温敏性抗污染纳滤膜的制备及性能表征
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摘要
膜污染是制约纳滤膜发展应用的关键问题之一,表面改性是提高纳滤膜抗污染性能的有效途径。利用溶液浸涂工艺,将具有合适低临界温度(LCST)值和亲水性的温敏性聚N-异丙基丙烯酰胺(PNIPAm)类功能材料涂覆于聚酰胺纳滤膜表面对其进行修饰,制备出一种温敏性抗污染纳滤膜。测试结果表明,改性后的纳滤膜抗污染性能明显提高,死端过滤试验持续运行32h,通量衰减率只有8.7%,通量恢复率可达98.4%。
Membrane fouling is one of the critical problems that restricts the de\velopment and applicat.ion of nanofiltration(NF)membranes. Surface modification has been proved to be an effective strategy to enhance anti-fouling properties of NF membranes.Herein, a kind of thermo-responsive polymers of PNIPAm with low critical solution temperature(LCST) is coated on the surface of commercial NF' membranes via method of dip-coating. By thus strategy, NF' membranes with thermo-responsibility and excellent anti-fouling properties are successfully fabricated. The testing result indicates that thus prepared NF membranes distinctly improve antifouling performance. In the testing period of 32 h by dead-end filtration, decline rate of thus prepared NF membranes is only 8.7 %,while the flux recovery rate is as high as 98.4%.
Membrane fouling is one of the critical problems that restricts the de\velopment and applicat.ion of nanofiltration(NF)membranes. Surface modification has been proved to be an effective strategy to enhance anti-fouling properties of NF membranes.Herein, a kind of thermo-responsive polymers of PNIPAm with low critical solution temperature(LCST) is coated on the surface of commercial NF' membranes via method of dip-coating. By thus strategy, NF' membranes with thermo-responsibility and excellent anti-fouling properties are successfully fabricated. The testing result indicates that thus prepared NF membranes distinctly improve antifouling performance. In the testing period of 32 h by dead-end filtration, decline rate of thus prepared NF membranes is only 8.7 %,while the flux recovery rate is as high as 98.4%.
引文
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[24]Zhang Yan,Su Yanlei,Chen Wenjuan,et al.A feasible posttreatment of drying and revetting for preparation of high-flux Pluronic F127/Polyethersulfone nanofiltration membranes[J].Industrial&Engineering Chemistry Research,2011,50(8):4678-4685.
[25]Huglin M B,Liu Y,Velada J L.Thermoreversible swelling behaviour of hydrogels based on N-isopropylacrylamide with acidic comonomers[J].Polymer,1997,38(23):5785-5791.
[2]Andrade L H,Mendes F D S,et al.Nanofiltration as tertiary treatment for the reuse of dairy wastewater treated by membrane bioreactor[J].Separation and Purification Technology,2014,126(15):21-29.
[3]Yu S C,Chen Z W,Cheng Q B,et al.Application of thin-film composite hollow fiber membrane to submerged nanofiltration of anionic dye aqueous solutions[J].Separation and Purification Technology.2012,88(2):121-129.
[4]Su Y L,Cheng W,Li C,et al.Preparation of antifouling ultrafiltration membranes with poly(ethylene glycol)-graft-polyacrylonitrile copolymers[J].Journal of Membrance Science,2009,329(1-2):246-252.
[5]Umar M,Patela D,Saha B.Kinetic studies of liquid phase ethyl tert-butyl ether(ETBE)synthesis using macroporous and geiular ion exchange resin catalysts[J].Chemical Engineering Science,2009,64(21):4424-4432.
[6]Asatekin A,Menniti A,Kang S,et al.Antifoiuling nanofiltration membranes for membrane bioreactors from self-assembling graft copolymers[J].Journal of Membrane Science,2006,285(1-2):81-89.
[7]Kang S,Asatekin A,Maycs A M,et al.Protein antifouling nechanisms of PAN UF membranes incorporating PAN-g-PEO additive[J].Journal of Membrane Science,2011,296(1-2):42-50.
