Pore structure of gel chitosan membranes. III. Pressuredriven mass transport measurements |
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Affiliation: | 1. Key Laboratory of Marine Chemistry Theory and Technology, Ministry of Education, Ocean University of China, Qingdao 266100, PR China;2. Department of Civil Engineering, The University of Hong Kong, Pokfulam, Hong Kong, PR China |
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Abstract: | The capillary pore model of water-swollen gels was used to interpret pressure-driven mass transport properties of gel chitosan membranes. Pure water hydraulic permeability coefficients, Lp, and rejection coefficients, R, of 13 solutes ranging in molecular radius from 2.4 Å (methanol) to 16 Å (polyethylene glycol 6000) were measured for an untreated chitosan membrane, for two chitosan membranes crosslinked with glutaraldehyde of concentrations 0.01 and 0.1% and coated with a protein, and for comparison for a commercial Cuprophan membrane. Pore radii of the membranes were determined from these results by three methods: (1) Lp method that uses water hydraulic permeability coefficient, (2) σ method that uses reflection coefficients, and (3) P/Lp method that uses water diffusive permeability coefficient and water hydraulic permeability coefficient. |
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