抽滤法制备PVDF/PVA复合纳滤膜的结构及性能评价
作者:韩璐,许振良,杨虎
单位: (华东理工大学化学工程研究所,上海 200237)
关键词: 纳滤;表面涂层;染料;交联;聚乙烯醇
分类号: TQ028
出版年,卷(期):页码: 2018,38(5):69-76

摘要:
 本文提供了一种制备无缺陷纳滤膜的新思路:使用抽滤法在自制的聚偏氟乙烯(PVDF)膜表面形成致密的聚乙烯醇(PVA)表层,然后以戊二醛(GA)为交联剂,盐酸(HCl)为催化剂交联PVA层,制备出具有不同截留性能的PVDF/PVA复合纳滤膜。结果表明:膜性能与PVA溶液的浓度、抽滤压力和时间密切相关。SEM 照片显示,部分 PVA 渗透到基膜内部,从而形成了无缺陷的致密表层结构。抽滤时间和压力显著影响PVA层厚度进而影响膜通量。AFM结果显示涂覆PVA后膜的表面更加光滑紧密。-0.1 bar压力下,抽滤1% PVA溶液10分钟,交联10分钟制备的膜性能最优,其对甲基蓝的截留率为93.5% ,通量达到14 L/(m2·h·bar),可以应用于染料废水处理。
 A dense polyvinyl alcohol (PVA) layer was firstly formed on the surface of PVDF membrane by vacuum filtration, then PVA was cross linked by glutaraldehyde (GA). The obtained PVA/PVDF membrane was tested in nanofiltration. SEM images showed PVA penetrated into the cross-section of the support membrane. A dense and flawless PVA skin layer was formed as revealed by AFM and SEM images. The thickness of PVA layer was influenced by the filtration time, pressure and PVA concentration as well. IR spectra and water contact angle proved the hydrophilic surface of the coated membrane. The nanofiltration experiments showed that a thick PVA layer leaded to a high rejection but a low flux. The optimized preparation condition was found to be 10 filtration minutes under -0.1 bar and cross-linking for 10 minutes. The obtained membrane showed the methyl blue rejection about 93.5%, and the water flux of 14 L/(m2·h·bar), which means that PVDF/PVA membrane can be used for dye removal in wastewater.

基金项目:

作者简介:
第一作者简介:韩璐(1992-),女,浙江余姚人,硕士生,研究方向为PVDF膜的亲水改性及应用,E-mail:Luhan92ecust@163.com 通信作者,E-mail:hyang@ecust.edu.cn

参考文献:
 [1]侯影飞,王金凤,刘敏.PVA/PEI复合纳滤膜的制备及性能优化[J].膜科学与技术,2015,36(6): 53-60.
[2]胥璐,雯丽,王剑,等.国产纳滤膜淡化高氟苦咸水基础研究[J].膜科学与技术,2015,35(1): 108-114.
[3]陈莹蕾,任月萍,李秀芬,等.TiO2 改性层厚度对PVDF-TiO2改性膜性能的影响[J].膜科学与技术,2018,38(1): 30-36.
[4]华峰,田秀枝,闫德东,等.二醛纤维素交联壳聚糖膜的制备及其染料吸附性能[J].功能高分子学报,2018,31(1): 82-87.
[5]Wu J, Huang X. Use of ozonation to mitigate fouling in a long-term membrane bioreactor[J]. Bioresource technology, 2010, 101(15): 6019-6027.
[6]Tang Y J, Xu Z L, Xue S M, et al. Improving the chlorine-tolerant ability of polypiperazine-amide nanofiltration membrane by adding NH2-PEG-NH2 in the aqueous phase[J]. Journal of Membrane Science, 2017, 538: 9-17.
[7]Tang Y J, Xu Z L, Xue S M, et al. A chlorine-tolerant nanofiltration membrane prepared by the mixed diamine monomers of PIP and BHTTM[J]. Journal of Membrane Science, 2016, 498: 374-384.
[8]Zhu W, Gao J, Sun S, et al. Poly(amidoamine) dendrimer (PAMAM) grafted on thin film composite (TFC) nanofiltration (NF) hollow fiber membranes for heavy metal removal[J]. Journal of Membrane Science, 2015, 487: 17-126. 
[9]Thong Z W, Gao Jie, Xi J, et al. Fabrication of loose outer-selective nanofiltration (NF) polyethersulfone (PES) hollow fibers via single-step spinning process for dye removal[J]. Separation and Purification Technology, 2018, 192: 483-490.
[10]LANG W Z, XU Z L, YANG H, et al. Preparation and characterization of PVDF–PFSA blend hollow fiber UF membrane [J]. Journal of Membrane Science, 2007, 1: 123-131.
[11] Xiang Y, Liu F, Xue L. Under seawater superoleophobic PVDF membrane inspired by polydopamine for efficient oil/seawater separation[J]. Journal of Membrane Science, 2015, 476: 321-329.
[12] Sun Y C, Rajabzadeh S, Fang L F. Poly(vinylidene difluoride)/poly (tetrafluoroethylene-co-vinylpyrrolidone) blend membranes with antifouling properties[J]. Materials Science and Engineering C, 2017, 75:79-87.
[13] M’barki O, Hanafia A, Bouyer D, et al. Greener Method to Prepare Porous Polymer Membranes by Combining Thermally Induced Phase Separation and Crosslinking of Poly(vinyl alcohol) in Water[J]. Journal of Membrane Science, 2014, 458:225-235.
[14] Zhang J, Wang Q Y, Zhu Z W, et al. Modification of Poly(vinylidene fluoride) /Polyethersulfone Blend Membrane with Polyvinyl Alcohol for Improving Antifouling Ability[J]. Journal of Membrane Science, 2014, 466:293-301.
[15] Hao J W, Wu Y H, Ran J, et al. A Simple and Green Preparation of PVA-based Cation Exchange Hybrid Membranes for Alkali Recovery[J]. J. Membr. Sci., 2013, 433:10-16.
[16] Du J R, Peldszus S, Huck P M, et al. Modification of Poly(vinylidene fluoride) Ultrafiltration Membranes with Poly(vinyl alcohol) for Fouling Control in Drinking Water Treatment[J]. Water Res. 2009,43:4559-4568.
[17] Li X P, Chen Y B, Hu X Y, et al. Desalination of dye solution utilizing PVA/PVDF hollow fiber composite membrane modified with TiO2 nanoparticles[J]. Journal of Membrane Science, 2014,471:118-129.

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