[8]Paul M,Park H B,Freeman B D,et al.Synthesis and crosslinking of partially disulfonated poly(arylene ether sulfone)random copolymers as candidates for chlorine resistant reverse osmosis membranes[J].Polymer,2008,49(9):2243-2252.
[9]Misdan N,Lau W J,Ismail A F.Seawater reverse osmosis(SWRO)desalination by thin-film comlposite membrane-Current development,challenges and future prospects[J].Desalination,2012,287(3):228-237.
[10]Van T D,Yang C Y,Reinhard M,et al.Degradation of polyamide nanofiltration and reverse osmosis membranes by hypochlorite[J].Environmental Science and Technology,2012,46(2):852-859.
[11]Wei X Y,Wang Z,Chen J,et al.A novel method of surface modification on thin-film-composite membrane by grafting hydantoin derivative[J].Journal of Membrane Science,2010,346(1):152-162.
[12]周礼,鲁智勇,张熙.等.N-异丙基丙烯酰胺共聚物的温敏性[J].高分子材料科学与工程,2006,22(2):165-168
[13]谢锐,褚良银,陈文梅,等.聚N-异丙基丙烯酰接枝核孔膜微观结构及温敏响应特性[J].化工学报,2005.156(11):2212-2218.
[14]Xie R,Li Y,Chu L Y.Preparation of thermo-responsive gating membtrans with controllable response tempetature[J].Journal of Membrane Science,2007,289(1-2):76-85.
[15]Chu L Y,Xie R,Ju X J.Stimuli-responsive membranes:Smart tools for controllable mass-transfer and separation processes[J].Chinese Journal of Chemical Engineering,2011,19(6):891-903.
[16]Alema H,Duwez A S,Lussis P,et al.Demoustiser-champagne S.Microstructure and thermo-responsive behavior of poly(N-isopropylacrylamide)brushes grafeted in nanopores of track-etched membranes[J].Journal of Membrane Science,2008,308(1-2):75-86.
[17]Vertommcn M A M E,Cornelisscn H J L,Dietz C H J T,et al.Pore-covered thermo-responsive membranes for repeated on-demand drug release[J].Journal of Membrane Science,2008,322(1):243-248.
[18]邬迪华,朱碧文,俞三传.反渗透复合膜的表面特性及表面改性[J].水处理技术,2009,35(5):11-15.
[19]Wu D H,Liu X S,Yu S C,et al.Modification of aromatic polyamide thin-film composite reverse osmosis membranes by surface coating of thermo-responsive copolymera P(NIPAM-coAm)I:Preparation and Characterization[J].Journal of Membrane Science,2010,352(l-2):76-85.
[20]Liu M H,Wu D H,Yu S C,et al.Influence of the polyacyl chloride structure on the reverse osmosis performance,surface properties and chlorine stability of the thin film composite polyamide membranes[J].Journal of Membrane Science,2009,326(1):205-214.
[21]Zhang Y,Su Y L,Chen W J,et al.Appearance of poly(ethylene oxide)segments in the polyamide layer for antifouling nanofiltration membranes[J].Journal of Membrane Science,2011,328(1-2):300-307.
[22]吴宗策,蔡志奇,刘霞,等.低污染复合反渗透膜的生产方法:中国,CN200610051205.8[P].2007-03-07.
[23]具滋永,金淳植,洪成杓.耐污染性优良的选择分离膜的制造方法:中国,02126106.7[P].2004-01-21.
[24]Zhang Yan,Su Yanlei,Chen Wenjuan,et al.A feasible posttreatment of drying and revetting for preparation of high-flux Pluronic F127/Polyethersulfone nanofiltration membranes[J].Industrial&Engineering Chemistry Research,2011,50(8):4678-4685.
[25]Huglin M B,Liu Y,Velada J L.Thermoreversible swelling behaviour of hydrogels based on N-isopropylacrylamide with acidic comonomers[J].Polymer,1997,38(23):5785-5791.