School of Materials Science and Engineering, Ocean University of China, Qingdao 266100, China.
Open Studio for Marine Corrosion and Protection, Pilot National Laboratory for Marine Science and Technology (Qingdao), Qingdao 266100, China; Key Laboratory of Marine Chemistry Theory and Technology, Ministry of Education, Ocean University of China, Qingdao 266100, China.
J Colloid Interface Sci. 2023 Jul;641:619-630. doi: 10.1016/j.jcis.2023.03.078. Epub 2023 Mar 16.
Heterojunctions based on conjugated polymers (PHJs) are of promise as photocatalysts. Here, we fabricate the two-dimensional benzodithiophene (BDT) and thieno[2,3-f]benzofuran (TBF) based conjugated polymers/g-CN PHJs creatively using the symmetry-breaking strategy. PD1 and PD3 with the asymmetric backbone TBF have better crystallinity. Moreover, PD3 utilizing fluorinated benzotriazole as the electron acceptor unit possesses more compact π - π stacking and higher charge mobility. The conjugated polymer PD5 with asymmetric side chains in the donor unit BDT guarantees more efficient charge transfer in the corresponding PD5/g-CN PHJ while maintaining comparable light utilization rate. Consequently, PD5/g-CN shows the champion performance with photocatalytic sterilization rates reaching 99.1% and 97.3% for S. aureus and E. coli. Notably, the reaction rate constant for Rhodamine B degradation of PD5/g-CN is 8 times that of g-CN, a record high among conjugated polymers/g-CN. This study aims to reveal the structure - property correlation of asymmetric conjugated polymers/g-CN for potential photocatalysis applications.
基于共轭聚合物的异质结（PHJ）作为光催化剂具有很大的应用前景。在这里，我们创造性地采用非对称策略制备了二维苯并二噻吩（BDT）和噻吩[2,3-f]苯并呋喃（TBF）基共轭聚合物/g-CN PHJ。具有不对称骨架 TBF 的 PD1 和 PD3 具有更好的结晶性。此外，利用氟化苯并三唑作为电子受体单元的 PD3 具有更紧凑的π-π堆积和更高的电荷迁移率。在供体单元 BDT 中具有不对称侧链的共轭聚合物 PD5 可确保在相应的 PD5/g-CN PHJ 中实现更有效的电荷转移，同时保持可比的光利用率。因此，PD5/g-CN 表现出优异的光催化杀菌性能，对金黄色葡萄球菌和大肠杆菌的杀菌率分别达到 99.1%和 97.3%。值得注意的是，PD5/g-CN 对罗丹明 B 的降解反应速率常数是 g-CN 的 8 倍，在共轭聚合物/g-CN 中创下了纪录。本研究旨在揭示非对称共轭聚合物/g-CN 的结构-性能相关性，以期在潜在的光催化应用中得到应用。
