Evolution of the precipitation kinetics, morphologies, permeation performances, and crystallization behaviors of polyvinylidenefluoride (PVDF) hollow fiber membrane by adding different molecular weight polyvinylpyrrolidone (PVP)

2010 ◽  
Vol 22 (12) ◽  
pp. 1720-1730 ◽  
Author(s):  
Wan-Zhong Lang ◽  
Ya-Jun Guo ◽  
Lian-Feng Chu
Keyword(s):  
Molecular Weight ◽  
Hollow Fiber ◽  
Hollow Fiber Membrane ◽  
Precipitation Kinetics ◽  
Fiber Membrane ◽  
Crystallization Behaviors ◽  
Different Molecular Weight

Polyacrylonitrile homogeneous blend hollow fiber membrane with stable structure as a substrate to support Fe/Mn oxide and its enhanced capability to purify dye wastewater

2020 ◽  
Vol 40 (6) ◽  
pp. 469-479
Author(s):  
Zhifen Hao ◽  
Naiku Xu ◽  
Yan Feng ◽  
Yu Chen ◽  
Changfa Xiao ◽  
...  
Keyword(s):  
Molecular Weight ◽  
High Molecular Weight ◽  
Removal Efficiency ◽  
Hollow Fiber ◽  
Hollow Fiber Membrane ◽  
Low Molecular Weight ◽  
Dye Wastewater ◽  
Fiber Membrane ◽  
Mn Oxide ◽  
Operation Pressure

AbstractBlending different molecular weight polyacrylonitrile (PAN) was adopted to solve the shrinkage problem of high molecular weight PAN hollow fiber membrane, to enhance the application performance of low molecular weight PAN membrane, and to adjust the porosity, pore size distribution, and hydrophilicity of the end product. The structurally-optimized membrane was chosen as a substrate to support Fe/Mn oxides and then used as a reactor to remove dyes from their solutions in the presence of H2O2. The results showed that the flux of methylene blue (MB) aqueous solution was 83.7 L/m2 h for the PAN homogeneous blend membrane, much higher than 29.1 L/m2 h of high molecular weight PAN membrane; MB removal efficiency was 97.3%, higher than 62.3% of low molecular weight PAN membrane, and it could be reused 25 times to remove dyes from their solutions without any loss in removal efficiency. The membrane was also found to have the application advantages of decreasing H2O2 dosage, reducing operation pressure, and raising MB removal efficiency compared with other membranes reported in the pieces of literature. Therefore, we were confident that the hollow fiber membrane fabricated by us would exhibit great application potential in the field of decontaminating dye wastewater.

Simulation of Oxygen Permeability of Dual-phase Hollow Fiber Membrane

2012 ◽  
Vol 27 (9) ◽  
pp. 951-955
Author(s):  
Chun-Li YANG ◽  
Qi-Ming XU ◽  
Ming GONG ◽  
Wei LIU
Keyword(s):  
Hollow Fiber ◽  
Oxygen Permeability ◽  
Hollow Fiber Membrane ◽  
Dual Phase ◽  
Fiber Membrane
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