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.
Chemosphere. 2020 Jul;251:126286. doi: 10.1016/j.chemosphere.2020.126286. Epub 2020 Feb 22.
Single-walled carbon nanotubes (SWNTs) can be used as 1D electrochemical disinfection material for point-of-use water treatment but are limited by their poor durability and possible cytotoxicity. Immobilizing SWNTs in nanofibers with electrospinning served as slow-release technology develop a novel with a lasting antibacterial and (eco-) toxicological alleviation of SWNTs. Hence, the single-walled carbon nanotubes-polyacrylonitrile/polyurethane/polyaniline (SWNTs-PAN/TPU/PANI, SPTP) composite electrospun nanofiber membrane was successfully fabricated by co-electrospinning process and the electrochemical filtration and disinfection system of point-of-use drinking water treatment is constructed. In the absence of electrolysis, the SPTP filter is effective for complete removal of bacteria by sieving mechanism. Concomitant electrolysis in the course of filtration results in significantly increased inactivation of sieved bacteria. Application of 3.0 V leads to complete (5 log) inactivation of bacteria within 20 min. 5-cycle experiments, membrane flux and shake flask tests prove that composite restrict the excessive release of SWNTs retaining the long-lasting antibacterial properties of SPTP membrane. At 1.0 and 2.0 V, electrolyte concentration and composition is irrelevant to electrochemical inactivation consistent with oxidation of SPTP filter. Bacterial reactive oxygen species (ROSs) also support an oxidation mechanism. At 3.0 V, electrochemical disinfection mainly relies on indirect oxidation.
单壁碳纳米管 (SWNTs) 可用作 1D 电化学消毒材料，用于现场水处理，但存在耐久性差和可能的细胞毒性问题。通过静电纺丝将 SWNTs 固定在纳米纤维中，作为缓释放技术，可以开发出具有持久抗菌作用和（生态）毒理学缓解 SWNTs 的新型材料。因此，通过共静电纺丝工艺成功制备了单壁碳纳米管-聚丙烯腈/聚四氟乙烯/聚苯胺 (SWNTs-PAN/TPU/PANI, SPTP) 复合电纺纳米纤维膜，并构建了现场饮用水处理的电化学过滤和消毒系统。在没有电解的情况下，SPTP 过滤器通过筛分机制有效去除细菌。在过滤过程中同时进行电解会导致筛分细菌的灭活率显著增加。施加 3.0 V 可在 20 分钟内使细菌完全失活（5 对数）。经过 5 个循环实验、膜通量和摇瓶测试证明，复合膜限制了 SWNTs 的过度释放，保持了 SPTP 膜持久的抗菌性能。在 1.0 和 2.0 V 下，电解质浓度和组成与 SPTP 过滤器的氧化无关，与电化学灭活一致。细菌活性氧 (ROS) 也支持氧化机制。在 3.0 V 下，电化学消毒主要依赖于间接氧化。
