Xu Naiku, Ren Mengru
State Key Laboratory of Separation Membranes and Membrane Processes, College of Material Science and Engineering, Tiangong University, Tianjin 300387, China.
Polymers (Basel). 2021 May 13;13(10):1570. doi: 10.3390/polym13101570.
Polytetrafluoroethylene emulsion was ultrasonically mixed with an extremely spinnable poly(acrylic acid-co-hydroxyethyl methacrylate) solution to get a dispersion with good spinnability, and the obtained dispersion was then wet-spun into water-swellable fiber. Crosslinking agents and iron species were simultaneously introduced into the water-swellable fiber through simple impregnation and water swelling. A composite fiber with Fenton reaction-catalyzing function was then fabricated by sequentially conducting crosslinking and sintering treatment. Due to crosslinking-induced good resistance to water swelling and PTFE component-induced hydrophobicity, the composite fiber showed a highly stable activity to catalyze HO to oxidatively decolorize methylene blue (MB). Within nine cycles, the composite fiber could decolorize more than 90% of MB within one minute in the presence of HO and did not show any attenuation in MB decolorization efficiency. The composite fiber still could reduce the total organic carbon of MB aqueous solution from 18.3 to 10.3 mg/L when used for the ninth time. Therefore, it is believable that the prepared fiber has good and broad application prospects in the field of dye wastewater treatment.
将聚四氟乙烯乳液与极易纺丝的聚（丙烯酸 - 甲基丙烯酸羟乙酯）溶液进行超声混合，以获得具有良好可纺性的分散体，然后将所得分散体进行湿法纺丝制成水膨胀纤维。通过简单的浸渍和水溶胀将交联剂和铁物种同时引入到水膨胀纤维中。然后通过依次进行交联和烧结处理制备出具有芬顿反应催化功能的复合纤维。由于交联导致的良好的耐水溶胀性以及聚四氟乙烯组分导致的疏水性，该复合纤维对催化H₂O₂氧化亚甲基蓝（MB）褪色表现出高度稳定的活性。在九个循环内，该复合纤维在H₂O₂存在下一分钟内可使90%以上的MB褪色，并且MB脱色效率没有任何衰减。当第九次使用时，该复合纤维仍可将MB水溶液的总有机碳从18.3mg/L降低至10.3mg/L。因此，可以相信所制备的纤维在染料废水处理领域具有良好且广阔的应用前景。
