Permeabilitas Membran Transpor Campuran Unsur Tanah Jarang (La, Nd, Gd, Lu) Menggunakan Carrier (TBP : D2EHPA) Melalui Supported Liquid Membrane
ABSTRACT: Methods that have
been developed currently for the separation and purification of rare earth
elements, REE’s are solvent extraction by through immobilization of an
extracting agent in a porous polymeric membrane. This methods beside could
increase the transport selectivity, also the amount of carrier was very few.
This technique is known as supported liquid membrane, SLM. Research toward
transport and separation of REE’s through SLM have been still relatively
limited merely to single feed-binary mixture, and one type of carrier. The
transport membrane permeability was obtained
in a mixture of REE’s (La,Nd,Gd,Lu) using the carrier TBP : D2EHPA by SLM. In
this SLM technique, supporting membrane PTFE (polytetrafluoroethylene) was
soaked in a mixture of TBP carrier (tributilfosfat) as a neutral ligand and
D2EHPA (acid-2- etilheksilfosfat) as anionic ligand with a particular
concentration ratio in the solvent kerosene as membrane phase. HCl as receiver
phase and solution mixture of REE’s as feed phase. Determination of the REE’s
total concentration was carried out by UV-Vis spectrophotometry with NAS
(sodium alizarin sulfonate) as the colouring agent at pH 4,75 and the solution
absorbance was determinated at 534 nm as maximum wavelength. Transport patterns
of REE’s on the variation of the concentration of total mixed carrier composition,
pH, and concentration of the receiver
phase were done for 300 minutes. The optimum conditions of transport mixture of
REE’s (La, Nd, Gd, Lu) were feed phase pH 3,0; carrier TBP: D2EHPA (0,3:0,7) M;
and receiver phase HCl 3,0 M. In this condition, the transport membrane
permeability in mixture of REE’s was 0,1077 cm.menit-1 with the percent of
transport was 95,24%.
Penulis: Djabal Nur Basir
Kode Jurnal: jpkimiadd150702
