Microstructure of PDA/PVDF ultrafiltration membranes under two pore-forming agents and comparison of their retention of organic dyes
In order to improve the pollution resistance of polyvinylidene fluoride (PVDF) ultrafiltration membrane to organic dyes, PVDF modified ultrafiltration membrane (PDA/PVDF membrane) was prepared by phase transformation method using polydopamine (PDA) as modifier, polyvinylpyrrolidone (PVP) and lithium...
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| Main Authors: | , , , , |
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| Format: | Article |
| Language: | zho |
| Published: |
Editorial Office of Journal of XPU
2024-12-01
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| Series: | Xi'an Gongcheng Daxue xuebao |
| Subjects: | |
| Online Access: | http://journal.xpu.edu.cn/en/#/digest?ArticleID=1515 |
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| Summary: | In order to improve the pollution resistance of polyvinylidene fluoride (PVDF) ultrafiltration membrane to organic dyes, PVDF modified ultrafiltration membrane (PDA/PVDF membrane) was prepared by phase transformation method using polydopamine (PDA) as modifier, polyvinylpyrrolidone (PVP) and lithium chloride (LiCl) as pore-forming agents, respectively. We studied the effects of PDA content on the microstructure, fracture strength, dye retention and pollution resistance of PDA/PVDF membrane prepared with two different pore-forming agents, and the permeation separation performance of PDA/PVDF membrane on neutral red, reactive brilliant orange K-NG and dispersed deep blue HGL. The results show that with the increase of PDA content, the pore structure of the membrane is improved, the average pore diameter of the PDA/PVDF membrane with PVP significantly increases, and the hydrophilicity of the membrane is significantly improved, and the contact Angle of the PDA/PVDF membrane with PVP decreases by 24.6%. The addition of PDA can greatly improve the pure water flux and dye retention rate of the PDA/PVDF membrane. The pure water flux of the PDA/PVDF membrane using PVP as the pore-forming agent is much greater than that of the PDA/PVDF membrane using LiCl as the pore-forming agent. The PDA/PVDF membrane using LiCl as the pore-forming agent has the better retention effect on the three dyes. The retention rate of disperse deep blue HGL can reach 87.05%. The addition of PDA can improve the anti-pollution performance of the membranes to some extent. The two kinds of pore-forming agent PDA/PVDF membranes have higher flux recovery rate for active orange K-NG. When the content of PDA is 1.6%, the flux recovery rate for active orange K-NG reaches 94.1%. |
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| ISSN: | 1674-649X |