School of Textile and Material Engineering, Dalian Polytechnic University, Dalian, China.
School of Textile and Material Engineering, Dalian Polytechnic University, Dalian, China.
J Environ Manage. 2022 Sep 15;318:115643. doi: 10.1016/j.jenvman.2022.115643. Epub 2022 Jul 2.
Aiming at the synchronous elimination of heavy metals and organic contaminants from wastewater, the amidoxime functionalized PVDF-based chelating membrane was fabricated in this study. The structure and morphology of the chelating membrane were characterized using infrared spectroscopy (FT-IR), nuclear magnetic resonance spectrometer (NMR) and scanning electron microscopy (SEM). The SEM results show that the chemical modification with amidoxime groups did not damage the structure of the PVDF-based membrane. The chelating membrane has a high removal efficiency for Cu (77.33%) and Pb (79.23%) owing to the chemisorption through coordination bonds. However, the chelating membrane exhibits a low removal efficiency for Cd (29.88%) due to the physical adsorption. The chelating membrane has a high rejection efficiency of BSA (95.17%) and lysozyme (70.09%), which is attributed to the sieving effect and increased hydrophobicity. Furthermore, the membrane performance for simultaneously removing metals and proteins from simulated wastewater was examined. The interaction of metal ions with proteins (BSA and lysozyme) can enhance the ion removal efficiency of the chelated membrane, but decrease the protein rejection efficiency due to the destructive effect. The amidoxime functionalized PVDF-based chelating membrane has a high potential for application in wastewater treatment.
针对从废水中同步去除重金属和有机污染物的问题，本研究制备了偕胺肟功能化的聚偏氟乙烯基螯合膜。采用傅里叶变换红外光谱仪（FT-IR）、核磁共振波谱仪（NMR）和扫描电子显微镜（SEM）对螯合膜的结构和形貌进行了表征。SEM 结果表明，偕胺肟基团的化学修饰并未破坏基于 PVDF 的膜的结构。由于配位键的化学吸附，螯合膜对 Cu（77.33%）和 Pb（79.23%）具有很高的去除效率。然而，由于物理吸附，螯合膜对 Cd（29.88%）的去除效率较低。螯合膜对 BSA（95.17%）和溶菌酶（70.09%）具有很高的截留效率，这归因于筛分作用和疏水性的增加。此外，还考察了该膜从模拟废水中同时去除金属和蛋白质的性能。金属离子与蛋白质（BSA 和溶菌酶）的相互作用可以提高螯合膜的离子去除效率，但由于破坏作用会降低蛋白质的截留效率。偕胺肟功能化的聚偏氟乙烯基螯合膜在废水处理中有很高的应用潜力。
