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ChemEngineering 2017, 1(1), 3; doi:10.3390/chemengineering1010003

Electrochemical Impedance Spectroscopy (EIS) Characterization of Water/Sodium Bis(2-Ethylhexyl) Sulfosuccinate-HDEHP/n-Dodecane Reverse Micelles for Electroextraction of Neodymium

1
Department of Civil & Environmental Engineering, Florida A&M University, Tallahassee, FL 32310, USA
2
Department of Chemical Engineering & Materials Science, University of California at Irvine, Irvine, CA 92697, USA
3
Department of Chemistry, University of California at Irvine, Irvine, CA 92697, USA
4
Department of Chemical & Biomedical Engineering, Florida A&M University, Tallahassee, FL 32310, USA
*
Author to whom correspondence should be addressed.
Academic Editor: Alírio Egídio Rodrigues
Received: 21 May 2017 / Revised: 10 June 2017 / Accepted: 19 June 2017 / Published: 23 June 2017
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Abstract

The extraction and separation of metal ions in the lanthanide series using the liquid-liquid extraction (LLX) technique poses a major challenge due to the chemical similarities of the metals and hence interest exists in devising a technique to improve the separation factor. In this work, sodium bis(2-ethylhexyl) sulfosuccinate (AOT) is explored for improved organic phase conductivity to aid the use of an imposed external field to improve the LLX. The electrochemical impedance spectroscopy (EIS) technique was used to determine the effect of molar water content, AOT and HDEHP (bis(2-ethylhexyl) phosphoric acid) concentration, and the temperature on the reverse micelle solution conductivity. Results showed that as AOT concentration and water content increases, conductivity increases until the reverse micelles collapse. The addition of HDEHP caused a significant drop in solution conductivity. For a mixed AOT and HDEHP system and at a small applied external field range of 0–1.4 kV m−1 and 60 rpm stir rate, a significant improvement in Nd extraction was observed relative to the traditional LLX using HDEHP only. With AOT only, a 40% improvement in extraction was observed with applied field relative to the absence of field. Cost consideration favors the use of mixed AOT and HDEHP at a slow stir rate for improved Nd extraction. View Full-Text
Keywords: electrochemical impedance spectroscopy; reverse micelles; AOT; liquid-liquid extraction; neodymium; electroextraction electrochemical impedance spectroscopy; reverse micelles; AOT; liquid-liquid extraction; neodymium; electroextraction
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Anderson, S.; Nilsson, M.; Kalu, E.E. Electrochemical Impedance Spectroscopy (EIS) Characterization of Water/Sodium Bis(2-Ethylhexyl) Sulfosuccinate-HDEHP/n-Dodecane Reverse Micelles for Electroextraction of Neodymium. ChemEngineering 2017, 1, 3.

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