Please use this identifier to cite or link to this item: http://scholarbank.nus.edu.sg/handle/10635/15374
Title: Fabrication and characterization of the ultrafiltration and nanofiltration membranes
Authors: WANG KAIYU
Keywords: Ultrafiltration, Nanofiltration, Membrane, Hollow fiber, Separation, Polybenzimidazole
Issue Date: 1-Jun-2006
Source: WANG KAIYU (2006-06-01). Fabrication and characterization of the ultrafiltration and nanofiltration membranes. ScholarBank@NUS Repository.
Abstract: Effects of flow angle within spinneret, shear rate and elongation rate during spinning on the morphology, permeability and separation performance of ultrafiltration hollow fiber membranes were investigated. Finger-like macrovoids in asymmetric hollow fibers can be suppressed and even eliminated under high shear stresses and elongational stresses. Two flat composite nanofiltration membranes were systematically characterized to obtain structural and electrical parameters through rejecting neutral molecules and electrolytes. A novel process was proposed for preparing polybenzimidazole nanofiltration membrane through chemically modifying the as-cast polybenzimidazole membrane with p-Xylylene dichloride. Based on the unique amphoteric property of polybenzimidazole, a novel nanofiltration hollow fiber membrane was fabricated by a one-step phase inversion process without post-treatment. The bore fluid composition had a crucial influence on the structure and performance of the resulting membranes. Applications of nanofiltration membranes in the fractionation of binary salt mixtures, the separation of cephalexin and the removal of chromate have been studied.
URI: http://scholarbank.nus.edu.sg/handle/10635/15374
Appears in Collections:Ph.D Theses (Open)

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