Selektifitas Transpor Lantanum Dari Mineral Monasit Dengan Teknik Supported Liquid Membrane

Djabal Basir
2009 unpublished
Abstrak. Telah dipelajari selektifitas transpor lantanum dari mineral monasit dengan teknik supported liquid membrane, SLM. Fasa membran digunakan membran pendukung PTFE (politetrafluoroetilen) yang direndam pada campuran carrier TBP (tributilfosfat) dan D2EHPA (asam di-2-etilheksilfosfat) dengan perbandingan konsentrasi tertentu dalam pelarut kerosen. Pemantauan konsentrasi unsur tanah jarang total dari waktu ke waktu dilakukan dengan metode spektrofotometri UV-Vis yang menggunakan NAS
more » ... gunakan NAS (natrium alizarin sulfonat) sebagai pewarna, pengukuran dilakukan pada panjang gelombang maksimum larutan simulasi unsur tanah jarang 534 nm. Penentuan konsentrasi masing-masing unsur tanah jarang tersebut dilakukan dengan metode ICP-AES, pada panjang gelombang emisi masing-masing unsur : Ce pada 418,66 nm; La pada 408,316 nm; Nd pada 401,225 nm; Gd pada 342,247 nm; dan Lu pada 261,542 nm. Kondisi optimum selektifitas transpor lantanum melalui SLM adalah pH fasa umpan 3,0; carrier TBP:D2EHPA (0,3:0,7) M; dan fasa penerima HCl 3,0 M. Pada kondisi ini faktor pemisahan unsur La terhadap Nd, Gd, Lu : α La,Nd 5,0297; α La,Gd 8,1935; α La,lu 11,9529. Penerapan kondisi optimum pada mineral monasit diperoleh kadar kemurnian lantanum yang berhasil ditingkatkan dari 25,08% pada proses sebelum SLM menjadi 89,84 % sesudah proses SLM, dengan % recovery adalah 84,15%. Kata kunci: supported liquid membrane, carrier, politetrafluoroetilen, tributilfosfat, asam di-2-etilheksilfosfat. Abstract. Transport selectivity of lanthanum from monazite mineral by supported liquid membrane, SLM technique has been studied. The supporting membrane, PTFE (polytetrafluoroethylene) was activated by immersing in a mixture of TBP (trybuthylphosphate) and D2EHPA (di-2-ethylhexyl phosphoric acid) at the composition of concentration in kerosene as carrier. Determination of the REE's total concentration was carried out by visible spectrophotometric with NAS (sodium alizarin sulfonat) as the colouring agent, absorbance of the solution was determinated at 534 nm as maximum wavelength. For the determination of REE,s specific concentration an ICP-AES has been adopted, at emission maximum wavelength in each specific of REE's, e.q : Ce at 418.66 nm, La at 408.316 nm, Nd at 401.225 nm, Gd at 342.247 nm, and Lu at 261.542 nm. Transport selectivity of lanthanum through SLM in a mixture of the REE's simulation by optimum condition were pH of feed phase was 3.0, concentration of carrier composition (TBP : D2EHPA) was (0.3 : 0.7) M, and concentration of chloride acid of the receiving phase was 3.0 M. In this condition, separation factor of La toward Nd, Gd, and Lu : α La,Nd 5.0297, α La,Gd 8.1935, α La,Lu 11.9529. Transport selectivity of lanthanum from monazite mineral through SLM at optimum condition have been resulted lanthanum with the perity rate of increase from 25.08% to 89.84%, with recovery was 84.15%.
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