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Polyvinylidene fluoride membrane functionalized with zero valent iron for highly efficient degradation of organic contaminants

机译：聚偏二氟乙烯膜用零价铁用于有机污染物的高效降解

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摘要

A hierarchical polyvinylidene fluoride (PVDF) membrane functionalized with catalytic zero valent iron nanoparticles via polydopamine/polyethyleneimine was successfully fabricated. The catalytic membrane exhibited excellent degradation performance for toxic 4-nitrophenol (4-NP), Rhodamine B (RB), and 2,4-dichlorophenol (2-CP). With a trace amount of H2O2 flowing over the surface of the catalytic membrane, highly active sites were monitored. The active surfaces generated a large amount of center dot OH radicals via decomposition of H2O2. The radicals unselectively oxidized a wide range of recalcitrant organic pollutants. Specifically, similar to 80% RB and almost 100% 4-NP and 2-CP were degraded within 30 min in aqueous solutions. Furthermore, total organic carbon analysis revealed that recalcitrant RB, 4-NP and 2-CP molecules could be partially mineralized into carbon dioxide and water inside the membrane. The degradation mechanism was related to a Fenton-like reaction. The catalytic membrane showed high regeneration ability with approximately 100% activity retention after four consecutive use cycles.
机译：通过多碳双胺/聚乙烯亚胺官能化的分层聚偏二氟乙烯（PVDF）膜通过多碳胺/聚乙烯亚胺官能化。催化膜表现出毒性4-硝基苯酚（4-NP），罗丹明B（RB）和2,4-二氯苯酚（2-CP）的优异降解性能。在催化膜表面上流动的痕量H 2 O 2，监测高活性位点。活性表面通过H 2 O 2的分解产生大量的中心点OH基团。自由基未经选类地氧化了各种核核的有机污染物。具体而言，在水溶液中类似于80％的Rb和几乎100％4-NP和2-CP在30分钟内降解。此外，总有机碳分析显示，克普尔伯克酸rB，4-NP和2-CP分子可以部分地矿化成膜内的二氧化碳和水。降解机制与芬顿的反应有关。催化膜显示出高再生能力，在连续四次使用循环后大约100％活性保留。

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