| 摘要: |
| 通过引入亲水性添加剂是改善膜聚偏氟乙烯(PVDF)膜亲水性和膜结构的一种有效方法.在本研究中,利用氧化碳纳米管(O-MWNTs)和聚乙二醇(PEG)及聚乙烯吡咯烷酮(PVP)修饰PVDF膜.对添加剂对PVDF膜的结构、渗透性能、亲水性、结晶行为等影响进行了详细研究.结果表明:加入O-MWNTs可以提高PVDF膜的渗透通量、亲水性和机械性能.当铸膜液中添加0.6% O-MWNTs和5% PEG 200或者0.6% O-MWNTs和3% PVP时,所制PVDF膜渗透通量分别达到222.9±12.5 L·-2·h-1·bar-1和 256.9±14.8 L·m-2·h-1·bar-1.添加剂PEG200可以强化O-MWNTs的分散性,并能够促进相转化过程中溶剂与非溶剂间物质交换.PVP作为致孔剂能够促进孔生长和纯水通量提高. |
| 关键词: 聚偏氟乙烯膜 超滤 多壁碳纳米管 |
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| The effects of O-MWNTs,PEG and PVP additives on the performances of polyvinylidene fluoride(PVDF) membranes |
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XU Haipeng, CHEN Xingfan, ZHANG Xuan, LANG Wanzhong
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College of Life and Environmental Sciences,Shanghai Normal University
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| Abstract: |
| Introducing hydrophilic additives is an effective method to improve the structure and permeation performance of polyvinylidene fluoride (PVDF) membranes.In this work,oxidized multi-wall carbon nanotubes (O-MWNTs) accompanied with polyethylene glycol/polyvinyl pyrrolidone (PEG/PVP) additives were employed to modify PVDF membranes.The effects of additives on the structure,permeation performances,hydrophilicity and crystallization behavior of the prepared PVDF membranes were investigated in detail.The results indicate that the addition of O-MWNTs can enhance the permeation flux,hydrophilicity and mechanical property of PVDF membranes.The pure water flux(PWF) attains 222.9±12.5 L·m-2·h-1·bar-1 and 256.9±14.8 L·m-2·h-1·bar-1 by adding 0.6 wt.% O-MWNTs accompanied with 5% PEG 200 and 3% PVP in the cast solution,respectively.PEG200 additive can enhance the dispersion of O-MWNTs,and accelerate the exchange rate between solvent and non-solvent.PVP working as pore-forming agent promotes the growth of pores of PVDF membranes and pure water permeation flux. |
| Key words: polyvinylidene fluoride (PVDF) membrane ultrafiltration multi-wall carbon nanotubes (MWNTs) |
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