Abstract The bacteria and fungi captured on heat insulating materials or air filter media in the ventilation system in civil flights may reentrant into the indoor air which poses a threat to passengers’ health. The E. coli and B. subtilis bacteria survival rates on the heat insulating blankets typically used as padding materials inside the aircraft walls under the mimicked environmental condition were studied. Then the antibacterial performance of positively charged electret and chitosan modified filter media which can be used in the ventilation systems against E. coli bacteria was investigated. Our results showed that the E. coli survival rate deceased to less than 0.2% and that of the B. subtilis decreased to less than 2.1% of the control samples on the hydrophilic and hydrophobic blankets under the mimic conditions after one flight cycle. The survival rate of E. coli on the positively charged electret filter media decreased to less than 30% compared to the uncharged filter media after six hours due to the disruption of their metabolic balance by the positive charges on the fibers surface. Moreover, the E. coli survival rate on the pure nylon, nylon/chitosan and chitosan dipped nylon-6 nanofibrous filter media decreased to 8.4%, 7.1% and 2.8% after 120 min, respectively. This study sheds light on fabrication of the eco-friendly antibacterial filter materials for the ventilation systems.

中文翻译：

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带正电荷和壳聚糖浸渍空气过滤介质的抗菌性能

摘要 民用航班通风系统中的隔热材料或空气过滤介质上捕获的细菌和真菌可能会重新进入室内空气，对旅客健康构成威胁。研究了在模拟环境条件下通常用作飞机壁内填充材料的隔热毯上的大肠杆菌和枯草芽孢杆菌的存活率。然后研究了可用于通风系统的带正电荷驻极体和壳聚糖改性过滤介质对大肠杆菌的抗菌性能。我们的结果表明，在模拟条件下，在一个飞行周期后，大肠杆菌存活率下降至低于 0.2%，枯草芽孢杆菌的存活率下降至亲水和疏水毯上对照样品的 2.1% 以下。由于纤维表面的正电荷破坏了它们的代谢平衡，因此与不带电的过滤介质相比，带正电荷的驻极体过滤介质上的大肠杆菌的存活率在 6 小时后下降到不到 30%。此外，纯尼龙、尼龙/壳聚糖和壳聚糖浸渍尼龙 6 纳米纤维过滤介质上的大肠杆菌存活率在 120 分钟后分别下降至 8.4%、7.1% 和 2.8%。这项研究揭示了用于通风系统的环保抗菌过滤材料的制造。120 分钟后，纯尼龙、尼龙/壳聚糖和壳聚糖浸渍尼龙 6 纳米纤维过滤介质上的大肠杆菌存活率分别降至 8.4%、7.1% 和 2.8%。这项研究揭示了用于通风系统的环保抗菌过滤材料的制造。120 分钟后，纯尼龙、尼龙/壳聚糖和壳聚糖浸渍尼龙 6 纳米纤维过滤介质上的大肠杆菌存活率分别降至 8.4%、7.1% 和 2.8%。这项研究揭示了用于通风系统的环保抗菌过滤材料的制造。