Alguacil, F.J.; Escudero, E.; Robla, J.I. Solvent Extraction with Cyanex 923 to Remove Arsenic(V) from Solutions. Molecules2024, 29, 470.
Alguacil, F.J.; Escudero, E.; Robla, J.I. Solvent Extraction with Cyanex 923 to Remove Arsenic(V) from Solutions. Molecules 2024, 29, 470.
Alguacil, F.J.; Escudero, E.; Robla, J.I. Solvent Extraction with Cyanex 923 to Remove Arsenic(V) from Solutions. Molecules2024, 29, 470.
Alguacil, F.J.; Escudero, E.; Robla, J.I. Solvent Extraction with Cyanex 923 to Remove Arsenic(V) from Solutions. Molecules 2024, 29, 470.
Abstract
The removal of harmful arsenic(V) from aqueous solutions using Cyanex 923 (solvation extractant) was investigated under various experimental variables: equilibration time, acidity of the aqueous phase, temperature, extractant and arsenic concentrations, and O/A ratio. Cyanex 923 extracted As(V) (and sulphuric acid) from acidic solutions, thus, its use to remove the metal from slightly acid or neutral solutions it is not possible. Extraction of arsenic is exothermic, and responded to the formation of H3AsO4·nL species in the organic phase (L represented the extractant and the stoichiometric factor n: 1 or 2, depends on the acidity of the aqueous phase). Extraction isotherms are derived from experimental results. Both arsenic and sulphuric 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), Sb(III)) are investigated, and also it is investigated the ability of Cyanex 923 to extract As(V) and sulphuric acid against the use of other P=O based solvation reagents, such dibutyl butylphosphonate (DBBP) and tri-butyl phosphate (TBP).
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