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- Title
Preparation of PVDF ultrafiltration membrane modified by gel microspheres and its oil fouling resistance.
- Authors
FU Wei-gui; LI Guo-xia; ZHAI Gao-wei; WU Jia-xin; LIU Huai-xiang; SUN Bao-shan; CHEN Xi
- Abstract
In view of the serious membrane fouling problem in the treatment of oil wastewater by ultrafiltration membrane, the polyvinylidene fluoride (PVDF) ultrafiltration membrane modified by gel microspheres was prepared. P(MAAc-co-MAAm) multi-hydrogen bonding self-assembled gel microspheres were synthesized by free-radical polymerization combined with vigorously stirring, and grafted on the surface of carboxylated PVDF membrane through intermolecular hydrogen bonding interactions. The particle size of microspheres was measured by dynamic light scattering particle size analyzer (DLS), the surface morphology of membranes was observed by scanning electronic microscopy (SEM) and atomic force microscopy (AFM), and the performances of membranes were characterized by contact angle test, underwater oil droplet adhesion test and oil-water emulsion filtration test. The results show that the average diameter of gel microspheres is about 248 nm. Water contact angle of the modified membrane is as low as 25.4 ° ± 1.5 °, and the modified membrane has excellent resistance to oil droplet adhesion underwater. The rejection rate of PVDF modified membrane prepared with 40 mL P(MAAc-co-MAAm) gel microspheres suspension to the N-hexane oil-water emulsion with an average particle size of 220 nm is as high as 99.8%. After four oil-water emulsion cycle tests, the flux recovery rate of the modified PVDF membrane is 85.2%, while the one of pure PVDF membrane is only 41.5%. It indicates that the modified PVDF membrane has excellent anti-fouling performance, and separation performance as well.
- Subjects
ULTRAFILTRATION; POLYVINYLIDENE fluoride; MICROSPHERES; CONTACT angle; HYDROGEN bonding interactions; ATOMIC force microscopy; FOULING
- Publication
Journal of Tiangong University, 2020, Vol 39, Issue 5, p22
- ISSN
1671-024X
- Publication type
Article
- DOI
10.3969/j.issn.1671-024x.2020.05.004