Jiang Hong, Wang Jiarong, Liang Ying, Qiao Chuan
MOE Key Laboratory of Deep Earth Science and Engineering, College of Architecture & Environmental Engineering, Sichuan University, Chengdu 610065, China.
Molecules. 2024 Dec 5;29(23):5733. doi: 10.3390/molecules29235733.
For the removal of waterborne pathogens in remote areas and disaster emergency situations, point-source water treatment methods are more suitable. Photothermal sterilization is ideal for point-of-use (POU) systems, as it effectively eliminates pathogens without secondary pollution or bacterial resistance issues. By combining photothermal with membrane treatment, these membranes rapidly heat up under near-infrared (NIR) light, enabling both bacterial retention and sterilization. However, the decrease in membrane flux due to pore clogging during water treatment can significantly impact membrane efficiency. And adjusting the membrane pore size can significantly enhance flux recovery during cleaning, thereby restoring membrane efficiency. By synthesis multifunctional membranes that combine bacteria retention, sterilization, and flux recovery, it can meet the requirements of point-source water treatment: compact size, high efficiency, good safety, and easy maintenance. In this study, we developed an intelligent thermally responsive membrane (NIPAN@CNTs/PAN) by incorporating carbon nanotubes (CNTs) and forming a copolymer of N-isopropylacrylamide and polyacrylonitrile (NIPAN) coating into polyacrylonitrile membranes, offering dual functions of photothermal sterilization and self-cleaning. With 3% CNTs, the membrane achieves 100% sterilization within 6 min of NIR exposure, while the NIPAN layer's added roughness boosts photothermal efficiency, achieving 100% sterilization within 4 min. Rinsing at 50 °C improved flux recovery from 50% to 87% and reduced irreversible fouling from 49.7% to 12.9%, demonstrating stable performance over multiple cycles and highlighting its potential for long-term use in practical POU applications.
对于偏远地区和灾害应急情况下的水传播病原体去除，点源水处理方法更为适用。光热杀菌对于使用点（POU）系统来说是理想的，因为它能有效消除病原体，且不存在二次污染或细菌耐药性问题。通过将光热与膜处理相结合，这些膜在近红外（NIR）光下能快速升温，实现细菌截留和杀菌。然而，水处理过程中由于孔堵塞导致的膜通量下降会显著影响膜效率。而调整膜孔径能在清洗过程中显著提高通量恢复率，从而恢复膜效率。通过合成兼具细菌截留、杀菌和通量恢复功能的多功能膜，可满足点源水处理的要求：尺寸紧凑、效率高、安全性好且易于维护。在本研究中，我们通过将碳纳米管（CNTs）掺入聚丙烯腈膜中，并形成N - 异丙基丙烯酰胺与聚丙烯腈（NIPAN）的共聚物涂层，开发了一种智能热响应膜（NIPAN@CNTs/PAN），它具有光热杀菌和自清洁的双重功能。含有3%碳纳米管时，该膜在近红外照射6分钟内实现100%杀菌，而NIPAN层增加的粗糙度提高了光热效率，在4分钟内实现100%杀菌。在50°C下冲洗可将通量恢复率从50%提高到87%，并将不可逆污染从49.7%降低到12.9%，表明其在多个循环中性能稳定，突出了其在实际POU应用中长期使用的潜力。
