Abstract
ABSTRACT Cerium, a rare-earth element, is very important in industry and technology. It has particular applications in catalytic processes, hydrogen storage, lighting and polishing. The extraction of cerium ions can be carried out easily with solvent and membrane extraction processes from an aqueous medium. The process for the removal of cerium ions in a liquid membrane stabilised on the polytetrafluoroethylene (PTFE) was examined with the presence of imidazolium ionic liquid and organophosphorus extractants. The outcomes demonstrated that ionic liquid improves the extraction procedure and increases the permeation coefficient through the supported liquid membrane (SLM) membrane. The impact of process parameters such as the acidity of feed and recovery phase and concentration of carriers were investigated, and the maximum permeation coefficient was observed at 30%, 20% and 10% v/v for D2EHPA, TBP and C6MIM.NTF2 extractant concentrations, respectively, and cerium ions of 200 mg/L, feed pH of 6 and 2 M for the acidity of the stripping phase. Also, the resistances of both phases were modelled and calculated with the consideration of the rapid reaction in the interface with the first-order reactions.
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