Journal
JOURNAL OF MEMBRANE SCIENCE
Volume 478, Issue -, Pages 105-116Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.memsci.2014.12.050
Keywords
Polyethersulfone; Zinc oxide; Nanospheres; Ultrafiltration membrane; Antifouling
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Funding
- National Natural Science Foundation of China [21306130]
- Major State Basic Research Development Program of China (973 Program) [2009CB623405]
- Science & Technology Pillar Program of Tianjin [10ZCKFSH01700]
- Program of Introducing Talents of Discipline to Universities [B06006]
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A new approach for fabricating polyethersulfone (PES)/ZnO ultraffltration membrane is demonstrated. Nano-ZnO coated with polyvinylpyrrolidone (PVP) was prepared using dimethylformamide (DMF) as the solvent. The obtained ZnO-DMF dispersion was blended as an additive to fabricate PES/ZnO membranes with wet phase separation. The structure and performance of PES/ZnO membranes were characterized by the evaluation of surface pore size, porosity, water contact angle, pure water flux, BSA rejection and filtration resistance. The overall effect of ZnO-DMF dispersion addition on the structure and performance of the membrane was investigated by contrast with pure PBS membrane. Compared with a pure PBS membrane, PES/ZnO membranes have higher surface pore size, pore density and porosity, as well as improved surface hydrophilicity. The water fluxes of PES/ZnO membranes increased by approximately 210% compared with the pure PBS membrane, with little change in BSA rejection. Besides, PES/ZnO membranes were also fabricated with different ZnO-DMF dispersions comprising a fixed content of PVP and different contents of nano-ZnO. The concrete contribution of nano-ZnO in ZnO-DMF dispersion on improving membrane performance was investigated by comparison with PES/PVP membrane. The results indicated that the incorporated nano-ZnO was favorable to the improvement of compaction resistance and antifouling property. The thermal stability of the PES/ZnO membranes was also improved compared to that of PES membrane. (C) 2015 Elsevier B.V. All rights reserved.
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