Water adsorption in the organic phase for the D2EHPA–kerosene/water and aqueous Zn2+, Co2+, Ni2+ sulphate systems

Darvishi, D.; Haghshenas, Davoud Fatmehsari; Etemadi, Shahram; Alamdari, Eskandar Keshavarz; Sadrnezhaad, S.K.

doi:10.1016/j.hydromet.2007.02.010

Cited by 20 publications

(8 citation statements)

References 8 publications

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“…Therefore, it can be assumed that H + is not involved in the water adsorption equilibrium, and suggests that water will be joined by D2EHPA through hydrogen bonding. This conclusion was confirmed by Darvishi et al [17], who described the phenomenon of water adsorption by D2EHPA in the liquid-liquid extraction of the divalent metals in hydrometallurgical industry. The next stage of the study included the measurement of water content in the organic phase in contact with an aqueous solution of chromium(III).…”

Section: Resultssupporting

confidence: 63%

Synergistic extraction and separation of chromium(III) from acidic solution with a double-carrier supported liquid membrane

Rajewski

Religa

2016

Journal of Molecular Liquids

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Section: Resultssupporting

confidence: 63%

Synergistic extraction and separation of chromium(III) from acidic solution with a double-carrier supported liquid membrane

Rajewski

Religa

2016

Journal of Molecular Liquids

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“…As a reference, results obtained with 30 vol% D2EHPA are included. The results obtained here with D2EHPA are in good agreement with those of Darvishi et al 14 The addition of LIX 860‐I causes a shift of the extraction curve to lower pH‐values. This confirms the existence of a synergistic effect as would be expected from the results of the preceding experiments.…”

Section: Resultssupporting

confidence: 92%

Cobalt removal from waste‐water by means of supported liquid membranes

Verbeken

Vanheule

Pinoy

et al. 2008

J of Chemical Tech & Biotech

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BACKGROUND: Supported liquid membranes (SLM) are an alternative technique to remove and recover metals from diluted process solutions and waste-water. In the present work, the removal of Co(II) from a synthetic CoSO 4 solution containing initial amounts of cobalt(II) in the range 100-200 ppm (0.1-0.2 g dm −3 ) has been studied on a pilot scale. By performing batch equilibrium experiments, the optimal settings, i.e. the composition of the organic phase, the pH of the feed, the type and concentration of the stripping agent were determined.

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“…The water extraction and its influence on the stabilization of the aggregate core are often reported in the literature. 20,24,25,67,68…”

Section: Resultsmentioning

confidence: 99%

Colloidal Model for the Prediction of the Extraction of Rare Earths Assisted by the Acidic Extractant

et al. 2019

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We propose the statistical thermodynamic model for the prediction of the liquid–liquid extraction efficiency in the case of rare-earth metal cations using the common bis(2-ethyl-hexyl)phosphoric acid (HDEHP) extractant. In this soft matter-based approach, the solutes are modeled as colloids. The leading terms in free-energy representation account for: the complexation, the formation of a highly curved extractant film, lateral interactions between the different extractant head groups in the film, configurational entropy of ions and water molecules, the dimerization, and the acidity of the HDEHP extractant. We provided a full framework for the multicomponent study of extraction systems. By taking into account these different contributions, we are able to establish the relation between the extraction and general complexation at any pH in the system. This further allowed us to rationalize the well-defined optimum in the extraction engineering design. Calculations show that there are multiple extraction regimes even in the case of lanthanide/acid system only. Each of these regimes is controlled by the formation of different species in the solvent phase, ranging from multiple metal cation-filled aggregates (at the low acid concentrations in the aqueous phase), to the pure acid-filled aggregates (at the high acid concentrations in the aqueous phase). These results are contrary to a long-standing opinion that liquid–liquid extraction can be modeled with only a few species. Therefore, a traditional multiple equilibria approach is abandoned in favor of polydisperse spherical aggregate formations, which are in dynamic equilibrium.

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Water adsorption in the organic phase for the D2EHPA–kerosene/water and aqueous Zn2+, Co2+, Ni2+ sulphate systems

Cited by 20 publications

References 8 publications

Synergistic extraction and separation of chromium(III) from acidic solution with a double-carrier supported liquid membrane

Synergistic extraction and separation of chromium(III) from acidic solution with a double-carrier supported liquid membrane

Cobalt removal from waste‐water by means of supported liquid membranes

Colloidal Model for the Prediction of the Extraction of Rare Earths Assisted by the Acidic Extractant

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