| 摘要: |
| 叔铵盐2-二甲氨基氯乙烷盐酸盐（DCH）作为季铵盐的前驱体，通过环氧氯丙烷接枝到氧化多壁碳纳米管（O-MWNTs）上，得到的季铵盐改性多壁碳纳米管（MWNTs）（即N+-MWNTs）作为添加剂加入铸膜液制备聚偏氟乙烯（PVDF）平板超滤膜（PVDF/N+-MWNTs膜）.场发射扫描电子显微镜（FESEM）用来观测不同的N+-MWNTs添加量对膜形貌的影响.结果表明，制得的PVDF/N+-MWNTs复合膜表面粗糙度明显减小，同时亲水性得到明显改善.在对牛血清白蛋白（BSA）的污染-清洗循环实验中，PVDF/N+-MWNTs复合膜相比于纯PVDF膜，纯水通量由110.5×10-5 L·m-2·h-1·Pa-1上升至197.4×10-5 L·m-2·h-1·Pa-1.此外，通量恢复率（FRR）明显提高，尤其在3次循环之后，对BSA的截留性能没有下降.在对大肠杆菌和金黄色葡萄球菌的抗菌实验中，PVDF/N+-MWNTs复合膜展现出优异的抑菌性，且在膜的抗菌性再生循环中，3次循环之后PVDF/N+-MWNTs复合膜的抑菌率依然维持在较高的水平. |
| 关键词: 聚偏氟乙烯（PVDF） 多壁碳纳米管（MWNTs） 抗菌性 抗污染 自清洁 |
| DOI：10.3969/J.ISSN.1000-5137.2020.02.002 |
| 分类号:TQ246.8 |
| 基金项目:上海市地方能力建设项目（14520502900） |
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| PVDF ultrafiltration membranes with superior antibacterial and self-cleaning properties by embedding quaternary ammonium functionalized MWNTs |
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YAN Xi, HUANG Yuanwei, LANG Wanzhong
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College of Chemistry and Materials Science, Shanghai Normal University, Shanghai 200234, China
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| Abstract: |
| 2-Dimethylaminoethyl chloride hydrochloride(DCH), a precursor of quaternary ammoniumsalt, was grafted onto oxidized multi-walled carbon nanotubes(O-MWNTs)by epichlorohydrin. The obtained quaternary ammonium functionalized MWNTs(N+-MWNTs) were added into casting solution to prepare polyvinylidene fluoride(PVDF) hybrid ultrafiltration membranes(PVDF/N+-MWNTs). Field emission scanning electron microscopy(FESEM)was used to observe the morphology. The results demonstrated that the surface roughness and hydrophilicity of PVDF/N+-MWNTs hybrid membrane were obviously improved.Besides, in the ultrafiltration-regeneration cycles with bovine serum albumin(BSA)as model biofoulant, the pure water permeation was improved from 110.5×10-5 to 197.4×10-5 L·m-2·h-1·Pa-1.Especially in the third cycle, the flux recovery ratio (FRR)was evidently improved.The prepared PVDF/N+-MWNTs hybrid membranes had excellent antibacterial efficacy against Escherichia coli and Staphylococcus aureus.Especially after three cycles, the antibacterial ratio remains high. |
| Key words: polyvinylidene fluoride(PVDF) multiwalled carbon nanotubes(MWNTs) antibacterial antifouling self-cleaning |
