Aliquat 336 担持多孔性中空糸膜の担持量と液透過性に及ぼす Aliquat 336 濃度と溶媒組成の効果 [in Japanese] Effects of Aliquat 336 Concentration and Solvent Composition on Amount of Aliquat 336 Impregnated and Liquid Permeability of Aliquat 336-Impregnated Porous Hollow-Fiber Membrane [in Japanese]
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A basic extractant Aliquat 336 dissolved in a mixture of water and ethanol was impregnated to carboxypentyl-amino (CPA)-group-containing polymer chains grafted onto a porous hollow-fiber membrane. The CPA group was introduced into the graft chain by a reaction of the epoxy group of poly-glycidyl methacrylate (GMA) chain grafted onto the porous hollow-fiber membrane with 6-aminohexanoic acid. The electrostatic interaction between the carboxyl moiety of the CPA group and the quarternary ammonium group of Aliquat 336 gave rise to a high-density impregnation of Aliquat 336. A higher water volume fraction in the mixture of water and ethanol used as a solvent of Aliquat 336 induced a higher extension of the graft chain, resulting in an increase in the amount of Aliquat 336 impregnated. In addition, a higher Aliquat 336 concentration produced a higher amount of Aliquat 336 impregnated. A water volume fraction of 0.33 and an Aliquat 336 concentration of 10% were selected on the basis of a trade-off between the amount of Aliquat 336 impregnated and the liquid permeability. The pure water flux of porous hollow-fiber membrane with 1.2 mol Aliquat 336 per kg GMA-grafted porous hollow-fiber membrane was 2.5 m/h at 0.1 MPa and 298 K. During the permeation of 100 mg-Pt/L platinum chloride solution (pH 4.0) through the pores of the Aliquat 336- impregnated porous hollow-fiber membrane, platinum complex ions (PtCl6 2–) were captured by Aliquat 336 impregnated to the graft chain, while the permeation pressure required for a constant flow rate increased. The breakthrough binding capacity of the Aliquat 336-impregnated porous hollow-fiber membrane for platinum was 0.37 mol per kg of the GMA-grafted porous hollow-fiber membrane.
MEMBRANE 32(3), 168-174, 2007
THE MEMBRANE SOCIETY OF JAPAN