Effect of quaternary ammonium salts on carrier-mediated transport of lanthanide ions through cellulose triacetate membranes
- National Chemical Lab. for Industry, Ibaraki (Japan)
Fluxes of all lanthanides, except promethium, across cellulose triacetate membranes were determined by using mixtures of o-nitrophenyl n-octyl ether and quaternary ammonium salts as plasticizers, and 4-benzoyl-3-methyl-1-phenyl-5-pyrazolone (BMPP) and 4-trifluoroacetyl-3-methyl-1-phenyl-5-pyrazolone (TMPP) as carriers. The quaternary ammonium salts used were didodecyldimethyl-, distearyldimethyl-, tetrahexyl-, tetraoctyl-, and tetradecylammonium bromides [referred to as (C{sub 12}){sub 2}NBr, (C{sub 18}){sub 2}NBr, (C{sub 6}){sub 4}NBr, (C{sub 8}){sub 4}NBr, and (C{sub 10}){sub 4}NBr, respectively]. The effect of these ammonium bromides on the flux was demonstrated. For membranes containing 0.1 M (C{sub 12}){sub 2}NBr and (C{sub 18}){sub 2}NBr, BMPP exhibited considerably high fluxes. The fluxes of lanthanum and cerium using BMPP for (C{sub 12}){sub 2}NBr were higher than those of the other lanthanides. For the membranes containing 0.5 M (C{sub 12}){sub 2}NBr and 0.1 M (C{sub 18}){sub 2}NBr, however, no difference in flux among the lanthanides was observed. The fluxes using TMPP for (C{sub 12}){sub 2}NBr and (C{sub 18}){sub 2}NBr were very small, with the exception of some lanthanides. Appreciably high fluxes were observed for membranes containing 0.1 M (C{sub 6}){sub 4}NBr using BMPP. For (C{sub 8}){sub 4}NBr and (C{sub 10}){sub 4}NBr, BMPP exhibited low fluxes. For these membranes using TMPP, the lanthanides were scarcely transported. 13 refs., 5 figs., 2 tabs.
- Sponsoring Organization:
- USDOE
- OSTI ID:
- 171422
- Journal Information:
- Separation Science and Technology, Vol. 28, Issue 7; Other Information: PBD: May 1993
- Country of Publication:
- United States
- Language:
- English
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