Supported liquid membrane extraction study of (MoO sub 4 ) sup 2 minus ions using tri-n-octylamine as carrier

Journal Article · Wed Jul 01 04:00:00 EDT 1992 · Separation Science and Technology; (United States)

DOI:https://doi.org/10.1080/01496399208019028· OSTI ID:5158477

Chaudry, M A; Ahmed, B ^[1]

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1. Pakistan Inst. of Nuclear Science and Technology, Islamabad (Pakistan)

The transport of (MoO{sub 4}){sup 2{minus}} ions across a tri-n-octylamine (TOA) xylene-based supported liquid membrane has been studied at various HCl concentrations in the feed, TOA concentrations in the membrane, and NaOH concentrations in the strip solution. The distribution coefficient and flux of the Mo(VI) ion species vary with the HCl concentration, indicating that different polymeric species of this metal ion are present in the aqueous solution. A TOA concentration increase of up to 1.308 mol/dm{sup 3} enhances flux and permeability of this metal ion, which beyond this concentration is reduced due to an increase in carrier liquid viscosity. An increase in NaOH solution concentration has been found to increase flux and permeability values. The continuous increase in pH of the feed with the transport of metal ions indicates that the (MoO{sub 4}){sup 2{minus}} transport does not involve a decrease or increase in concentration as a result of association of lower to higher or decomposition of higher to lower metal ions polymeric species. The optimum conditions of transport of Mo(VI) metal ions across these membranes have been found to be HCl = 0.01, (NaOH) = 1, and (TOA) = 1.308, furnishing flux and permeability values of the order of 2.49 {times} 10{sup {minus}4} mol{center dot}m{sup {minus}2}/s and 2.32 {times} 10{sup {minus}10} m{sup {minus}2}/s, respectively.

• OSTI ID: 5158477
• Journal Information: Separation Science and Technology; (United States), Journal Name: Separation Science and Technology; (United States) Vol. 27:8-9; ISSN SSTED; ISSN 0149-6395
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400105* -- Separation Procedures
ALKALI METAL COMPOUNDS
ALKYLATED AROMATICS
AMINES
AROMATICS
CARRIERS
CHLORINE COMPOUNDS
COMPLEXES
DATA
EXPERIMENTAL DATA
HALOGEN COMPOUNDS
HYDROCARBONS
HYDROCHLORIC ACID
HYDROGEN COMPOUNDS
HYDROXIDES
INFORMATION
INORGANIC ACIDS
MEMBRANE TRANSPORT
MEMBRANES
MOLYBDATES
MOLYBDENUM COMPOUNDS
NUMERICAL DATA
OPTIMIZATION
ORGANIC COMPOUNDS
OXYGEN COMPOUNDS
PERFORMANCE TESTING
PERMEABILITY
PH VALUE
QUANTITY RATIO
REFRACTORY METAL COMPOUNDS
SODIUM COMPOUNDS
SODIUM HYDROXIDES
SUPPORTED LIQUID MEMBRANES
TESTING
TRANSITION ELEMENT COMPOUNDS
VISCOSITY
XYLENES