College of Chemical Engineering, Zhejiang University of Technology, Hangzhou 310014, China; Natural Sciences and Science Education, National Institute of Education, Nanyang Technological University, Singapore 637616, Singapore.
College of Chemical Engineering, Zhejiang University of Technology, Hangzhou 310014, China.
Water Res. 2024 Oct 1;263:122178. doi: 10.1016/j.watres.2024.122178. Epub 2024 Aug 2.
Membrane-contamination during electrodialysis (ED) process is still a non-negligible challenge, while irreversible consumption and unsustainability have become the main bottlenecks limiting the improvement of anion exchange membranes (AEMs) anti-contamination activity. Here, we introduce a novel approach to design AEMs by chemically assembling 4-pyndinepropanol with bromomethylated poly(2,6-dimethyl-1,4-phenylene oxide) (BPPO) in an electrochromic-inspired process. Subsequently, the co-mingled TiO@Ag nanosheet with the casting-solution were sprayed onto the surface of the substrate membrane to create a micrometer-thick interfacial layer. The addition of Ag nanoparticles (NPs) enhances the active sites of TiO, resulting in stronger local surface plasmon resonance (LSPR) effects and reducing its energy band gap limitation (From 3.11 to 2.63 eV). Post-electrodialysis electrochromic AEMs incorporating TiO@Ag exhibit synergistic enhancement of sunlight absorption, effectively suppressing photogenerated carrier binding and promoting migration. These resultant-membranes demonstrate significantly improved bacterial inhibition properties (42.0-fold increase for E. coli) and degradation activity (7.59-fold increase for rhodamine B) compared to pure TiO membranes. Importantly, they maintain photocatalytic activity without compromising salt-separation performance or stability, as the spraying process utilizes the same substrate materials. This approach to rational design and regulation of anti-contamination AEMs offers new insights into the collaborative synergy of color-changing and photocatalytic materials.
在电渗析（ED）过程中，膜污染仍然是一个不可忽视的挑战，而不可逆的消耗和不可持续性已成为限制阴离子交换膜（AEMs）抗污染活性提高的主要瓶颈。在这里，我们介绍了一种通过在电致变色启发过程中化学组装 4-吡啶丙醇与溴甲基化聚（2,6-二甲基-1,4-亚苯基氧化物）（BPPO）来设计 AEMs 的新方法。随后，将共混的 TiO@Ag 纳米片与铸膜液喷涂到基底膜的表面上，以形成一个微米厚的界面层。Ag 纳米颗粒（NPs）的添加增强了 TiO 的活性位点，导致更强的局域表面等离子体共振（LSPR）效应，并降低了其能带隙限制（从 3.11 到 2.63 eV）。在电渗析后进行电致变色的 AEMs 中，掺入 TiO@Ag 后，阳光吸收得到协同增强，有效抑制光生载流子结合并促进迁移。与纯 TiO 膜相比，这些膜表现出显著提高的细菌抑制性能（大肠杆菌增加了 42.0 倍）和降解活性（罗丹明 B 增加了 7.59 倍）。重要的是，它们在不损害盐分离性能或稳定性的情况下保持光催化活性，因为喷涂过程利用了相同的基底材料。这种对抗污染 AEMs 的合理设计和调控的方法为变色和光催化材料的协同作用提供了新的见解。
