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Title: Membrane development for metal ions and anions separation
Authors: LU JUNWEN
Keywords: Membrane separation, Supported Liquid membrane, Nanofiltration membrane, Metal ions removal, Anions removal
Issue Date: 14-Feb-2008
Citation: LU JUNWEN (2008-02-14). Membrane development for metal ions and anions separation. ScholarBank@NUS Repository.
Abstract: The purpose of this research work is to develop a novel method to select carrier for supported liquid membrane systems to remove cadmium and to investigate the separation performance of a novel amphoteric PBI nanofiltration hollow fiber membrane for wastewater treatment. Theoretical prediction of the extraction capabilities for three kinds of carriers (Aliquat 336, Kelex 100 and LIX 54) for cadmium in supported liquid membrane (SLM) systems using the quantum chemical computation method has been carried out in this work. The single point energy calculation results show that the energy changes in the complex formation process are in the order of Aliquat 336/Cd(II) > Kelex 100/Cd(II) > LIX 54/Cd(II), with energy changes of -657.79, -329.19 and 96.32 kcal/mol, respectively. This research work indicate that quantum chemical computation can be proposed for carrier selection in supported liquid membrane (SLM) systems for heavy metal ions removal. Generally, the more negative energy change for the carrier/Cd(II) system indicates the more favorable process for the formation of the complex and consequently the better the extraction capability of the carrier. FTIR results also agree with the computational prediction quite well. The feasibility of the removal of both anions (phosphate, arsenate and borate ions) and cations (copper ions) by employing a novel amphoteric polybenzimidazole (PBI) nanofiltration (NF) hollow fiber membrane has also been investigated. The membrane structure, charge characteristics and ion rejection performance of the fabricated PBI NF hollow fiber membrane have been systematically studied. The surface charge characterization of PBI membranes indicate that the PBI NF membranes have an isoelectric point near pH 7.0 and therefore have different charge signs based on the media pH due to the amphoteric structure of imidazole group within PBI molecules. This unique charge characteristic makes the PBI membrane a good candidate for the removal of both cations and anions, where the PBI membrane exhibits different charge signs at adjustable pH.
Appears in Collections:Master's Theses (Open)

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