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Abstract
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A new supported liquid membrane (SLM) was designed by using a suitable deep eutectic
solvent (DES) as hydrophobic liquid membrane phase for the selective and facilitated carrierless
transport of Ag+ ion. The deep eutectic solvent was composed of a 4/1 molar ratio of lmenthol/
salicylic acid which was impregnated into a microporous polypropylene membrane
to prepare a novel carrier-less SLM system. The highly selective facilitated transport of silver
ion was accomplished by using sodium thiosulfate as a highly selective stripping agent for
Ag+ ion in the aqueous strip phase (SP). Some important factors, including concentration of
picric acid in the Feed phase (FP), pH of the two aqueous phases, stirring rate, transport time,
and nature and concentration of stripping agent were also investigated and optimized. In the
presence of 2.8 × 10-2 mol/L, picrate ion as an appropriate ion pairing agent in the FP, 0.025
mol/L thiosulfate as a convenient metal ion acceptor in the SP, the amount Ag+ ion transport
was found to occur almost quantitatively after 60 min is 90%. (Comment 1, Referee 2)
Compared with other SLM systems reported in the literature, the designed DES-SLM system
exhibited suitable permeability and higher selectivity for Ag+ ion transport from aqueous
solutions containing Fe2+
, Mn2+, Cu2+, Ni2+, Pb2+, and Cd2+ as competing metal ions.
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