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|Title:||Polymeric asymmetric membranes made from polyetherimide/polybenzimidazole/poly(ethylene glycol) (PEI/PBI/PEG) for oil-surfactant-water separation|
|Authors:||Xu, Z.-L. |
|Source:||Xu, Z.-L., Chung, T.-S., Loh, K.-C., Lim, B.C. (1999-06-01). Polymeric asymmetric membranes made from polyetherimide/polybenzimidazole/poly(ethylene glycol) (PEI/PBI/PEG) for oil-surfactant-water separation. Journal of Membrane Science 158 (1-2) : 41-53. ScholarBank@NUS Repository. https://doi.org/10.1016/S0376-7388(99)00030-7|
|Abstract:||Using polyetherimide (PEI) as the membrane material and polybenzimidazole (PBI) and poly(ethylene glycol) (PEG 600) as the additives, we have studied the asymmetric hollow fiber membranes prepared from wet-spun 25wt% solids of 20:5:75 (wt ratio) PEI/PEG 600/DMAc and 19:1:5:75 PEI/PBI/PEG 600/DMAc solutions for oil-surfactant-water separation. We found that: (1) the addition of PBI in PEI/PEG dope solution resulted in the membrane morphology change from the finger-like structure to the spongy structure, and (2) bore fluid chemistry significantly affect the membrane permeability. Pure water permeation fluxes of 19:1:5 PEI:PBI:PEG 600 hollow fibers which used 97:3 DMAc:water solution as bore fluid were about 30-fold of that used water as bore fluid (62.7-71.5 vs. 1.8l/m2hbar). The former eliminated hydrodynamic resistance to water on the internal surface of hollow fiber membrane. For oil-surfactant-water emulsion systems (1600ppm surfactant of sodium dodecylbenzenesulfonate and 2500ppm oil of n-decane), experimental results illustrated that the rejection rates for surfactant, total organic carbon and oil were 51.4-79.1%, 83.1-92.7% and more than 99%, respectively. Based on the T(g) data, PEG existed in hollow fiber membranes and increased the hydrophilicity of membranes because all T(g) data were less than that of a neat PEI. In addition, using sodium hypochlorite (NaOCl) as a post-treatment agent for membranes did not show an improvement in membrane permeability, while the elongation at break of treated hollow fiber membranes decreased significantly. Copyright (C) 1999 Elsevier Science B.V.|
|Source Title:||Journal of Membrane Science|
|Appears in Collections:||Staff Publications|
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