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Open AccessArticle

The Effect of Emulsifiers on the Emulsion Stability and Extraction Efficiency of Cr(VI) Using Emulsion Liquid Membranes (ELMs) Formulated with a Green Solvent

1
Laboratoire des Procédés Membranaires et des Techniques de Séparation et de Récupération, Département de Génie des Procédés, Université de Bejaia, Bejaia 06000, Algerie
2
Department of Chemical and Environmental Engineering, University of Oviedo, Julián Clavería 8, 33006 Oviedo, Spain
*
Author to whom correspondence should be addressed.
Membranes 2020, 10(4), 76; https://doi.org/10.3390/membranes10040076
Received: 30 March 2020 / Accepted: 18 April 2020 / Published: 21 April 2020
The stability of emulsion liquid membranes (ELMs) and their ability to extract Cr(VI) were investigated. The objective of this study is to compare different ELM formulations using combinations of two hydrophilic (Tween 20 and Tween 80) and two lipophilic (polyglycerol polyricinoleate (PGPR) and Span 80) emulsifiers. TOPO (tri-n-octylphosphine oxide) as a carrier and a green solvent (sunflower oil) were used to provide high extraction efficiency of Cr(VI). All these double emulsions were characterized in droplet size distribution, zeta potential, visual inspection with a microscope, and stability. The best formulation was obtained with PGPR as the inner stabilizer and Tween 80 as the outer stabilizer, leading to Cr(VI) ion removal efficiency of up to 96%. View Full-Text
Keywords: liquid membrane; double emulsion stability; chromium extraction; vegetable oil; PGPR liquid membrane; double emulsion stability; chromium extraction; vegetable oil; PGPR
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MDPI and ACS Style

Anarakdim, K.; Gutiérrez, G.; Cambiella, Á.; Senhadji-Kebiche, O.; Matos, M. The Effect of Emulsifiers on the Emulsion Stability and Extraction Efficiency of Cr(VI) Using Emulsion Liquid Membranes (ELMs) Formulated with a Green Solvent. Membranes 2020, 10, 76.

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