Institute of Polymer Science and Engineering, Hebei University of Technology, Tianjin, 300130, P. R. China.
Department of Materials Engineering, North China Institute of Aerospace Engineering, Langfang, 065000, P. R. China.
Chem Asian J. 2019 Apr 1;14(7):1066-1075. doi: 10.1002/asia.201801785. Epub 2019 Mar 1.
PDMAEMA-b-PMAA block copolymers were prepared by the sequential RAFT polymerization of DMAEMA and tBMA, followed by hydrolysis. Phosphotungstic acid (HPW) was anchored to the PDMAEMA blocks through electrostatic interactions and the as-obtained HPW/PDMAEMA-b-PMAA was added to the synthesis of ZIF-8. During the formation of ZIF-8, the PMAA blocks coordinated to the Zn ions through their carboxy groups, along with the HPW groups that were anchored to the PDMAEMA blocks. In this way, the block copolymer could consolidate the interactions between HPW and ZIF-8 and prevent the leakage of HPW. Finally, the HPW/PDMAEMA-b-PMAA/ZIF-8 ternary lamellar composite was obtained and the structure of the HPW/PDMAEMA-b-PMAA/ZIF-8 hybrid material was characterized by using powder X-ray diffraction (PXRD), X-ray photoelectron spectroscopy (XPS), and scanning electron microscopy (SEM). As a photocatalyst, the HPW/PDMAEMA-b-PMAA/ZIF-8 ternary lamellar composite showed excellent photoactivity for the degradation of methylene blue (MB). The rate of degradation of MB was 0.0240 min , which was 7.5-times higher than that of commercially available P25 (0.0032 min ). In the presence of H O , the kinetic degradation parameters of the composite reached 0.0634 min , which was about 19.8-times higher than that of P25.
PDMAEMA-b-PMAA 嵌段共聚物通过 DMAEMA 和 tBMA 的顺序 RAFT 聚合制备，然后进行水解。通过静电相互作用将磷钨酸（HPW）锚定到 PDMAEMA 嵌段上，并将所得的 HPW/PDMAEMA-b-PMAA 添加到 ZIF-8 的合成中。在 ZIF-8 的形成过程中，PMAA 嵌段通过其羧基与 Zn 离子配位，同时锚定在 PDMAEMA 嵌段上的 HPW 基团。通过这种方式，嵌段共聚物可以增强 HPW 和 ZIF-8 之间的相互作用，并防止 HPW 的泄漏。最后，得到了 HPW/PDMAEMA-b-PMAA/ZIF-8 三元层状复合材料，并通过粉末 X 射线衍射（PXRD）、X 射线光电子能谱（XPS）和扫描电子显微镜（SEM）对 HPW/PDMAEMA-b-PMAA/ZIF-8 杂化材料的结构进行了表征。作为光催化剂，HPW/PDMAEMA-b-PMAA/ZIF-8 三元层状复合材料对亚甲基蓝（MB）的降解表现出优异的光活性。MB 的降解速率为 0.0240 min ，是市售 P25（0.0032 min ）的 7.5 倍。在 H O 的存在下，复合材料的动力学降解参数达到 0.0634 min ，约是 P25 的 19.8 倍。
