95.8% and 96.3% respectively, indicating that the separation and antibacterial performance could be improved simultaneously through the modification using PEI.

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历史
  • 收稿日期:2021-07-23
  • 最后修改日期:2021-11-08
  • 录用日期:2022-03-25
  • 在线发布日期: 2022-04-25
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