The Key Lab of Pollution Control and Ecosystem Restoration in Industry Clusters, Ministry of Education, South China University of Technology, Guangzhou Higher Education Mega Centre, Guangzhou 510006, PR China; School of Civil Engineering and Transportation, South China University of Technology, Guangzhou 510640, PR China.
School of Environment and Energy, South China University of Technology, Guangzhou Higher Education Mega Centre, Guangzhou 510006, PR China; The Key Lab of Pollution Control and Ecosystem Restoration in Industry Clusters, Ministry of Education, South China University of Technology, Guangzhou Higher Education Mega Centre, Guangzhou 510006, PR China.
Sci Total Environ. 2018 Oct 1;637-638:408-417. doi: 10.1016/j.scitotenv.2018.05.012. Epub 2018 May 10.
The safety of drinking water remains a major challenge in developing countries and point-of-use (POU) drinking water treatment device plays an important role in decentralised drinking water safety. In this study, a novel material, i.e. a silver nanowires-polyacrylonitrile/thermoplastic polyurethane (AgNWs-PAN/TPU) composite membrane, was fabricated via electrospinning and vacuum filtration deposition. Morphological and structural characterisation showed that the PAN/TPU fibres had uniform diameters and enhanced mechanical properties. When added to these fibres, the AgNWs formed a highly conductive network with good physical stability and low silver ion leaching (<100 ppb). A POU device equipped with a AgNWs-PAN/TPU membrane displayed complete removal of 10 CFU/mL bacteria, which were inactivated by silver ions released from the AgNWs within 6 h. Furthermore, under a voltage of 1.5 V, the bacteria were completely inactivated within 20-25 min. Inactivation efficiency in 5 mM NaCl solution was higher than those in NaSO and NaNO solutions. We concluded that a strong electric field was formed at the AgNW tips. Additionally, silver ions and chlorine compounds worked synergistically in the disinfection process. This study provides a scientific basis for research and development of silver nanocomposite membranes, with high mechanical strength and high conductivity, for POU drinking water disinfection.
发展中国家的饮用水安全仍然是一个主要挑战，而现场（POU）饮用水处理设备在分散式饮用水安全中发挥着重要作用。在这项研究中，通过静电纺丝和真空过滤沉积法制备了一种新型材料，即银纳米线-聚丙烯腈/热塑性聚氨酯（AgNWs-PAN/TPU）复合膜。形态和结构特征表明，PAN/TPU 纤维具有均匀的直径和增强的机械性能。当将 AgNWs 添加到这些纤维中时，AgNWs 形成了具有良好物理稳定性和低银离子浸出（<100ppb）的高导电性网络。配备 AgNWs-PAN/TPU 膜的 POU 装置可完全去除 10CFU/mL 的细菌，这些细菌在 6 小时内被 AgNWs 释放的银离子灭活。此外，在 1.5V 的电压下，细菌在 20-25 分钟内完全被灭活。在 5mM NaCl 溶液中的灭活效率高于在 NaSO 和 NaNO 溶液中的灭活效率。我们得出结论，在 AgNW 尖端形成了强电场。此外，在消毒过程中，银离子和氯化合物协同作用。本研究为开发具有高强度机械性能和高导电性的用于 POU 饮用水消毒的银纳米复合材料膜提供了科学依据。
