Extraction and separation of gallium by solvent extraction with 5-nonyl-2-hydroxyacetophenone oxime: Fundamentals and a case study

Wakil, Azza F. El; Zaki, Salah A.; Ismaiel, Doaa A.; Salem, Hend; Orabi, Ahmed H.

doi:10.1016/j.hydromet.2023.106022

Cited by 4 publications

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“…The Vant Hoff equation established a relationship between the extraction constant (K ext ) and the temperature; however, a series of investigations used an approximation to the above in which the relation of the temperature is established with the distribution coefficient of the given element [ 14 , 15 , 16 , 17 , 18 ], as follows:

further, by plotting log D As versus 1/T it is possible estimate the value of the change in enthalpy and entropy associated with the corresponding system. Moreover, it was described that this expression can be used in systems when the given component exists in the system as more than one species [ 19 ].…”

Section: Resultsmentioning

confidence: 99%

“…It can be seen that the percentage of arsenic extraction decreased as the temperature increased, whereas in the case of sulfuric acid this percentage of extraction remained almost constant. The Vant Hoff equation established a relationship between the extraction constant (Kext) and the temperature; however, a series of investigations used an approximation to the above in which the relation of the temperature is established with the distribution coefficient of the given element [14][15][16][17][18], as follows:…”

Section: Influence Of the Temperaturementioning

confidence: 99%

“…The influence of the variation in the extractant concentration on arsenic(V) and sulfuric acid extraction was also investigated. In these experiments, aqueous solutions contained 1.5 g/L As(V) and 1.5 M H2SO4, whereas the organic phases were of 25-75% v/v Cyanex 923 in Solvesso 100 and undiluted Cyanex 923 (previously saturated with water to avoid changes in the volume of the solutions); the possibility of the practical use of this The Vant Hoff equation established a relationship between the extraction constant (K ext ) and the temperature; however, a series of investigations used an approximation to the above in which the relation of the temperature is established with the distribution coefficient of the given element [14][15][16][17][18], as follows:…”

Section: Influence Of the Extractant Concentrationmentioning

confidence: 99%

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Solvent Extraction with Cyanex 923 to Remove Arsenic(V) from Solutions

Alguacil,

Escudero,

Robla

2024

Molecules

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The removal of harmful arsenic(V) from aqueous solutions using Cyanex 923 (solvation extractant) was investigated using various experimental variables: equilibration time, the acidity of the aqueous phase, temperature, extractant and arsenic concentrations, and O/A ratio. Cyanex 923 extracted As(V) (and sulfuric acid) from acidic solutions; however, it could not be used to remove the metal from slightly acid or neutral solutions. The extraction of arsenic is exothermic and responded to the formation of H3AsO4·nL species in the organic phase (L represents the extractant, and the stoichiometric factor, n = 1 or 2, depends on the acidity of the aqueous phase). Extraction isotherms are derived from the experimental results. Both arsenic and sulfuric acid loaded onto the organic phase can be stripped with water, and stripping isotherms are also derived from the experimental results. The selectivity of the system against the presence of other metals (Cu(II), Ni(II), Bi(III), and Sb(III)) is investigated, and the ability of Cyanex 923 to extract As(V) and sulfuric acid compared to the use of other P=O-based solvation reagents, such dibutyl butylphosphonate (DBBP) and tri-butyl phosphate (TBP), is also investigated.

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