Carrier facilitated transport of uranium across supported liquid membrane using dinonyl phenyl phosphoric acid and its mixture with neutral donors

Carrier facilitated transport of U(VI) from nitric acid medium across supported liquid membrane (SLM) has been studied under varying experimental conditions, namely feed, carrier, receiver phase compositions, pore size and membrane thickness etc. Microporous polytetrafluoroethylene (PTFE) membranes...

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Bibliographic Details
Published in:Desalination 2012-03, Vol.290, p.74-82
Main Authors: Biswas, Sujoy, Pathak, P.N., Roy, S.B.
Format: Article
Language:English
Subjects:
Applied sciences
Chemical engineering
citric acid
desalination
DNPPA
Exact sciences and technology
liquid membranes
Membrane
Membrane separation (reverse osmosis, dialysis...)
nitrates
nitric acid
oxalic acid
permeability
Permeation
phosphoric acid
Pollution
Synergism
Uranium
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Summary:Carrier facilitated transport of U(VI) from nitric acid medium across supported liquid membrane (SLM) has been studied under varying experimental conditions, namely feed, carrier, receiver phase compositions, pore size and membrane thickness etc. Microporous polytetrafluoroethylene (PTFE) membranes were used as a solid support and dinonyl phenyl phosphoric acid (DNPPA) either alone or in combination with neutral donors dissolved in n-paraffin was used as carrier. Receiver phases like H2SO4, Oxalic acid, Citric acid and Na2CO3 were evaluated. 2M H2SO4 appeared to be most effective as receiver for U(VI) transport across SLM under the conditions of these studies. The permeability coefficient (P) evaluated for 0.1M DNPPA in combination with 0.05M neutral donors showed the U(VI) transport order: Cyanex 923~TOPO>TBP>TEHP. The permeability (P) of U(VI) decreased with increase in HNO3 concentration and with metal ion concentration in feed solution. The variation of Cyanex 923 concentration at fixed DNPPA concentration (0.1M) revealed that U(VI) permeation across SLM was maximum at 1:2.5 mole ratio. The synergistic mixture of 0.1M DNPPA+0.05M Cyanex 923 was used for uranium recovery from uranyl nitrate raffinate (UNR) solution. [Display omitted] ► Permeation of U(VI) from nitric acid medium across supported liquid membrane. ► DNPPA without/with Cyanex 923, TOPO, TBP, and TEHP in n-paraffin as carriers. ► U(VI) permeation increased in the order: Cyanex 923~TOPO>TBP>TEHP. ► U(VI) permeation across SLM maximum at 1:2.5 mole ratio of DNPPA and Cyanex 923. ► Relevant for uranium removal from nitric acid waste solutions emanating from process plants/analytical labs.
ISSN:0011-9164
1873-4464
DOI:10.1016/j.desal.2012.01.006