Optimization of lanthanum transport factors using supported ionic liquid membrane system

Transport of lanthanum by ionic supported liquid membrane was investigated. The system was prepared by immobilization of (TBP-[C4mim][Tf2N] and CMPO-[C4mim][Tf2N]) into hydrophobic PVDF membrane filter by using vacuum. Stripping phase was chosen as distilled water in TBP systems. For CMPO used systems stripping phase solution of EDTA was used. Lanthanum concentrations of samples were measured by ICP-OES. Modified full factorial design was used to optimize lanthanum transport efficiency factors as feeding phase metal initial concentrations, pH, carrier-ionic liquid ratio and CMPO concentration. Membrane characterization was carried out by means of SEM. After immobilization it was seen that the pores were filled up by organic liquid. Optimum conditions for lanthanum transport by TBP were initial lanthanum concentration 50 ppm, carrier-ionic liquid volume ratio 2:1 and pH 5.38% transport was achieved in these conditions. Optimum conditions for lanthanum transport by CMPO were initial lanthanum concentration 59,15 ppm, CMPO concentration 11,37 mM, pH 3.32% transport was achieved in these conditions. Additionally the most effected factor was found pH on transport of La (III) and there was no significant difference between TBP and CMPO extractants transport efficiency.