PES/fMWNT共混超滤膜的制备及其抗污染研究
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摘要
采用非溶剂致相分离法(NIPS)制备聚醚砜/羧基化碳纳米管共混膜,以N,N-二甲基乙酰胺(DMAc)和N-甲基吡咯烷酮(NMP)为溶剂,聚乙二醇(PEG4000)为致孔剂。研究了碳纳米管添加量和管径对膜结构和膜性能的影响。结果表明,共混膜的拉伸强度、杨氏模量随着碳纳米管含量的增加先增大后减小,但随着碳纳米管的管径增加而减小。当碳纳米管含量为1. 0%,管径为20～30 nm时,聚醚砜/碳纳米管共混膜的接触角从纯聚醚砜膜的78. 16°降到64. 30°,纯水通量达到50. 39 L/(m~2·h),是纯聚醚砜通量的4倍,对牛血清蛋白(BSA)截留率保持在95%以上,通量恢复率从54. 29%增加到84. 59%,抗污染性能较纯聚醚砜膜明显提高。
The polyethersulfone( PES)/multiwalled carbon nanotubes( fMWNTs) blend membranes were prepared by non-solvent phase separation( NIPS) method,using N,N-dimethylacetamide( DMAc)and 1-methyl-2-pyrrolidinone( NMP) as solvents,polyethylene glycol( PEG4000) as pore-foaming agent.The effect of the addition content and diameter of carbon nanotubes on the structure and performance of PES/fMWNTs blend membranes was investigated. The results show that tensile strength and Young's modulus of the blend membranes increase with the increasing of carbon nanotube contents firstly and then decrease. However they would decrease with the increasing of the diameter of carbon nanotubes. When the content of carbon nanotube is 1. 0 wt%,and the diameter is 20 ～ 30 nm,the water contact angle of PES/fMWNTs blend membranes could change from the pure PES membrane of 78. 16° to 64. 30°. In addition,the pure water flux of the blend membranes could achieve 50. 39 L/( m~2· h),which is 4 times larger than the pure PES membranes. And the BSA rejection of PES/fMWNTs blend membranes is above 95% and the flux recovery ratio could raise from 54. 29% to 84. 59%. Comparing with the pure PES membranes, the anti-pollution performance of the blend membranes could be improved significantly.
The polyethersulfone( PES)/multiwalled carbon nanotubes( fMWNTs) blend membranes were prepared by non-solvent phase separation( NIPS) method,using N,N-dimethylacetamide( DMAc)and 1-methyl-2-pyrrolidinone( NMP) as solvents,polyethylene glycol( PEG4000) as pore-foaming agent.The effect of the addition content and diameter of carbon nanotubes on the structure and performance of PES/fMWNTs blend membranes was investigated. The results show that tensile strength and Young's modulus of the blend membranes increase with the increasing of carbon nanotube contents firstly and then decrease. However they would decrease with the increasing of the diameter of carbon nanotubes. When the content of carbon nanotube is 1. 0 wt%,and the diameter is 20 ～ 30 nm,the water contact angle of PES/fMWNTs blend membranes could change from the pure PES membrane of 78. 16° to 64. 30°. In addition,the pure water flux of the blend membranes could achieve 50. 39 L/( m~2· h),which is 4 times larger than the pure PES membranes. And the BSA rejection of PES/fMWNTs blend membranes is above 95% and the flux recovery ratio could raise from 54. 29% to 84. 59%. Comparing with the pure PES membranes, the anti-pollution performance of the blend membranes could be improved significantly.
引文
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[3]LI J F,XU Z L,YANG H.Microporous polyethersulfone membranes prepared under the combined precipitation conditions with non-solvent additives[J].Polym Adv Technol,2010,19(4):251-257.
[4]PHELANE L,MUYA F N,RICHARDS H L,et al.Polysulfone nanocomposite membranes with improved hydrophilicity[J].Electrochim Acta,2014,128(5):326-335.
[5]SAFARPOUR M,VATANPOUR V,KHATAEE A.Preparation and characterization of graphene oxide/Ti O2,blended PES nanofiltration membrane with improved antifouling and separation performance[J].Desalination,2016,393:65-78.
[6]KHALID A,IBRAHIM A,AL-HAMOUZ O C S,et al.Fabrication of polysulfone nanocomposite membranes with silver-doped carbon nanotubes and their antifouling performance[J].J Appl Polym Sci,2016,134(15):1-12.
[7]HOLT J K,PARK H G,WANG Y,et al.Fast mass transport through sub-2-nanometer carbon nanotubes[J].Science,2006,312(5776):1034-1037.
[8]HOLT J K,NOY A,HUSER T,et al.Fabrication of a carbon nanotube-embedded silicon nitride membrane for studies of nanometer-scale mass transport[J].Nano Lett,2004,4(11):2245-2250.
[9]SANG W K,KIM T,KIM Y S,et al.Surface modifications for the effective dispersion of carbon nanotubes in solvents and polymers[J].Carbon,2012,50(1):3-33.
[10]MAJEED S,FIERRO D,BUHR K,et al.Multi-walled carbon nanotubes(MWCNTs)mixed polyacrylonitrile(PAN)ultrafiltration membranes[J].J Membr Sci,2012,403-404(3):101-109..
[11]CELIK E,PARK H,CHOI H,et al.Carbon nanotube blended polyethersulfone membranes for fouling control in water treatment[J].Water Res,2011,45(1):274-282.
[12]QIU S,WU L,PAN X,et al.Preparation and properties of functionalized carbon nanotube/PSF blend ultrafiltration membranes[J].J Membr Sci,2009,342:165-172.
[13]VATSHA B,NGILA J C,MOUTLOALI R M.Preparation of antifouling polyvinylpyrrolidone(PVP 40K)modified polyethersulfone(PES)ultrafiltration(UF)membrane for water purification[J].Phys Chem Earth,2014,67:125-131.
[14]XU Z,WU T,SHI J,et al.Photocatalytic antifouling PVDF ultrafiltration membranes based on synergy of graphene oxide and Ti O2for water treatment[J].J Membr Sci,2016,520:281-293.
[15]SUN M,SU Y,MU C,et al.Improved antifouling property of PES ultrafiltration membranes using additive of silica PVP nanocomposite[J].Ind Eng Chem Res,2012,49(2):790-796.
[16]ZHANG X,WANG Y,LIU Y,et al.Preparation,performances of PVDF/Zn O hybrid membranes and their applications in the removal of copper ions[J].Appl Surf Sci,2014,316(1):333-340.
[17]QIU S,WU L,PAN X,et al.Preparation and properties of functionalized carbon nanotube/PSF blend ultrafiltration membranes[J].J Membr Sci,2009,342(1):165-172.
[18]BLANCO J F,SUBLET J,NGUYEN Q T,et al.Formation and morphology studies of different polysulfonesbased membranes made by wet phase inversion process[J].J Membr Sci,2006,283(1):27-37.
[19]VATANPOUR V,MADAENI S S,MORADIAN R,et al.Fabrication and characterization of novel antifouling nanofiltration membrane prepared from oxidized multiwalled carbon nanotube/polyethersulfonenanocomposite[J].J Membr Sci,2011,375(1):284-294.