期刊
MEMBRANES
卷 12, 期 3, 页码 -出版社
MDPI
DOI: 10.3390/membranes12030250
关键词
PVDF; phase separation; porous membrane; filter; purification
类别
资金
- Ministry of Science and ICT of the Republic of Korea [SI2211-40, NRF-2020R1A2C2009666]
- Ministry of Trade, Industry & Energy (MOTIE) of the Republic of Korea [20009796, 20017410]
- Korea Evaluation Institute of Industrial Technology (KEIT) [20017410, 20009796] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
Membrane filtration process is widely used in various industries due to its high separation efficiency, simplicity and low cost. Highly porous PVDF membranes with a selective skin layer were developed using thermal-vapor assisted phase separation method, showing excellent ability to remove nanoparticle impurities in high-level purification processes.
The membrane filtration process is the most widely used purification process in various industries due to its high separation efficiency, process simplicity, and low cost. Although there is a wide range of membrane products with diverse materials and pore sizes on the market, there is a technological gap between microfiltration and ultrafiltration membranes. Here we developed highly porous polyvinylidene fluoride (PVDF) membranes with a selective skin layer with a pore size range of 20 to 80 nm by using a thermal-vapor assisted phase separation method. Porous and bi-continuous sublayers were generated from spinodal decomposition induced by cooling. The overall membrane structure and pore size changed with the dope composition, while the pore size and thickness of the selective skin layer were effectively controlled by water vapor exposure. The excellent nanoparticle removal efficiencies of the prepared PVDF membranes were confirmed, indicating their potential application in high-level purification processes to remove small trace organic or inorganic impurities from various industrial fluids.
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