College of Bioresources Chemical and Materials Engineering, Shaanxi University of Science and Technology, Shaanxi Provincial Key Laboratory of Papermaking Technology and Specialty Paper Development, Key Laboratory of Paper Based Functional Materials of China National Light Industry, National Demonstration Center for Experimental Light Chemistry Engineering Education, Xi'an 710021, China.
College of Bioresources Chemical and Materials Engineering, Shaanxi University of Science and Technology, Shaanxi Provincial Key Laboratory of Papermaking Technology and Specialty Paper Development, Key Laboratory of Paper Based Functional Materials of China National Light Industry, National Demonstration Center for Experimental Light Chemistry Engineering Education, Xi'an 710021, China.
Int J Biol Macromol. 2021 Mar 31;174:319-329. doi: 10.1016/j.ijbiomac.2021.01.184. Epub 2021 Jan 30.
Perfluorooctanoic acid (PFOA) has demonstrated potential toxicity to human health and has been detected in different environmental matrices due to its stable physical and chemical properties. To degrade PFOA under solar light irradiation, we fabricated a lignin/polyvinyl alcohol (PVA)/Co/Fe metal-organic frameworks (lignin/PVA/bi-MOFs) composite membrane via a typical electrospinning and in-situ solvothermal method for the catalytic degradation of PFOA. In the peroxymonosulfate (PMS)/membranes/solar light system, Electron paramagnetic resonance analysis (EPR) demonstrated the sulfate radicals (SO) and hydroxyl radicals (OH) were generated by activating PMS with transition metal and solar light irradiation. Lignin/PVA/bi-MOFs showed outstanding performance in that 89.6% of PFOA was degraded within 3 h under optimal conditions. Compared with that in solar light, only 59.6% PFOA was degraded in the dark, and the rate constant of PFOA degradation decreased from 0.0150 min to 0.0046 min. Moreover, lignin/PVA/bi-MOFs were reused after simply rinsing with ultra-pure water and the degradation capacity of lignin/PVA/bi-MOFs remained at 77% after 4 cycles. The results might provide a new concept for the design of bimetallic MOFs for applications in organic pollutant removal.
全氟辛酸（PFOA）已被证明对人类健康具有潜在毒性，并且由于其稳定的物理和化学性质，已在不同的环境基质中检测到。为了在太阳光照射下降解 PFOA，我们通过典型的静电纺丝和原位溶剂热法制备了一种木质素/聚乙烯醇（PVA）/Co/Fe 金属有机骨架（lignin/PVA/bi-MOFs）复合膜，用于 PFOA 的催化降解。在过一硫酸盐（PMS）/膜/太阳光系统中，电子顺磁共振分析（EPR）表明，通过过渡金属和太阳光照射激活 PMS 产生了硫酸根自由基（SO）和羟基自由基（OH）。木质素/PVA/bi-MOFs 在最佳条件下 3 小时内可将 89.6%的 PFOA 降解，表现出优异的性能。与太阳光相比，在黑暗中只有 59.6%的 PFOA 被降解，PFOA 降解的速率常数从 0.0150 min 降低到 0.0046 min。此外，木质素/PVA/bi-MOFs 只需用超纯水冲洗即可重复使用，并且木质素/PVA/bi-MOFs 的降解能力在 4 个循环后仍保持在 77%。结果可能为设计用于去除有机污染物的双金属 MOFs 提供了一个新概念。
