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Development of Novel and Effective Methods for the Extraction of Neodymium Using Sodium Bis(2-Ethylhexyl) Sulfosuccinate Reverse Micelles
Başlık:
Development of Novel and Effective Methods for the Extraction of Neodymium Using Sodium Bis(2-Ethylhexyl) Sulfosuccinate Reverse Micelles
Yazar:
Anderson, Shannon Patrice, author.
ISBN:
9780438033085
Yazar Ek Girişi:
Fiziksel Tanımlama:
1 electronic resource (94 pages)
Genel Not:
Source: Dissertation Abstracts International, Volume: 79-10(E), Section: B.
Advisors: Clayton J. Clark II; Egwu E. Kalu Committee members: Tarek Abichou; Gang Chen; Edith Onyeozili.
Özet:
The anionic surfactant bis(2-ethylhexyl) sulfosuccinate (AOT) effects on extraction of Nd from aqueous phase in a liquid-liquid and electric field-imposed extraction processes were studied and comparison of the relative Nd extractions evaluated. Results showed that with AOT alone (absence of HDEHP), the Nd extraction was affected by both the initial Nd concentration and the ionic strength value of the extraction mixture. With an initial Nd concentration above 12 mM at a value of 1.0 ionic strength, a third phase formed in the solution and greater than 90% of Nd in the aqueous phase was extracted and distributed between the organic and the solid third phase. Above ionic strength value of 1.0, the Nd percentage extraction decreased. In the presence of HDEHP, the relative extraction of Nd (Nd extracted with AOT+HDEHP mixture vs. Nd extracted with HDEHP only) was affected mostly by the stir rate. The relative extraction of Nd increased with decreasing stir-rate leading to over a 500% relative increase in extraction at a stir-rate of 0 rpm. The effect of AOT concentration to the increase in relative extraction was marginal. With the application of an external electric field (0 -- 1.4 kV m-1) at a stir rate of 60 rpm, a slight to moderate increase in the extraction of Nd was observed relative to the Nd extracted without applied field for AOT, AOT+HDEHP and HDEHP only. Electrochemical impedance spectroscopy (EIS) technique was used to determine the effect of molar content of water (W o), AOT and HDEHP concentration, and temperature on the reverse micelle solution conductivity. As Wo increased, conductivity increased until the reverse micelles collapsed. Addition of HDEHP caused a significant drop in solution conductivity. Temperature had a mild effect on increasing the conductivity.
Notlar:
School code: 0872
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