Flotation-separation of toxic metal ions from aqueous solutions using thiosemicarbazide derivatives as chelating agents and oleic acid as a surfactant

Ion Flotation of Copper(II) and Lead(II) from Environmental Water Samples

“…This may be attributed to the presence of insufficient amounts of surfactant required for complete flotation. At higher surfactant concentration the poor flotation is caused by the formation on the air bubble surface of a stable, hydrated envelope of surfactant or, perhaps, by forming a miscelle (Ghazy et al, 2004). Therefore, 3×10…”

“…2. Oleic acid begins to dissociated at pH ≥ 5 (Ghazy et al, 2004) and the presence of different forms of oleic acid determined by IR analysis at pH 9 (adjusted by NaOH) are13.2 % oleic acid, 68.2 % oleate and 18.2 % sodium oleate , in the form of soap [38]. Therefore, oleic acid can interact with the above complex systems (through hydrogen bonds, either by its un-dissociated or dissociated forms depending on the pH of the medium) according to the following schemes:…”

“…The combination of oleic acid surfactant with copper-HDPC or Pb-HDPC systems give hydrophobic sublates which float with the aid of air bubbles ( created inside the flotation cell by shaking ) to the solution surface solution (Ghazy et al, 2004).…”

Flotation separation of mercury(II) from environmental water samples using thiosemicarbazide derivatives as chelating agents and oleic acid as surfactant

“…The IR spectra of the isolated complexes from the float layers (after good washing) have no absorption bands corresponding to oleic acid. This means that oleic acid may combine with mercurythiosemicarbazide chelates through hydrogen bonds depending on the solution pH (Ghazy et al, 2004).…”

“…The combination of oleic acid surfactant with the mercury thiosemcarbazides gives hydrophobic aggregates that float with the aid of air bubbles (created inside the flotation cell by slight shaking) to the surface of the solution (Ghazy et al, 2004).…”