膜科学与技术

利用聚合多巴胺及PEG对PVDF中空纤维膜进行表面功能化的研究

作者：

1³⁵²⁹⁴ face="courier new">杨林明¹，李方¹，杜春慧²，黄礼超¹，朱运锋¹，杨波¹

单位： 1. 东华大学环境科学与工程学院，上海 201620；2. 浙江工商大学环境科学与工程学院，杭州 310035

关键词： PVDF中空纤维膜；多巴胺；亲水改性；乳化油

出版年,卷(期):页码： 2014,34(3):23-29

摘要：

通过涂覆多巴胺对PVDF中空纤维膜进行亲水改性，并利用聚合多巴胺(PDOPA)的强附着性进一步进行氨基聚乙二醇(mPEG-NH2)接枝改性，实现微滤膜表面功能化。试验研究了不同反应条件下涂覆和接枝效果，并以乳化油废水进行过滤对比分析。实验结果表明，经过480min多巴胺涂覆改性，PVDF中空纤维膜亲水性能提高，接触角由原膜的84.9?降低为50.1?，膜表面水滴渗透速度加快；涂覆时间影响膜的纯水通量，30min涂覆时间，纯水通量较原膜提高6.4%；过滤乳化油废水时，改性后的膜通量衰减速率减缓，稳定通量增加，抗污染性能提高。在PDOPA涂覆改性膜基础上进行mPEG-NH2接枝后，亲水性进一步提高，乳化油去除率提高13%。通过多巴胺涂覆与mPEG-NH2接枝，均有效提高了PVDF中空纤维膜在处理乳化油方面的性能。

Polydopamine (PDOPA) deposition was used in this study to improve the surface hydrophilicity of the PVDF hollow-fiber membrane. In further, mPEG-NH2 was grafted on the PDOPA layer through the adhesion of PDOPA to functionalize the membrane surface. The effect of PDOPA deposition and PEG grafting was compared under various reaction condition, and the separation efficiency of oil/water emulsion was used to evaluate the performance of modified membranes. The results showed that the PDOPA modified PVDF hollow-fiber membrane increased in hydrophilicity after 480 min of dopamine deposition, the contact angle reduced from 84.9?to 50.1?, and the water penetration rate into membrane increased. Deposition time of PDOPA affected the pure water flux, with flux increasing 6.4% after 30 min of deposition. A lower decreasing rate of flux, a higher steady-state flux and a more excellent anti-fouling were observed for modified membranes during filtration of an oil/water emulsion. The PDOPA modified membranes got a further improvement in hydrophilicity after grafting mPEG-NH2, and the rejection of oil/water emulsion increased 13%. The results show that both the PDOPA modification and mPEG-NH2 grafting improve the PVDF hollow-fiber membrane performance in the treatment of oil/water filtration effectively.

杨林明(1988-)，男，山东烟台人，硕士研究生，从事膜法水处理研究，E-mail: ylmdhu@126.com;

参考文献：

[1]王湛, 周翀. 膜分离技术基础[M]. 北京: 化学工业出版社, 2006: 1-3.
[2]罗子安, 魏俊富, 赵孔银, 等. 辐照接枝改性对PVDF中空纤维膜性能的影响[J].天津工业大学学报, 2012, 31(3):6-10.
[3]王海芳, 王连军, 于文敦, 等. 改性聚偏氟乙烯膜的性能表征[J].应用基础与工程学学报, 2005, (10):188-191.
[4]吕晓龙, 韩殉, 马世虎. 聚偏氟乙烯中空纤维膜的改性研究[J]. 天津工业大学学报, 2004, 23(4):24-27.
[5]邸玉静, 张学俊, 赵劲彤. 聚偏氟乙烯接枝3-苯基丙烯酸的改性研究[J]. 膜科学与技术, 2011, 31(1):47-50.
[6]韩殉, 黎雁, 吕晓龙. 聚偏氟乙烯中空纤维膜化学接枝改性研究[J]. 膜科学与技术, 2007, 27(2):15-19.
[7]Haeshin Lee, Shara M. Dellatore, William M. Miller, etal. Mussel-Inspired Surface Chemistry for Multifunctional Coatings[J]. Science, 2007, 318: 426-430.
[8]Jiang J H, Zhu L P, Li X L, etal. Surface modification of PE porous membranes based on the strong adhesion of polydopamine and covalent immobilization of heparin[J]. Journal Membrane Science, 2010,364:194-202.
[9]Li-Ping Zhu, Jing-Zhen Yu, You-Yi Xu, etal. Surface modification of PVDF porous membranes via poly(DOPA) coating and heparin immobilization[J].Colloids and Surfaces B: Biointerfaces 69(2009) 152-155.
[10]奚振宇, 徐又一, 朱利平, 等. 多巴胺对聚乙烯膜表面改性研究[J]. 膜科学与技术, 2008(12):新膜过程研究与应用研讨会论文集.
[11]Daniel R. Dreyer, Daniel J. Miller, Benny D. Freeman, etal. Elucidating the Structure of Poly(dopamine)[J]. Langmuir. 2012, 28, 6428−6435.
[12]徐又一, 蒋金泓, 朱利平, 等. 多巴胺自聚-附着行为与膜表面功能化[J]. 膜科学与技术, 2011, 3(3):32-38.
[13]Bryan D. McCloskey, Ho Bum Park, Hao Ju, etal. Influence of polydopamine deposition conditions on pure water flux and foulant adhesion resistance of reverse osmosis, ultrafiltration, and microfiltration membrane[J]. Polymer 51 (2010) 3472-3485.
[14]吕晓龙. 中空纤维多孔膜性能评价方法探讨[J]. 膜科学与技术, 2011, 31(2):1-6.
[15]Jason T. Arena, Bryan McCloskey, Benny D. Freeman, etal. Surface modification of thin film composite membrane support layers with polydopamine: Enabling use of reverse osmosis membranes in pressure retarded osmosis[J]. Journal of Membrane Science 375 (2011) 55-62.
[16]Zhen-Yu Xi, You-Yi Xu, Li-Ping. Zhu, etal. A facile method of surface modification for hydrophobic polymer membranes based on the adhesive behavior of poly(DOPA) and poly(dopamine)[J]. Journal of Membrane Science, 327 (2009) 244–253.
[17]Sirirat Kasemest, Albert Lee, Daniel J. Miller, Benny D. Freeman, etal. Effect of polydopamine depositions on fouling resistance, physical properties, and permeation properties of reverse osmosis membranes in oil/water separation[J].Journal of Membrane Science, (2013)208-216.
[18]赵翌帆, 朱利平, 徐又一, 等. 高分子超/微滤膜的亲水化改性:从PEG化到离子化[J]. 功能材料, 2011, 42(2):193-197.

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