State Key Laboratory of Polymer Physics and Chemistry, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun 130022, P. R. China.
School of Applied Chemistry and Engineering, University of Science and Technology of China, Hefei 230026, P. R. China.
ACS Nano. 2023 Feb 14;17(3):2932-2942. doi: 10.1021/acsnano.2c11339. Epub 2023 Feb 1.
Sunlight-driven photocatalytic filters against pathogenic bioaerosols have attracted a lot of interest. However, developing an efficient interception system that shows enhanced visible-light harvesting, controllable charge dynamic, and boosted ROS generation remains a grand challenge. Here, we designed an ionic ZIF-8@iCOF nanocomposite as a sunlight-driven photocatalytic filter through elaborate structural engineering of the heterointerface between ZIF-8 and cationic iCOF layers. The photoactive experiments reveal significant improvements in the visible light absorption and sunlight-driven exciton-enhanced intersystem crossing to boost the generation of singlet oxygen (220%) and also obtain antibacterial efficiency of 99.99999% after 15 min irradiation. After combining with commercial polymer, resultant ZIF-8@iCOF/polyacrylonitrile (PAN) fibrous membranes exhibited high interception efficiency for both PM and PM (98%), being close to the commercial N95. This fibrous membrane also possesses good biocompatibility and strong elimination of bacteria under sunlight conditions, satisfying for the long-lasting contact usage. This finding not only showcases the promise of the porous materials-based fibrous membranes for efficient photocatalytic filter against pathogenic bioaerosols but also highlights the importance of accurate structural engineering for the advancement of sunlight-driven photocatalytic systems in environment and energy-related fields.
阳光驱动的光催化过滤系统可以有效对抗致病生物气溶胶，因此受到了广泛关注。然而，开发高效的拦截系统仍然是一个巨大的挑战，该系统需要具备增强可见光吸收、可控电荷动力学和增强 ROS 生成的能力。在此，我们通过精心设计 ZIF-8 和阳离子 iCOF 层之间的异质界面，设计了一种离子 ZIF-8@iCOF 纳米复合材料作为阳光驱动的光催化过滤器。光活性实验表明，可见光吸收和阳光驱动的激子增强系间窜越显著提高，从而促进单线态氧的生成（提高 220%），并在 15 分钟照射后获得 99.99999%的抗菌效率。将 ZIF-8@iCOF 与商业聚合物结合后，所得的 ZIF-8@iCOF/聚丙烯腈（PAN）纤维膜对 PM 和 PM 的拦截效率均高达 98%，接近商业 N95 口罩。该纤维膜还具有良好的生物相容性和在阳光条件下的强杀菌能力，满足长期接触使用的要求。这一发现不仅展示了基于多孔材料的纤维膜在高效光催化过滤对抗致病生物气溶胶方面的应用前景，也突出了准确的结构工程对于推动阳光驱动光催化系统在环境和能源相关领域的发展的重要性。
