Interfacial activity of 1-(2′-hydroxy-5′-methylphenyl)-dodecane-1-one oxime and the interfacial mechanism of copper extraction
The interfacial tension isotherms for pure 1-(2′-hydroxy-5′-methylphenyl)-dodecane-1-one oxime at toluene/water and octane/water interfaces were determined and interpreted. The surface excess was calculated according to the Gibbs, Szyskowski and Temkin isotherms and the third order polynominal and used to predict reaction orders against hydroxyoxime for different mechanism versions of copper extraction from acidic sulphate solutions. The obtained results support the interfacial mechanism of copper extraction with the formation of stable 2:1 complex from intermedate 1:1 compelex and the hydroxyoxime molecule present in the aqueous layer near the interface as the slowest step.
Key wordsHydroxyoxime copper extraction
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