Abstract: Polyamide nanofiber mat was prepared by electrospinning and then conducted with the surface modification.Hydrophobic polyamide was selected due to high degree swelling of hydrophilic nanofibers in hydrographic environment damaged the strength and structural integrity of fiber.The technological parameter was adjusted to make the hydrophilic surface of nanofiber in order to enhance the water permeability and reduced the internal concentration polarization.The results showed that when the hydrolytic treatment conducted 30min,the surface of nanofiber presented hydrophilic and the internal structure as well as mechanical strength was intact.High water permeability and low structural coefficient was obtained in this way,meanwhile,the fiber swelling was avoid.
[1] Abu-Zeid E R,Zhang Y,Dong H,et al.A comprehensive review of vacuum membrane distillation technique[J].Desalination,2015,356:1-14. [2] Cath T Y,Childress A E,Elimelech M.Forward osmosis:principles,applications,and recent developments[J].Journal of Membrane Science,2006,281(1):70-87. [3] Ma N,Wei J,Qi S,et al.Nanocomposite substrates for controlling internal concentration polarization in forward osmosis membranes[J].Journal of Membrane Science,2013,441(15):54-62. [4] Yong J S,Phillip W A,Elimelech M.Coupled reverse draw solute permeation and water flux in forward osmosis with neutral draw solutes[J].Journal of Membrane Science,2012,392(2):9-17. [5] Breinig M,Mayer P,Harjung A,et al.Determination of a constant membrane structure parameter in forward osmosis processes[J].Journal of Membrane Science,2011,375(1):241-248. [6] Lay W C L,Liu Y,Fane A G.Impacts of salinity on the performance of high retention membrane bioreactors for water reclamation:a review[J].Water Research,2010,44(1):21-40. [7] Liu Q,Li J,Zhou Z,et al.Hydrophilic mineral coating of membrane substrate for reducing internal concentration polarization (ICP) in forward osmosis[J].Scientific Reports,2016,6(10):19593. [8] 曹鼎,付志峰,李从举.静电纺丝技术在过滤中的应用进展[J].化工新型材料,2011,39(8):15-18. [9] Song X,Liu Z,Sun D D.Nano gives the answer:breaking the bottleneck of internal concentration polarization with a nanofiber composite forward osmosis membrane for a high water production rate[J].Advanced Materials,2011,23(29):3256-3260. [10] Bui N N,Mccutcheon J R.Nanoparticle-embedded nanofibers in highly permselective thin-film nanocomposite membranes for forward osmosis[J].Journal of Membrane Science,2016,518:338-346. [11] 姚春梅,黄锋林,魏取福,等.静电纺聚乳酸纳米纤维复合滤料的过滤性能研究[J].化工新型材料,2012,40(4):122-124. [12] Huang L,Arena J T,Mccutcheon J R.Surface modified PVDF nanofiber supported thin film composite membranes for forward osmosis[J].Journal of Membrane Science,2016,499:352-360. [13] 陈兆文,范海明,管迎梅,等.部分水解PAN纤维的性能研究[J].舰船防化,2007(6):1-6. [14] Wei J,Qiu C,Tang C Y,et al.Synthesis and characterization of flat-sheet thin film composite forward osmosis membranes[J].Journal of Membrane Science,2011,372(1):292-302. [15] 徐强.水解条件对聚丙烯腈水解产物结构和性能的影响[D].济南:山东轻工业学院,2010.