SEPARATION OF RARE EARTH IONS La3+, Ce3+, Nd3+ By EMULSION LIQUID MEMBRANE

• Main Author: Nelza, Novia
• Format: Theses
• Language: Indonesia
• Subjects: Kimia
• Online Access: https://digilib.itb.ac.id/gdl/view/34165
• Institution: Institut Teknologi Bandung

Rare Earth Metals (REM) owning big potency for technology development. This research is learnt about usage of emulsion liquid membrane method to separate rare earth ions. Emulsion liquid membrane is used to separate La3+, Ce3+ and Nd3+ ions by using “D2EHPA” in the kerosene as carrier, and surfactant “span 80”- nitric acid admixture as internal phase or stripping agent. Optimum condition obtained when maximum wavelength of La3+,Ce3+ and Nd3+ are 557 nm, 537 nm and 538 nm respectively; concentration of surfactant (span 80) to dilute is 5 %(v/v) for La3+, Ce3+ and 4% (v/v) for Nd3+; carrier (D2EHPA) 4 %(v/v); volume ratio of internal phase to membrane phase(Vi :Vm) 1:1; optimum pH 3 (La3+ and Ce3+) and pH 2 (Nd3+); metallic solution concentration of La3+, Ce3+, and Nd3+ are 0.7199 mM, 0.7137 mM, and 0.6931 mM respectively; internal phase concentration 2 M; volume ratio of membrane phase to external phase (Vm :VE) 1:2, stirring speed of emulsion 2000 rpm (La3+, Ce3+) and 2500 rpm (Nd3+); stirring time of emulsion 10 minute (Ce3+) and 15 minute (La3+, Nd3+); speed of contact emulsion to external phase 700 rpm; contact time of emulsion to external phase 5 minute; hushet time of emulsion 10 minute; hushet time of emulsion after contact with external phase 5 minute (La3+, Nd3+) and 10 minute (Ce3+). Optimum condition is applied to artificial (synthetic) sample and natural sample. Separation of rare earth ions using emulsion liquid membrane method giving result which is pure enough. The purity of single artificial samples which measured by uv-visible spectrophotometer are La3+ 97,94%; Ce3+ 96,86 % and Nd3+ 97,08% while purity of those metals which measured with ICP-OES are 91.35%, 92,37 % and 94,20% respectively; by stripping value 13,70%, 44,99% and 40,34%. Separation of artificial sample admixture giving result relative equal purity. The purity obtained by using uv-visible spectrophotometer are sample (1) 98,75%; (2) 96,87% (3) 95,86% while using ICP-OES, the purity of La3+- Ce3+- Nd3+ are 77,55%; 99.10%; 94,98% respectively and by stripping value are 33,66%; 60,83%; 60,30% respectively. Similar treatment are applied to natural sample measured by uv- visible spectrophotometer which giving result which close to the artificial ones. The purity of Sample A (pH 2) is 96,87 % and sample B (pH 3) is 96,19 % while measured by ICP-OES giving each result La3+- Ce3+- Nd3+ are 57,56%; 59,15% ; 57,55% respectively and by stripping of La3+- Ce3+- Nd3+ are aqual to 94,26%; 87,28%; 91,29% respectively. Based on the result above, this methods 1s good enough for the separation of metal ions.