Polyvinylidene fluoride(PVDF)/polyurethane(PU)composite nanofiber membranes were prepared by mixing PVDF and PU at different mass ratios.The microstructure and the crystal structure of the composite nanofiber membrane...Polyvinylidene fluoride(PVDF)/polyurethane(PU)composite nanofiber membranes were prepared by mixing PVDF and PU at different mass ratios.The microstructure and the crystal structure of the composite nanofiber membranes were analyzed by scanning electron microscopy(SEM),Fourier transform infrared(FTIR)spectroscopy and X-ray diffraction(XRD).The hydrophilicity,mechanical properties and piezoelectric properties were also tested.Results showed that when the mass ratio of PVDF to PU was 9∶1,the fiber membrane had the best microstructure,and the crystal form of PVDF changed fromαcrystal toβcrystal in the electrospinning.The addition of PU improved the hydrophilicity,mechanical properties,and piezoelectric signal of the fiber membrane.When the mass ratio of PVDF to PU was 9∶1,the tensile strength reached the peak value of(10.39±0.41)N,and the output voltage reached the maximum value of(1.98±0.12)V.展开更多
传统的饮用水和废水处理技术对全氟化碳(PFCs)的去除存在一定的局限性。因此,需要一种先进的全氟化碳去除技术。以聚酯纤维(PET)为基材,采用不同的聚电解质[聚乙烯胺(PVAm)、β-环糊精改性的PVAm和季铵盐改性的PVAm]进行涂层处理,制备...传统的饮用水和废水处理技术对全氟化碳(PFCs)的去除存在一定的局限性。因此,需要一种先进的全氟化碳去除技术。以聚酯纤维(PET)为基材,采用不同的聚电解质[聚乙烯胺(PVAm)、β-环糊精改性的PVAm和季铵盐改性的PVAm]进行涂层处理,制备了吸附织物,用于去除地下水和工业废水中的PFCs。这种吸附用纺织品是用热轧的方法加工而得的,耐用、性能优良、成本效益可观。PVAm改性的PET对长链全氟碳化合物具有较高的吸附能力,而环糊精或季铵盐类化合物的改性,提高了PET对短链全氟碳化合物的选择性。采用1.5 m 3的中试装置对3种不同来源的受污染地下水进行现场试验。测试结果表明:来自杜塞尔多夫机场附近和在德国一家前纺织整理公司获得的受污染的地下水中的全氟化合物,分别减少了约95%的长链和85%的短链全氟化合物。此外,被短链全氟化碳高度污染的纸质污泥产生的地下水中的PFCs去除率略低。展开更多
基金Natural Science Foundation of Jiangsu Province,China(No.BK20190927)Postdoctoral Daily Program of Jiangsu Province,China(No.2019Z104)+2 种基金Natural Science Research Project of Xinglin College of Nantong University,China(No.2016K123)Student Innovation Training Project of Nantong University,China(No.2019111)Nantong University Scientific Research Fund,China(No.17R19)
文摘Polyvinylidene fluoride(PVDF)/polyurethane(PU)composite nanofiber membranes were prepared by mixing PVDF and PU at different mass ratios.The microstructure and the crystal structure of the composite nanofiber membranes were analyzed by scanning electron microscopy(SEM),Fourier transform infrared(FTIR)spectroscopy and X-ray diffraction(XRD).The hydrophilicity,mechanical properties and piezoelectric properties were also tested.Results showed that when the mass ratio of PVDF to PU was 9∶1,the fiber membrane had the best microstructure,and the crystal form of PVDF changed fromαcrystal toβcrystal in the electrospinning.The addition of PU improved the hydrophilicity,mechanical properties,and piezoelectric signal of the fiber membrane.When the mass ratio of PVDF to PU was 9∶1,the tensile strength reached the peak value of(10.39±0.41)N,and the output voltage reached the maximum value of(1.98±0.12)V.
文摘传统的饮用水和废水处理技术对全氟化碳(PFCs)的去除存在一定的局限性。因此,需要一种先进的全氟化碳去除技术。以聚酯纤维(PET)为基材,采用不同的聚电解质[聚乙烯胺(PVAm)、β-环糊精改性的PVAm和季铵盐改性的PVAm]进行涂层处理,制备了吸附织物,用于去除地下水和工业废水中的PFCs。这种吸附用纺织品是用热轧的方法加工而得的,耐用、性能优良、成本效益可观。PVAm改性的PET对长链全氟碳化合物具有较高的吸附能力,而环糊精或季铵盐类化合物的改性,提高了PET对短链全氟碳化合物的选择性。采用1.5 m 3的中试装置对3种不同来源的受污染地下水进行现场试验。测试结果表明:来自杜塞尔多夫机场附近和在德国一家前纺织整理公司获得的受污染的地下水中的全氟化合物,分别减少了约95%的长链和85%的短链全氟化合物。此外,被短链全氟化碳高度污染的纸质污泥产生的地下水中的PFCs去除率略低。
